Synthesis and characterization of Mn(II), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) polychelates of the Schiff base derived from dihydroxydibenzoyl biphenyl and butanedionedihydrazone

New coordination polychelates of manganese(II), cobalt(II), nickel(II), cop per(II), zinc(II) and cadmium(II) with the Schiff base derived from 4,4'-di hydroxydibenzoyl biphenyl and 2,3-butanedionedihydrazone have been synthesi zed and characterized by elemental analysis, electronic and IR spectra, mag netic susceptibility, thermal analysis and D.C. electrical conductivity. Th e Schiff base behaves as a dibasic, tetradentate ligand coordinating throug h an ONNO system and forms chelates with general formula of [ML . xH(2)O], (where x = 1 or 2). The thermogravimetric studies indicate a two stage deco mposition and the presence of water molecules. Using thermal decomposition data, different kinetic and thermodynamic parameters have also been evaluat ed. D.C. electrical conductivity was measured over a wide range of temperat ure in a pellet form. The Schiff base and its polychelates have also been t ested for their antimicrobial activities.