013042   Deshmukh M B;Anbhule P V;Jadhav S D;Jagtap S S;Patil D R;Salunkhe S M;Sankpal S A (Chemistry Dep, Shivaji Univ, Kolhapur-416 004, Email: anbhule@indiatimes.com) : Novel and environmental friendly, one-step synthesis of 2,6-Diamino-4-phenyl pyrimidine-5-carbonitrile using potassium carbonate in water. Indian J Chem-Sect B 2008, 47(5), 792-5.

A green, simple and environmentally friendly approach has been carried out towards one-step synthesis of 2,6-diamino-4-phenyl pyrimidine-5-carbonitrile by three-component condensation of aromatic aldehydes, malononitrile and guanidine hydro-chloride in aqueous medium using potassium carbonate and in the presence of tetrabutyl ammonium bromide.

2 shet, 1 table, 22 ref

013041   Dangi R;Sharma A;Sharma J C;Bhardwaj S (Chemistry Dep, M.P. Govt. P.G. College, Chittorgarh) : Degradation of methyhlene blue using ZnS-CdS as photocatalyst. Int J chem Sci 2008, 6(1), 197-204.

The bleaching of methylene blue was carried out in presence of semiconductor ZnS-CdS. The source used for energy was visible light. Effect of various parameters like amount of semiconductor, pH, light intensity, dye concentration etc. were varied on the rate of bleaching was observed. A tentative mechanism has been proposed.

5 illus, 5 tables, 7 ref

013040   Coumar M S;Jindal D P;Brum G;Massarelli P; Singh R;Sharma A K;Nandakumar K;Bodhankar S L (Biotechnology and Pharmaceutical Research Div, National Health Research Institute, 35, Keyan Road, Zhunan Town, Miaoli County 350, Taiwan, Email: mohanecl@yahoo.co.in) : Synthesis, β-adrenergic receptor binding and antihypertensive potential of vanillin-derived phenoxypropanolamines. Indian J Chem-Sect B 2008, 47(6), 903-9.

Synthesis of vanillin-derived phenoxypropanolamines is carried out by condensing 4-hydroxy-3-methoxybenzaldchyde (vanillin) 1 with epichlorohydrin, followed by treatment with iso-propylamine or tert-butylamine to open the epoxy ring. Percentage inhibition of [³H]dihydroalprenolol binding to both β₁ and β₂- adrenergic receptors by the newly synthesized compounds is assessed in vitro using turkey erythrocyte membrane (β₁) and lung homogenate of rats (β₂). Formyl derivatives 8 and 9 showed maximum inhibitory effect in binding assay and are non-selective similar to propranolol. On the other-hand, aldoxime compounds 10 and 11 have preference for β₁-adrenergic receptors similar to atenolol. Also four of the compounds 8-1.1 are evaluated for their anti-hypertensive potential, in left renal artery ligation and fructose induced hypertension models. 4-(3-/erC-Butylamino-2-hydroxy-propoxy)-3-methoxy-benzaldehyde oxime 11 shows antihypertensive effect better than propranolol.

3 illus, 1 table, 10 ref

013039   Chen W T;Li X F;Luo Q Y;Xu Y P;Liu D S (School of Chemistry and Chemical Engineering. Jiangxi Province Key La, Jinggangshan Univ, Jian, Jiangxi 343009, China, Email: wtchen_2000@yahoo.cn) : Hydrothermal synthesis, crystal structure and strong photoluminescence of [Er(C₆NO₂H₅)₂(H₂O))_4(NO3).2NO3. Indian J Chem-Sect A 2008, 47(9), 1369-72.

The hydrothermal reaction of erbium nitrate with isonicotinic acid affords the erbium complex [Er(C₆NO₂H₅)₂ (H₂O)₄(NO₃)]-2NO₃, which has been structurally characterized by X-ray diffraction. The title complex is characteristic of an isolated structure based on one discrete [Er(C₆NO₂H₅)₂(H₂O)₄(NO₃)] ²⁺ moiety and two isolated nitrate anions. The [Er(C₆NO₂H₅)₂(H₂O)₄(NO₃)] ²⁺ moieties and the nitrate anions are interconnected via hydrogen bonds to form a two-dimensional supramolecular network. Photoluminescent investigation reveals that the title complex displays a greenish yellow emission band and a red emission band. The greenish yellow emission band is stronger than that of the red emission band. The greenish yellow and red emission bands are identified as the Er³⁺ transitions from the ²H_4/2, ⁴S_3/2 and ⁴F₉₂ levels to the ⁴I_15/2 ground state.

2 illus, 1 table, 10 ref

013038   Chen O B;Luo I T;Yang X (Institute of Applied Chemestry, Nanchang Univ, Nanchang 330031, P.R. of China) : Partial oxidation of methanol on Au-Pd/ceria. Indian J Chem-Sect A 2008, 47(9), 1317-22.

Partial oxidation of methanol over Au/CeC₂ and Au-Pd/CeO₂ catalysts is reported here. The catalysts have been characterized by using X-ray diffraction, temperature programmed reduction and temperature-programmed desorption of methanol. The studies show that the Au-Pd alloy particles are formed, and Au dispersion on CeO₂ support is promoted owing to the addition of Pd to the Au-Pd/CeO₂ bimetallic catalyst. Compared with Au/CeO₂ catalyst, the Au-Pd/CeO₂ catalyst has larger active surface area and stronger interaction between Au-Pd and support. The desorption temperature of methanol is low. The Au-Pd/CeO₂ catalyst reduced by H₂ before the reaction shows higher methanol conversion and hydrogen selectivity, which suggests that the metallic states of Au, Pd and Au-Pd play an important role in the partial oxidation of methanol.

6 illus, 27 ref

013037   Chaurasia L;Verma R K (Building Pests and Mycology Laboratory, Environmental Science and Tech, Central Building Research Institute, Roorkee-247 667, Email: cleena@in.com ) : Fungicidal potency of pyrazolo derivatives: N1 - nicotinoyl -4' -(sulpha/substituted phenylazo) -1, 2-diazol-4, 6 dimethyl pyrimidine-5-one. Biozone 2009, 1(1), 92-7.

Series of fused heterocycle pyrazolo pyrimidine, namely N¹ - Nicotinoyl -4'-(Sulpha/substituted phenylazo) -1,2-diazol-4,6 dimethyl pyrimidine-5-one has been synthesized. The compound have been screened for antifungal activity against building fungi. Aspergillus flavus and Penicillium granulatum were used for evaluating fungicidal activity of a compound during the study. It was found that out of 29 compounds thirteen have shown significant fungicidal activity against both the above species. Minimum Inhibition Concentration (MIC) was observed between 100-200 ppm for most of the compounds.

1 table, 21 ref

013036   Bollikolla H B;Satyanarayana Peruri V V (Chemistry Dep, Acharya Nagarjuna Univ, Nnagar-522 510, Email: chemperuri@yahoo.co.in) : Configuration and conformational analysis of some substituted 2-aryl-trans-decahydroquinolin-4-ols by proton NMR spectroscopy. Int J pure appl Chem 2008, 3(1), 57-63.

The conformational analyses of some different substituted 2-aryl-trans-decahydro-quinolin-4-ols were studied by using 1H NMR spectral data. The spectral data indicated that the compounds predominantly exist in twin chair conformation and the fusion of the decalin ring system is trans. The coupling constants between the vicinal protons were used to assign the conformations of these compounds. The aryl group present at C-2 and the alkyl group present at C-3 were assigned to occupy equatorial position. The signals for N-H protons could not identified due to faster exchange of protons.

4 illus, 6 tables, 24 ref

013035   Bhartiya S K;Roy J (Physics Dep, Inter College, B.M.P.-7, Katihar-854 105) : Solid state kinetics of some metal chelates of macro organic ligands. Int J chem Sci 2008, 6(2), 1111-14.

Thermogravimetric analysis was used to determine kinetic parameters such as order of reaction, activation energy, frequency factor etc. of some metal complexes based on the method of Freeman and Carroll.

6 ref

013034   Bhagat P R (Chemistry Dep, Jawaharlal Darda Institute of Engg. & Technology, Lohara, Amravati Road, Yavatmal-445 001, Email: prbhagat111@rediffmail.com) : Microwave synthesis of 1- carboxamido-3,5-diaryl-Δ² pyrazolines.. Int J chem Sci 2008, 6(1), 122-6.

Prop-2,3-en-1-one (Chalcones) (la-h) were obtained by condensation of aromatic aldehydes with acetophenone in alkaline medium, which on microwave irradiation with semicarbazide hydrochloride give 1- carboxamido-3, 5- diaryl -Δ²-Pyrazolines (2a-h). The structures of these compounds were established by elemental, chemical and spectral analysis (IR, NMR). The properties of these compounds are found to be similar to the compounds obtained by usual methods.

1 sch, 1 table, 17 ref

013033   Bhagat P R (Chemistry Dep, Jawaharlal Darda Institute of Engg. and Technology, Lohara, Amravati Road, Yavatmal-445 001, Email: prbhagat111@rediffmail.com) : Microwave assisted synthesis of 1-(3 -chlorophenyl)-3, 5-diaryl-pyrazoles. Int J chem Sci 2008, 6(1), 68-7.

Esterification of substituted acetophenone with aromatic acids followed by B.V. transformation gives β - diketone, which on microwave irradiation with m-chlorophenyl hydrazine hydrochloride give l-(3-chlorophenyl)-3,5-diaryl-pyrazoles (2a-f). The structures of these compounds were established by elemental, chemical and spectral analysis (IR, NMR). The properties of these compounds are found to be similar to the compounds obtained by usual method.

1 sch, 1 table, 10 ref

013032   Basavaiah K;Anil Kumar U R;Tharapa K (Chemistry Dep, Mysore Univ, Manasagangotri, Mysore-570 006, Email: basavaiahk@yahoo.co.in) : New HPLC method for the quantification of pantoprazole in pharmaceuticals. Int J chem Sci 2008, 6(2), 579-86.

A new analytical method is developed and appropriately validated by means of a high performance liquid chromatography (HPLC) in reverse phase to quantify pantoprazole in pharmaceutical preparations. The HPLC determination was performed on a reversed phase column (Inertsil ODS 5μm; 150 x 4.6 mm i.d) using a mobile phase (0.6 mL min^-1 ) with UV-detection at 289 nm. A rectilinear relationship between mean peak area and concentration of PNT was observed in the range 25-200 (.ig mL^-1 with a detection limit of 6.0 μg mL^-1 and a quantitation limit of 20.0 μg mL^-1. Intra-day and inter-day precision, and accuracy of the methods have been established according to the current ICH guidelines. The results were statistically compared with those of the reference method by applying Student's t-test and F-test. Accuracy, evaluated by means of the spike recovery method was in the range <)7.7-l02.2%, with precision (RSD) better than 2%.

2 illus, 3 tables, 11 ref

013031   Barua A;Das P J (Chemistry Dep, Gauhati Univ, Guwahati-781 014, Email: pjd123@sify.com) : Solvent free diacetylation of aldehydes using a solid acid under microwave irradiation and simple route to their regeneration. Indian J Chem-Sect B 2008, 47(6), 938-41.

A simple solvent-free microwave mediated procedure for the selective protection of aldehydes by conversion to their 1,1-diacetates is reported. The resultant diacetates were deprotected to generate the aldehyde using aqueous formic acid in the presence of a surfactant in high yield.

1 sheet, 2 tables, 22 ref

013030   Bapna A;Sain D K;Talesara G L (Synthetic Organic Laboratory, Chemistry Dep, M.L. Sukhadia Univ, Udaipur-313 001, Email: gtalesara@yahoo.com) : Synthesis and characterization of some new alkoxyphthalimide derivatives of benzimidozolylthiazolidinones. Res J Chem Envir 2008, 12(4), 24-8.

Reaction of o-phenylenediamine and p-aminobenzoic acid in 1N HCl afforded 2-(4-aminophenyl)-1H-benzimidazole (1), which readily underwent condensation reaction with benzaldehyde to yield schif's base (2). Cyclization of (2) by refluxing with mercaptoacetic acid in DMF furnished 3-[4-(1H-benzimidazol-2-yl)phenyl]-2-phenyl-l,3-thiazolidin-4-one (3). Compound (3) on treatment with various aromatic aldehydes gave corresponding arylidene derivatives (4a-d). Subsequently compounds (4a-d) were converted to corresponding 3-[4-(lH-benzimidazol-2-yl)phenyl]-l-N-ethoxyphthalimido-5-(arylidene) -2-phenyl-l,3-thiazolidin-4-one (5a-d) by treatment with phthalimidoxyethyl bromide. The structures of synthesized compounds have been assigned on the basis of elemental analysis deriv and spectral data.

1 table, 42 ref

013029   Bansal D;Manmohan;Mittal R K (Chemistry Dep, Rajasthan Univ, Jaipur-302 004) : Reactions of hexabutylditin with tertiary amines. Res J Chem Envir 2008, 12(4), 84.

The reactions of hexabutylditin with tertiary amine in molar ratios of 1:2 were studied in the medium of anhydrous chloroform or benzene. Complexes of the type [R₃Sn]₂2NR₃ (where R= Et, Bu and Ph) have been synthesized. In these reactions it was observed that two molecules of the lig and form adducts. The resulting adducts were obtained in the form of yellow liquid or grey solid. They are soluble in common organic solvents. The conductivity measurements do not support their ionic nature. These adducts appear to be five coordinated and structure may be trigonal bipyramidal.

1 table, 6 ref

013028   Bairwa B S;Agarwal H;Sharma I K;Varshney S; Verma P S (Chemistry Dep, Rajasthan Univ, Jaipur-302 004, Email: psvermajaipur@yahoo.com) : Electrochemical reduction of Zn (II) l-amino acids system in aqueous formamide mixture A T D. M. E.. Int J chem Sci 2008, 6(1), 17-28.

Kinetic parameters of Zn (II) in presence of ligand 1-lysine, 1-aspartic acid, 1-glutamic acid, 1-arginine, 1-tryptophan and 1-tyrosine at pH 7.50 ± 0.02 and at constant ionic strength μ = 0.1 NaClO₄ have been evaluated. The reductions in all these cases were found to be quasi reversible and diffusion controlled. The values of kinetic parameters for the electrode processes viz a, A, and k_s have been evaluated using Geiling's treatment¹ and E^r_1/2 values were also calculated for quasi reversible electrode processes.

30 illus, 1 table, 20 ref

013027   Badami B V (NO, , H.No. 80 (Upstairs), 1st Main, 3rd Cross, Narayanpur, Dharwad-580 008) : Concept of green chemistry, redesigning organic synthesis. Resonance 2008, 13(11), 1041-8.

Green chemistry is the utilization of a set of principles that will help reduce the use and generation of hazardous substances during the manufacture and application of chemical products. Green chemistry aims to protect the environment not by cleaning up, but by inventing new chemical processes that do not pollute. It is a rapidly developing and an important area in the chemical sciences. Principles of green chemistry, developments in this field and some industrial applications are discussed.

6 ref

013026   Atsu Barku V Y;Opoku-Boahen Y;Kugbee A B;Amoh M;Darko A (Chemistry Dep, School of Physical Sciences, Cape Coast Univ, Cape Coast, Email: atsubarku@yahoo.com) : GC analysis of methanol in locally distilled alcoholic beverage "akpeteshie" in Ghana. Int J pure appl Chem 2007, 2(2), 259-61.

A local alcoholic beverage in Ghana called "akpeteshie" is distilled from palm wine and cane sugar. Akpeteshie is the most commonly patronage alcoholic beverage in Ghana. A generalized gas chromatography with Thermal Conductivity Detector (TCD) has been used to directly determined methanol content in the alcoholic beverages sampled from Cape Coast. Recovery studies conducted led to the recoveries of 98.7% to 100.0%. The method was found to display high precision and accuracy from the repeated and reproducibility analyses carried out in the range of concentrations (10-50μl/l). The locally distilled alcoholic beverages cane sugar and palm wine were found to have contained some amount of methanol with the % concentrations 0.1568±0.067 and 0.1114±0.0011, respectively. However, methanol levels in the industrially distilled alcoholic beverages namely; paramount gin, dollar gin and boost whisky, were found below the detection limit.

3 tables, 9 ref

013025   Ansari F B;Mansoor F;Quadri S H (Rizvi College of Arts, Sci. and Com., Carter Road, Bandra (W) Mumbai-400 050) : Potentiometric determination of stability constants of transition metal complexes with p-aminobenzoic acid. Int J chem Sci 2008, 6(2), 873-7.

The stability constants of complexes of metals (Mg, Ni and Co) with p - aminobenzoic acid was determined by potentiometric methods by keeping 1 : 1, 1 : 2, 1 : 5 and 2 : 3 molar ratios. The results are analysed for their stabilities.

1 table, 5 ref

013024   Amutha C;Saravanan S;Dhandapani P S; Muthusubramanian S;Sivasubramanian S (School of Chemistry, Madurai Kamaraj Univ, Madurai-625 021, Email: methumanian2001@yahoo.com) : Efficient solventless synthesis of α-aryl-N-[1-methyl-2-(2/4-chlorophenyl)]ethyl nitrones and their antimicrobial actity. Indian J Chem-Sect B 2008, 47(2), 276-82.

An efficient solventless synthesis of α-aryl-N-[1-melhyl-2-(2/4-chlorophenyl)]ethyl nitrones has been achieved in excellent yield. The compounds are characterized by NMR and X-ray studies. The antimicrobial activities of the synthesized compounds have also been investigated.

2 illus, 2 tables, 12 ref

013023   Ahmed S M (Chemistry Dep, Faculty of Science, Assiut Univ, 71516, Agypt, Email: sm_ahmed@yahoo.com) : Chromogenic energy of poly(o-anisidine) vanished via oxidative hydrolysis mechanism. Int J pure appl Chem 2007, 2(1), 67-75.

Chromogenic energy (CE) of poly(o-anisidine) doped with different acids (HA-doped POAN) has been studied by the spectrophotometric technique and supported by molecular mechanics (MM) calculations. The decrease of the absorbance (λ = 720 nm, dark green), with increasing the concentration of the inorganic oxidizing agent (KMnO₄) could be attributed to the oxidative hydrolysis mechanism. The oxidative hydrolysis constant (K_h) is highly dependent on the strength and the acid used. HClO₄-doped POAN matrix has the ability to store CE about 128.878 kJ g^-1 at 720 nm in a condensed lightweight form. MM calculations suggests that the potential energy (PE) in kJ mol^-1 of the optimum molecular geometric (OMG) structure of HC1O₄ -doped POAN matrix is at least twice times (2.052) of magnitude more stable than that of the OMG of the base form of POAN matrix. Kinetic parameters of the oxisdative hydrolysis reaction were deduced employing a computer-oriented kinetic analysis of the absorbance (A) at 720 nm against the time (t) data. The results obtained indicate that the rate controlling process is governed by the Ginstling-Brounshetin-equation three-dimensional diffusion (D4). The proposed mechanism for the oxidative hydrolysis of HA-doped POAN matrix is also substantiate by MM calculations. Activation parameters for the rate of the hydrolysis oxidative process of HClO₄-doped POAN chain have been computed and discussed.

8 illus, 5 tables, 40 ref

013022   Ahmed B;Masoodi M H;Khan S (Dep of Pharmaceutical Chemistry. Faculty of Pharmacy, Jamia Hamdard, Hamdard Nagar, New Delhi-110 062, Email: drbahmed@rediffmail.com) : Pachycanthine: a new isoquinoline alkaloid and its antihepatotoxic activity from Berberis pachycantha koehne. Indian J Chem-Sect B 2008, 47(6), 945-51.

The methanolic extract of whole plant of Berberis pachycantha Koehne (Berberidaceae) has afforded a new isoquinoline alkaloid, which was characterized as 8,9-dimethoxy-5,6,12<3,6a-tetrahydro-2H-l,3-dioxoleno[4,5-g] isoquinolino [3,2-a] isoquinoline on the basis of spectral and chemical studies and has been designated as pachycanthine 1. The pachycanthine 1 exhibited a significant antihepatotoxic activity by 25-53% (dose: 50 mg/kg) with respect to standard silybon-70 (36-60%) against CCl₄ induced toxicity in Albino Wistar rats.

7 illus, 3 tables, 23 ref

013021   Agarwal S G;Gupta A;Kapahi B K;Baleshwar (NO, Indian Institute of Integrative Medicine (Regional Research Laboratory, Jammu-Tawi-180 001, Email: agarwalsg@yahoo.com) : Composition of rose water constituents. Indian Perfumer 2008, 52(3), 19-21.

The rose (Rosa damascene) volatiles obtained by extraction of rose water with dichloromethane were studied by GC and GC-MS and found to contain a large amount of 2-phenylethanol (69.7-81.6%) and consequently lower levels of linalool (1.5-3.3), citronellol (1.8-7.2), nerol (0.2-4.2), geraniol (0.9-7.0%) along with rose oxides and other minor components. The study confirmed that 2-phenylethanol is the main component of rose flower and rose water but its quantity in rose oil is much less being highly water soluble. Rose water prepared from fresh flowers contained 0.06- 0.08% volatile oil while that obtained from equivalent quantity of dry flowers contained 20-50% less oil, indicating oil loss during drying of flowers.

29 ref

013020   Abdullah Z;Salleh N M;Bakar M A A;Aiyub Z (Chemistry Dep, Malaya Univ, 50603 Kuala Lumpur, Malaysia, Email: maizathul_akmam@yahoo.com) : 2-N-anilinopyridine and 2-N-piperidinopyridine: fluorescence properties. Int J chem Sci 2008, 6(2), 933-41.

2-Chloropyridine, which was obtained commercially, was used as the precursor for the preparation of 2-N-piperidinopyridine and 2-N-anilinopyridine. Fluorescence studies were carried out in various solvents, in capped and uncapped condition. 2-N-Piperidinopyridine showed the highest fluorescence peak in ethanol for both conditions. The fluorescence peak of 2-N-piperidinopyridine was observed at 372 nm, when excited at 258 nm for capped sample, where the uncapped sample showed fluorescence peak at 372 nm, when excited at 293 nm. Similar results were obtained with capped and uncapped samples of 2-N-anilinopyridine; whereby fluorescence peak was observed at 383 nm when excited at 277 nm for capped condition, and fluorescence peak at 335 nm when excited at 384 nm for uncapped condition. The fluorescence peaks of 2-N-anilinopyridine were recorded at higher wavelengths to 2-N-piperidinopyridine.

4 illus, 2 tables, 9 ref

012088   Zhang Q;Zhao L;Teng B;Luo M;Xie Y;Yue L (NO, Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Inst, Jinhua 321004, PR China, Email: zhaoleihong@163.com) : Palladium catalysts doped in Ce_xZr_1-xO₂ washcoated monoliths for toluene combustion. Indian J Chem-Sect A 2008, 47(2), 186-93.

Novel Ce_xZr_1-xO₂ washcoat has been prepared by an impregnation method, which acts as a host for the active Pd component to prepare a series of the Pd-Ce_xZr_1-xO₂/monolith (x=1, 0.8, 0.6 and 0.5) catalysts for toluene combustion. SEM, BET, XRD, Raman spectroscopy, and H₂-TPR techniques have been used to characterize the samples. The washcoat shows excellent adhesion to the monolith. The Zr component of the Pd-Ce_xZr_1-xO₂/monolith catalysts plays an important role in the catalytic activity for toluene combustion and the order of the catalytic activity is x = 0.8>0.6>0.5≈1. There is strong interaction among palladium, ceria-zirconia solid solution and the monolith.

5 illus, 2 tables, 33 ref

012087   Yu W;Zhou C;Lu D;Zhang B;Xu X (NO, College of Zhijiang, Zhejiang Universty of Technology, Hangzhou, 310024, PR China, Email: ywh@zjut.edu.cn) : Synthesis and characterization of Al-HMS catalysts and their application for t-butylation of toluene. Indian J Chem-Sect A 2008, 47(2), 181-5.

Al-HMS (hexagonal mesoporous silica) with Al content in the range 2 - 10 mol% has been synthesized using dodecylamine surfactant as template and aluminum s-butoxide as the aluminum source. The mesoporous structure has been confirmed by XRD and the surface area and pore size calculated by BET equation and BJH method using nitrogen adsorption-desorption technique. The aluminum atom coordination has been determined by ²⁷Al MAS NMR. The total acidity and the type of acid sites have been studied using TPD of chemisorbed 2,6-di-tert-butylpyridine and IR spectra of pyridine adsorption, respectively. The Al-HMS materials possess abundant tetrahedral aluminum in the HMS framework and also Bronsted and Lewis acid sites. The catalytic activities of the materials have been tested in 4-t-butylation reaction of toluene in liquid phase. Maximum conversion (85.1%) of toluene has been achieved with 10%Al-HMS catalyst, and high selectivity (> 80%) for 4-t-butyltoluene is observed over 2 - 4.8% Al-HMS catalysts. The conversion of toluene increases with increase of Al content, and the selectivity of 4-t-butyltoluene decreases to 70% when Al content is increased up to 10% in HMS materials.

4 illus, 2 tables, 16 ref

012086   Yadav J S;Soni M;Verma S;Srivastava J K (Chemical Engineering Dep, IES-IPS Academy Indore, Madhya Pradesh, Email: yadav.jag2007@yahoo.co.in) : Removal of copper ion (Cu<. Pollut Res 2008, 27(2), 323-6.

The presence of heavy metals in the environment represents a very significant and long term environment and health hazard. The effluent of many industries such as electroplating, paper and pulp, wool preserving, chemical and petrochemical, fertilizer etc. contains high level of metal ions. A batch study on adsorption of copper (II) form aqueous solution, was carried out by using agricultural waste material soybean hulls. A modification method was adopted to enhance metal ion adsorption. Primarily hulls were excreted with 0.1 NaOH and then modified with 0.6M citric acid. The effects of initial concentration, adsorbent amount, pH of solution, contact time were studied. The copper ion removal efficiency using soybean hulls is 96% under these conditions and the concentration of copper ion has been reduced below the industrial standard (2.0 mg/1).

5 illus, 28 ref

012085   Tiwari V;Kumbhani S;Shastri I;Sharma V (Chemistry Dep, JNV University, Jodhpur-342 005, Email: drpkvs27@yahoo.com ) : Kinetics and mechanism of oxidation of some thioacids by benzyltrimethylammonium chlorobromate. Indian J Chem-Sect A 2008, 47(10), 1520-3.

Oxidation of some thioacids, viz., thioglycollic, thiolactic and thiomalic acids by benzyltrimethylammonium chlorobromate (BTMACB) has been studied in acetic acid. The reaction is first order with respect to BTMACB. Michaelis-Menten type of kinetics have been observed with respect to the reductants. The reaction has been studied in solvents of different compositions of acetic acid and water. The solvent composition effect has been analysed using Grunwald-Weinstein equation. A mechanism involving the formation of an intermediate complex in the pre-ªequilibrium and its subsequent decomposition in slow step has been proposed.

^ssc4 tables, 15 ref

012084   Thakur A;Baghel S;Tiwari K;Thakur M;Chandel K S;Badole G L;Thakkar A (Chemistry Dep, Rishiraj Institute of Technology, Indore, Email: abhilasthakur@yahoo.com) : Modeling of lipophilicity in benzoate derivatives: A 3D approach. Res J Chem Envir 2008, 12(3), 68-75.

Describes the role of molecular descriptors and various substitutions over the lipophilicity of the Benzoate derivatives. To perform the study two different sets of Benzoate derivatives of 9 and 17 compounds respectively are tested. Physicochemical properties and indicator parameters are used as descriptor to model the lipophilicity. The multiple linear regressions analysis indicated that a combination of adhoc molecular descriptors and the indicator parameters yielded a statistically significant model for modeling the lipophilicity of benzoate derivatives. The study of 3 dimensional features is made by the quantum molecular modeling.

12 illus, 2 tables, 14 ref

012083   Tewari N;Menghani H;Hamarapurkar P;Suthar A; Chauhan V S (Herbal Dep, Nicholas Piramal Research Centre, 1, Nirlon Complex, Off. Western Express Highway, Goregaon (East), Mumbai-400 063, Email: vchauhan@nicholaspiramal.co.in) : Developing a new high performance thin layer chromatography method for quantitative estimation of hyperforin in Hypericum perforatum. Pharmacog Mag 2008, 4(16), 304-8.

Deals with development and standardization of HPTLC method used for quantification of Hyperforin in Hyper/cum perforatum L. Hypericum perforatum L. commonly known as St. John's wort, is a plant of the family Hypericaceae, is today most widely known as a herbal treatment for depression. One of its constituents, Hyperforin, appears to be responsible for its pharmacological activity. Hence, a need to develop and standardize an analytical method for quantification of Hyperforin, which can be used for standardization of extract of Hypericum perforatum. An attempt has been made to quantify Hyperforin in Hypericum perforatum extracts by HPTLC method. The lowest detectable limit of Hyperforin was found upto 100 nanograms and provides good resolution and separation of Hyperforin from other constituents of Hypericum perforatum. Further, recovery values of Hyperforin were found to be about 96%, which shows the reliability and suitability of the method. This HPTLC method was found to be reproducible, accurate and precise. The structure of isolated Hyperforin was characterized and confirmed by various advanced spectroscopic methods.

4 illus, 3 tables, 14 ref

012082   Suryanarayana I;Anata Ramam V;Krishna Prasad K M M;Sambasiva Rao R (Inorganic and Physical Chemistry Div, Indian Institute of Chemical Technology, Hyderabad-500 007, Email: iragavarapu@iict.res.in) : Electronic parameters of aliphatic hydrazides with AM1 and PM3 Hamiltonians. Indian J Chem-Sect A 2008, 47(2), 199-206.

Optimized geometries and quantum chemically derived electronic parameters of physicochemical significance of mono- and di-aliphatic hydrazides are investigated using AMPAC 6.7 package. The number of hydrazide fragments enhances the stability as indicated by total energy and heat of formation. The partition of quantum chemical energy into its constituents is reported. The order of stability observed for different aliphatic acid hydrazides is: AdipHy > MalHy > OxalHy > AcetHy > FormHy. LUMO is on the second hydrazide fragment and HOMO as well as LUMO spread only on one of the fragments for dihydrazides with the exception for AdipHy. The shapes inferred from total electron density surface appear to be like banana for MalHy and nut (bent) for AdipHy. The negative charge on nitrogen of amino group is greater than that on oxygen of carbonyl and N of imino of hydrazide fragment. Linear (α) and third order (γ) polarizabilities increase from monohydrazides to dihydrazides, but the total dipole moments show the trend as: MalHy > AcetHy > AdipHy > FormHy > OxalHy. The data relating to parameters of biological/physical relevance and chemical reactivity are reported. These results from SEMO procedures with MNDO, AM1, PM3 and SAM1 Hamiltonians in gaseous phase reveal that the hydrazides participate in charge and orbital-based interactions. The bond lengths, bond angles and dihedral angles are same for optimized geometry in a typical study by changing SCF convergence limits and different quasi Newton algorithms.

4 illus, 6 tables, 26 ref

012081   Su N;Guo Q;Wu S (Chemistry Dep, Zhejiang University, Hangzhou 310027, PR China, Email: wushi@zju.edu.cn) : Stability and spectroscopic studies on oxygenated armchair SWCNTs. Indian J Chem-Sect A 2008, 47(10), 1473-9.

Theoretical studies on the electronic structures and spectroscopy of oxygenated armchair single-walled carbon nanotubes have been carried out using semi-empirical AM 1 and INDO/CIS methods as well as density function theory. Based on the B3LYP/3-21 G optimized geometries, the energies of the oxygenated SWCNTs have been calculated al B3LYP/6-3IG(d) level. The energy gaps of SWCNTs decrease due to the addition of the oxygen atom. The oxygenated SWCNTs, in which the oxygen atoms are located on the vertical bonds relative to the main axis of SWCNTs are more stable than those in which the oxygen atoms are added on the sloping bonds. The first and strongest absorptions in the electronic spectra of the oxygenated SWCNTs computed using INDO/CIS method are red shifted in comparison with those of SWCNTs. The main absorptions in the IR spectra of the oxygenated SWCNTs calculated with AM 1 method are blue shifted as compared with those of SWCNTs. These two kinds of oxygenated SWCNTs can be distinguished using the chemical shifts of the bridged carbon atoms calculated at B3L YP/3-21 G level.

1 illus, 2 tables, 27 ref

012080   Sonawane G H;Shrivastava V S (PG Studies and Research in Chemistry Dep, GTP College, Nandurbar-425 412, Email: drvinod_shrivastava@yahoo.com) : Adsorption kinetics for the removal of malachite green from aqueous solution by using banana leaves. Pollut Res 2008, 27(2), 339-43.

The absorption ability of low cost non-conventional adsorbent like banana (Musa ParadisiacaL) leaves powder (BLP) for the removal of malachite green was investigated by batch method. The effect of contact time, adsorbent dosage, pH, particle size, initial dye concentration, kinetics of adsorption was studied. The optimum pH was 8 and the dosage required was 8 gm/L for the removal of malachite green. It has been observed that the removal of malachite green increases with increasing contact time and becomes constant after 50 minutes. As adsorbent dosage is increased from 2 to 24 gm/L. the percentage removal increases continuously up to 98.17% The effect of pH on the removal of malachite green showed that the percentage adsorption increases with increase in pH upto 8. The adsorption data was also fitted within Freundlich isothenl1, Langmuir isothenl 1, Langergrans equation and Weber Morris equation.

3 illus, 2 tables, 21 ref

012079   Sim Y L;Ahmad W H W;Ariffin A;Niyaz Khan M (Chemistry Dep, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia, Email: niyaz@um.edu.my) : Determination of pK_a of ammonium and phenolic groups: evidence of intromolecular hydrogen bonding in aqueious solution. Indian J Chem-Sect A 2008, 47(2), 240-5.

Ionization constants of 2-hydroxyanilinium, 2-methoxyanilinium, 4-nitroanilinium ions, N-(2'-hydroxyphenyl)-phthalamic acid and N-(2'-methoxyphenyl) phthalamic acid, determined spectrophotometrically, have been rationalized in terms of internal hydrogen bonding and steric hindrance between o-substituent and reaction site.

^iia1 illus, 1 table, 14 ref

012078   Shintre S;Thakur P (Chemistry Dep, Pune Univ, Pune-411 007, Email: prthakur@chem.unipune.ernet.in) : Photo-catalyzed degradation of p-nitrophenol employing TiO₂ and UV radiations. J envir Sci Engng 2008, 50(4), 299-302.

Heterogeneous photocatalysis on metal oxide semiconductor particles is an advanced oxidation technology (AOT), which has been effective means of removing organic pollutants from water streams as it utilizes ultraviolet light with semiconductors acting as photocatalyst and leads to complete mineralization of pollutants to environmentally harmless compounds. In the present investigation, the photo-catalyzed degradation studies of p-Nitrophenol (PNP) were carried out in laboratory scale immersion well UV photo-reactor using semiconductor photo-catalyst TiO₂ in suspension. For this purpose, low pressure 12 W mercury lamp was used and the effect of (i) time of irradiation, (ii) dose of TiO₂, (iii) initial concentration of PNP and (iv) the addition of H₂O₂ to the system was studied to arrive at optimum process parameters for the complete degradation and decolorization of PNP. Simple UV irradiation could not achieve significant degradation of PNP. But UV+aeration+TiO₂+ H₂O₂ combination achieved almost complete degradation of PNP. The spectrophotometric analysis showed that the rate of degradation of PNP was very fast in initial two hours and the maximum degradation was achieved in 5 hours. The degradation was found to increase in the order UV < UV + aeration < UV + aeration + TiO₂ < UV + aeration + TiO₂ + H₂O₂, and the degradation was found to be almost 100% for UV + aeration + TiO₂ + H₂O₂,91 % for UV + aeration + TiO₂,43% for UV + aeration and only 26% for UV irradiation.

5 illus, 15 ref

012077   Sharma M;Sharma A (Chemistry Dep, Jammu Univ, Jammu-180 006, Email: mlakhanpal@rediffmail.com) : Activation parameters of flow through micro porous and ion exchange separators. Res J Chem Envir 2008, 12(3), 82-4.

Studies of the hydrodynamic flow of aqueous solutions of Acetonitrile and Dioxane through a micro porous and an ion-exchange separator are described. The permeability values are interpreted in terms of a psuedo-activation process. The enthalpy of activation, ΔH* and the entropy of activation, ΔS* have been estimated from Eyring's rate equation.

8 tables, 21 ref

012076   Shanthalakshmi K;Belagali S L (Studies in Environmental Science Dep, Mysore Univ, Mysore-570 006, Email: Shanthil806@yahoo.co.in) : Synthesis and spectrophotometric studies of 4-(2-benzothiazolylazo) - 2-amino -3-hydroxypyridine deriv as an analytical reagent. Res J Chem Envir 2008, 12(3), 59-62.

4-(2-benzothiazolylazo) -2-amino -3-hydroxypyridine (BTAAHP) was synthesized and its potential as complexing agent for determination of metals has been studied spectrophotometrically. The reagent is quite sensitive for determination of Copper and it reacts instantly with Copper (II) to form reddish purple complex (λ_max 540 nm) at pH 2.8. Under this condition, the selectivity of the reagent is excellent and most metal ions do not interfere except for Nickel and Cobalt. Molar absorptivity of the Copper complex is 9.8 x 10⁵ L mol^-1 cm^-1 in aqueous acetone at pH 2.8 (λ _max 540 nm), the system confirms Beer's law for 1.25 mg L^-1 to 4.4 mg L^-1of Copper. A further advantage of estimation of Copper using this reagent is that, an extraction procedure is not necessary and analytical procedure is therefore very simple. Estimation of Zinc and Cadmium can be done at pH 4.45.

2 illus, 1 table, 14 ref

012075   Sarika P R;Chandramohanakumar N (Chemical Oceanography Dep, School of Marine Sciences, Cochin Univ of Science and Technology, Kochi-682 016, Email: sarika_pr@yahoo.com) : Distribution of heavy metals in mangrove sediments of cochin estuary. Res J Chem Envir 2008, 12(3), 37-44.

The distributions of Fe, Mn, Cu, Cd and Zn in three different mangrove ecosystems of Cochin estuary were examined. The order of abundance of metals were in the order Fe >Mn ≈ Zn > Zn ≈ Mn > Cu > Cd. The metal content in sediment was well within the range reported for metals from other mangroves of the world, with some exceptions. The average Cd content was greater than 1 /ng/g at all three mangrove stations. The iron concentrations in mangrove sediments were higher than that reported for estuarine sediments. Two way ANNOVA (stations X months) showed significant spatial variations for all metals except Cd; monthly variations are found to be statistically insignificant.

2 illus, 5 tables, 61 ref

012074   Saraswat R;Saraswat D;Singh A (Chemistry Dep, Meerut College, Meerut) : Antimicrobial studies of the volatile constituents of Fagopyrum cymosum. Prog Agric 2008, 8(2), 283-4.

2 tables, 8 ref

012073   Sahu S;Behera P K (Chemistry Dep, Sambalpur University, Jyoti Vihar, Sambalpur-768 019, Email: pkbehera2003@yahoo.co.in) : Fluorescence quenching of 2-naphthol by methyl acrylate in micellar medium. Indian J Chem-Sect A 2008, 47(10), 1516-19.

Fluorescence quenching of 2-naphthol in presence of methyl acrylate has been studied in different concentrations of anionic (sodium lauryl sulphate) and cationic (cetyl trimethyl ammonium bromide) micelles. It is found that compartmentalization of 2-naphthol and methyl acrylate affects the quenching process. Increase of accommodation of the probe and the quencher in the micelles affects the Stem-Volmer quenching constant (K_sv) for 2-naphthol and 2-naphtholate.

^ssc3 illus, 2 tables, 17 ref

012072   Rubio E;Rodriguez-Lungo V;Fuentes R;Castano V M (Centro de Fisica Aplicada y Tecnologia Avanzada, U.N.A.M., A.P. 1-1010, Queretaro, 76000, Mexico, Email: castano@fata.unam.mx) : Synthesis of α-Si₃N₄ whiskers from rice hulls. Res J Chem Envir 2008, 12(3), 63-7.

Reports the formation of α-Si₃N₄ whiskers through nitruration, at 1400°C, of ash rice hulls, which constitutes a good source of amorphous silica and carbon, both in intimate contact. The structural and morphological evolution of silicon nitride during the conversion process was examined by X-ray diffraction and Scanning Electron Microscopy.

7 illus, 1 table, 10 ref

012071   Rao L (NO, , 1403, Cascade-I, Kulupwadi, Borivli (east), Mumbai-400 066, Email: leenavrji@gmail.com) : Solid acid catalysts in green chemistry. Resonance 2007, 12(8), 65-75.

Article deals with various 'supported' acid catalysts developed as alternatives for the conventional ones in organic synthesis. They have advantages such as producing less toxic waste and using less energy.

9 illus, 15 ref

012070   Ranga Reddy S;Kalyani P;Manikyamba P (Chemistry Dep, Kakatiya University, Warangal-506 009, Email: mani_prerepa@yahoo.co.in) : Computational studies and reactivity of nucleophiles in benzylation reactions. Indian J Chem-Sect A 2008, 47(2), 236-9.

Nucleophilic substitution reactions of benzyl bromide using 2-mercapto benzimidazole, 2-mercaptobenzoxazole and 2-mercaptobenzothiazole as nucleophiles have been studied in methanol and acetone media. The higher reactivity of 2-mercaptobenzimidazole is attributed to the presence of two nitrogen atoms holding a pair of electrons on either side of the > C=S group. The heat of formation, ΔH_f, computed from AM1 studies indicates that the reactivity of the nucleophiles is related to ΔH_f, and HOMO-LUMO gap of the nucleophile.

3 tables, 22 ref, 1 scheme

012069   Ram Pratap;Yadav O P (Chemistry Dep, Government College, Hisar-125 001) : Effect of inorganic ions on surface properties of a non-ionic surfactant at various temperatures in aqueous medium. Indian J Chem-Sect A 2008, 47(10), 1524-7.

Studeies on surface tension of iso-octyl phenoxy polyethoxy ethanol in water and in the presence of aqueous Na₂SO₄ and Na₃PO₄ salts having varying anion valency at 288, 293 and 298 K are reported. The values of critical micelle concentration, maximum surface excess concentration and minimum area per molecule of the surfactant at air-liquid interface have been evaluated. Thermodynamic parameters of micellization and those of adsorption have also been evaluated. The micellization process appears to be endothermic in nature while negative values ofΔG⁰_mm and positive values of ΔS⁰_m support its spontaneity.

^ssc2 tables, 25 ref

012068   Paramasivam M;Aktar M W;Poi R;Banerjee H; Bandyopadhyay A (Regional Analytical Lab of Medicinal and Aromatic Plants, Agricultural, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur-741 252, Email: sivam25@gmail.com) : Improved HPTLC method for determination of curcuminoids in Curcuma longa. Biomed 2007, 2(2), 164-8.

Simple high performance thin layer chromatographic (HPTLC) method has been developed for the simultaneous determination of the pharmacologically important active Curcuminoids viz. curcumin, demthoxycurcumin and bisªdemethoxycurcumin in Curcuma longa L. The assay combines the separation and quantification of the analytes on silica gel 60 GF₂₅₄ HPTLC plates with visualisation under UV and scanning at 425 nm. Using this technique, the alkaloidal content of different parts of the title plant has been determined.

1 illus, 2 tables, 9 ref

012067   Pandhare G R;Shinde V M;Deshpande Y H (P.G. Dep of Chemistry, Padamshri Vikhe Patil College, Pravaranagar, Dist. Ahmednagar-413 713, Email: Pandharegr@rediffmail.com) : Complexes of schiff bases with Ni<. Res J Chem Envir 2008, 12(3), 90-4.

Ligation properties of Schiff bases derived from 2- aminophenol and substituted aldehydes have been investigated for this purpose. Ni^IIand Cu^II complexes of these ligands are synthesized and characterized on the basis of elemental analysis, magnetic, thermal and spectral studies. The complexes conform to 1:1 stoichiometry and are non electrolytic in nature. The coordination of the ligand takes place through azomethine nitrogen and phonolic oxygen of the Schiff bases in the octahedral environment. All the metal complexes show antimicrobial activity.

2 illus, 1 table, 19 ref

012066   Nayak B B;Sahu S;atel S;Dash S;Mishra B K (Centre of Studies in Surface Science and Technology, School of Chemistry, Burla-768 019, Email: bijaym@hotmail.com) : Ce(IV) oxidation of alcohols using cetyltrimethylammonium ceric nitrate. Indian J Chem-Sect A 2008, 47(10), 1486-90.

Cetyltrimethylammonium ceric (CTACN) has been used to oxidize some primary aliphatic and alicyclic alcohols in acetonitrile medium and the reaction kinetics have been investigated by spectrophotometric method. The decrease in the rate with increased concentration of CTACN has been attributed to the formation of reversed micelles by the oxidant in organic medium. An asymptotic decrease in rate with increase in [CTAB] supports the reversed micellization in the reaction medium. The plots of rate constants with [substrate] reflect the partitioning of the substrate in the reversed micellar system of CTACN. The kinetic isotope effect (k_H/k_D) of 1.97 has been attributed to the dehydrogenation mechanism for the oxidation of alcohols.

3 illus, 1 table, 23 ref

012065   Narayan H J;Mahendra A A (Chemistry Dep, Wilson College, Chowpatti, Mumbai-400 007, Email: jayvantr@rediffmail.com ) : Simultaneous determination of abamectin and praziquantel in oral paste (veterinary formulations) using high performance liquid chromatography. Res J Chem Envir 2008, 12(3), 45-51.

The aim of the study is to develop a high performance liquid chromatography (HPLC) assay, for rapid, simultaneous determination of Abamectin and Praziquantel in Warmnil oral paste (Veterinary Formulation). The experimental procedure involved reversed-phase-HPLC with a Inertsil ODS column (250 X 4.6 mm ID, 5 μm particle size), buffer, methanol and acetonitrile in volume ratio of 15:33:52 as mobile phase, UV detection at 254 nm for both Abamectin and Praziquantel. The flow rate of the mobile phase was adjusted to 1.0mL per minute. Calibration curves were linear over the range 0.46-55.35 ng/mL for Abamectin and 0.59-711.3 μg/mL for Praziquantel. The recoveries ranged from 98% to 102%, the % RSD for intra day and inter day precision were = 2.0 for both Abamectin and Praziquantel. Formulation components did not give rise to any interfering peaks at the retention time of Abamectin and Praziquantel. Due to its simplicity and accuracy, the assay method is suitable for routine analysis of both drugs in oral paste formulations.

5 illus, 4 tables, 24 ref

012064   Menon S K;Jose P;Harikrishnan U;Pal U (Chemistry Dep, , Navarangpura, Ahmedabad-380 009, Email: sobhanamenon@rediffmail.com) : Calix[6]arene derivative as chromogenic sensor for anti-hypertensive drugs. Indian J Chem-Sect A 2008, 47(2), 246-50.

Simple, rapid, and sensitive spectrophotometric method has been developed for the determination of atenolol, propranolol hydrochloride and metaprolol tartarate. The method is based on the reaction of these drugs as n-electron donors with acceptor groups on macrocyclic ring of calixarene. Due to the rapid development of color at ambient temperatures, the chromogenic calix[6]arene derivative can be used for the determination of these β-adrenergic blocking drugs. The association constants (K_c^AD) and free energies for the complexes have been determined. The proposed method can be used to determine the drugs in pharmaceutical tablets and urine.

6 tables, 32 ref, 1 scheme

012063   Mandal B;Roy U S (Chemistry Dep, Visva-Bharati, Santiniketan-731 235, Email: bhabatosh_mandal@yahoo.co.in) : Extraction chromatographic method of preconcentration and separation of lead(II) with high molecular mass liquid cation exchanger, Versatic 10. Indian J Chem-Sect A 2008, 47(10), 1497-1502.

Selective method has been developed for the extraction chromatographic separation of lead(II) with Versatic 10 (liquid cation exchanger) coated on silanised silica gel. Its quantitative extraction has been achieved from 0.1M 0.1M acetate buffer at the optimum pH 4.5-6.0. The effects of pH, flow-rate, stripping agents on extraction and elution have been investigated. Exchange capacity of the prepared exchanger at different temperatures with respect to lead(II) has been determined. The extraction equilibrium constant (K_ex) and different standard. thermodynamic parameters have also been calculated by temperature variation method. The effect of pH on R_f values in ion exchange paper chromatography has been investigated. Lead(II) has been separated from synthetic multi-component mixtures containing various metal ions associated with it in ores and alloy samples. The method effectively permits sequential separation of lead(II) from synthetic quaternary mixture containing its congeners Cu(II), Sn(II), Hg(II) and Cu(II), Cd(II), Bi(III) of the same analytical group. The method is found effective for removal and recovery of lead(II) from industrial waste and standard alloy samples following its preconcentration on the column. A plausible mechanism for the extraction of lead(II) has been suggested.

2 tables, 31 ref

012062   Liu W;Wu Y (NO, Institute of Applied Chemistry, Nanchang University, Na Chang 330031, PR China) : Effect of organic fuels on catalytic properties of La_0.8Sr_0.2CoO₃ with large surface area. Indian J Chem-Sect A 2008, 47(2), 194-8.

Perovskite-type La_0.8Sr_0.2CoO₃ oxides have been prepared by solution combustion synthesis and their catalytic performance for CH₄ combustion reaction has been studied. The prepared samples have been characterized by XRD, IR. BET and TPR. The effect of organic fuels on the struclllre and the catalytic activities of La_0.8Sr_0.2CoO₃ catalysts have been investigated. Results indicate that all the La_0.8Sr_0.2CoO₃ catalysts prepared by solution combustion synthesis have large specific surface area, and the structure and catalytic activities of the catalysts are related to the organic fuels. The best catalytic activity is shown by the La_0.8Sr_0.2CoO₃ catalyst prepared with DL-alanine. The activity of the catalyst can be explained in terms of smaller crystallite size, larger specific surface area, lower activation energy and more mobility of chemisorbed oxygen on the surface and in the vacancies.

4 illus, 2 tables, 20 ref