*P.G. Centre of Chemistry (M.U.)  College of Commerce Patna India 

Chemistry Department, Ganga Devi Mahila Mahavidyalaya Kankarbagh Patna Bihar India

Department of Biotechnolgy College of Commerce Patna India

Email: rameshwarnath.pandey@yahoo.com

The synthesis, characterization and biological screening of six coordinated ruthenium(III) chelates of the type [RuClL2E3] (E = P/As; L = monobasic bidentate 1-substituted tetrazoline-5-thione anion) are reported. Antifungal activity of ligands and complexes against A. Flavus, A. Parasiticus and C. Albicans using Carbendazin as standard and antibacterial activity against S. Aureus, B. Subtilis and E. Coli are examined. All complexes are characterized using various physicochemical, IR, electronic and 'H NMR Spectral data.

A semi-organic crystal–[(E)-benzylideneamino] thiourea(EBAT) was grown by adopting slow evaporation solution growth technique (SESGT) using methanol as a solvent.The functional group of harvested crystals were studied by the Fourier Transform (FT-IR) spectral analysis. The UV Spectra confirms the optical transparency. This is more helpful to use these crystals in opto applications. The harvested crystal of [(E)-benzylideneamino] thiourea was characterized by proton nuclear magnetic resonance and 13C NMR spectra which shows the molecular structure of the crystal. The TGA and DSC confirm the decomposition of the sample at 153.50oC. It further confirms the grown crystal [(E)-benzylideneamino] thiourea (EBAT) is thermally stable up to 153.50oC. The crystalline powder of the grown crystals was examined by X-ray diffraction studies. Second harmonic generation efficiency of the powdered [(E)-benzylideneamino] thiourea was tested using Nd:YAG laser and it is found to be ~5.1 time that of potassium
dihydrogen ortho phosphate.