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), copper(II), zinc(II) and cadmium(II) with the Schiff base derived from 4,4'-dihydroxydibenzoyl biphenyl and 2,3-butanedionedihydrazone have been synthesized and characterized by elemental analysis, electronic and IR spectra, magnetic susceptibility, thermal analysis and D.C. electrical conductivity. The Schiff base behaves as a dibasic, tetradentate ligand coordinating through 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 decomposition and the presence of water molecules. Using thermal decomposition data, different kinetic and thermodynamic parameters have also been evaluated. D.C. electrical conductivity was measured over a wide range of temperature in a pellet form. The Schiff base and its polychelates have also been tested for their antimicrobial activities.