Synthesis, characterization, thermal, electrical conductivity and biological studies of Schiff base metal complexes

Department of Chemistry, Sant Gadge Baba Amravati University. Amravati-444 602, Maharashtra, India E-mail : aswar2341@rediffmail.com Department of Industrial Chemistry, Arts, Science and Commerce College, Chikhaldara-444 807, Maharashtra, India Department of Chemistry, Shri Shivaji College, Akola-444 001, Maharashtra, India Manuscript received online 25 April 2012, revised 28 August 2012, accepted 22 November 2012 The coordination complexes of MnII, CoII, NiII, CuII , TiIII, CrIII, FeIII, zrlV and UO2VI with new Schiff base derived from 3-acetyl-6-methyi-2H-pyran-2,4(3H)-dione (dehydroacetic acid) and thiocarbohydrazide have been synthesized. These complexes have been characterized on the basis of elemental analysis, IR and electronic spectra, magnetic moment and thermogravimetric analysis. The complexes are colored and stable in air. The ligand acts as dibasic tetradentate nature and forms 1 : 1 (metal : ligand) complexes with the metal ion. The thermal behavior of metal complexes show that the hydrated complexes lose molecules of hydration first; followed by decomposition of ligand molecules in the subsequent steps. The solid-state electrical conductivity of ligand and its complexes have been measured over a wide range of temperature in their compressed pellet form and the complexes are found to be of semiconducting in nature. The ligand and its complexes have also been tested for their antimicrobial behavior against various microorganisms and all complexes show a good activity