Volume-9 ~ Issue-7 ~ July-2016

Abstract: PBI-I was synthesized by condensing 3,3'- diaminobenzidine (DAB) and Isophthalic acid(IPA) by solution polycondensation method using polyphosphoric acid (PPA). PBI-I has inherent viscosity ≥1dl/gm. Four dense membranes with different thickness were prepared by solution casting method under identical conditions using 3%(w/v) polymer solution in Dimethylacetamide (DMAc). Membranes samples of 4x4cm2 with different thickness were dipped in H3PO4 solution of various concentrations........
Keywords: Polybenzimidazole(PBI), Phosphoric acid doped membrane, Fuel cell performance evaluation

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Abstract: 2-propionyl-amino-5-Methyl-1,3,4-thiadiazole (PAMTDA) and 2-propionyl-amino-5-ethyl-1,3,4-thiadiazole (PAETDA) and their Ni(II) and Zn(II) complexes were synthesized and characterized using LC-MS, IR, UV, ESR, 1H-NMR,(D2O exchangeable),13C-NMR and TGA. The proton-ligand and metal-ligand constants[M=Ni(II), Zn(II)] of these compounds were determined in 70%(v/v) DMF-water medium at 0.1M KNO3 ionic strength and 303K temperature by using Irving-Rossetti titration method and the stability constant (Log β) values were found to follow Irving William series of stability of complexes.........
Keywords: Potentiometric titrations, spectrofluorophotometry, thermal analysis, UV absorption spectroscopy, viscosity measurements.

[1]. Abhishek Kumar Jain, Simant sharma, Ankur vaidya, Veerasamy Ravichandran and Ram Kishore Agarwal. Chem Biol Drug Des. 2013;81:557-576.
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Abstract: This study assessed the antimicrobial activity of four synthesized organotin (IV) derivatives of potassium hydrogen hexanedioate, L: Bu2SnL2 (1), Bu3SnL (2), Ph2SnL2 (3) and Ph3SnL (4). The compounds were tested for antimicrobial activity against four strains of Gram-positive bacteria: Staphylococcus aureus, Streptococcus pyogenes, Bacillus cereus, Corynebacterium ulcerans, four strains of Gram- negative Bacteria: Escherichia coli, Klebsiella pneumoniae, Proteus mirabilis and Pseudomonas aeruginosa and four fungi strains of :Histoplasma capsulatum, Mucor mucedor, Penicillium helicium and Penicillium chrysogenum.........
Keywords: Organotin(IV) derivatives, potassium hydrogen hexanedioate, Antimicrobial Activity

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