International Science Community Association Research Journal of Chemical Sciences 2231 - 606X 7 1 2017 01 18 Synthesis, spectral, thermal and biological studies of some unsymmetrical Schiff base metal complexes 8 12 EN Borse G.P. 1 Department of Chemistry, R.L. College, Parola–425 111, MS, India Pethe G.B. 1 Department of Chemistry, Sant Gadge Baba Amravati University Amravati-444 602, MS, India Bansod A.D. 2 Department of Chemistry, Sant Gadge Baba Amravati University Amravati-444 602, MS, India Devhade J.B. 3 Department of Chemistry, Sant Gadge Baba Amravati University Amravati-444 602, MS, India Maldhure A.K. 4 Department of Chemistry, Sant Gadge Baba Amravati University Amravati-444 602, MS, India Aswar A.S. 5 Department of Chemistry, Sant Gadge Baba Amravati University Amravati-444 602, MS, India > Research Paper 2016 3 22 2017 01 18 Unsymmetrical tetradentate Schiff base derived from Salicylaldehyde, 2-hydroxy-3-methoxy benzaldehyde and ethylenediamine and its complexes with VO(IV), Cr(III), Mn(III), Fe(III) and UO2(VI) have been prepared. These complexes have been characterized by elemental analysis, IR and electronic spectra, magnetic moments, XRD and thermal analysis. The complexes are colored and stable in air at room temperature. The thermal behavior of metal complexes shows that the hydrated complexes loses water molecules of hydration in the first step; followed by decomposition of ligand molecule in the subsequent steps leaving behind metal oxide as end product. The IR spectra suggest that ligand behaves as bi-negative tetradentate nature with ONNO donor sequence sites of the azomethine nitrogen and phenolic oxygen towards central metal ion. The solid state electrical conductivity of compounds was measured by two probe method over 313-403 K temperature range. Solid state electrical conductivity studies reflect semiconducting behavior of the compounds in the studied temperature range as their conductivity increases with increase in temperature. The powder XRD analysis of VO (IV) complex suggests the triclinic crystal system. The ligand and its complexes were screened for their biological activity against bacteria E. coli , S. abony, S. aureus and B. subtilis by the agar well diffusion method and most of complexes were found to be moderately active against the organisms. Copyright@ International Science Community Association