SYNTHESIS AND CHARACTERIZATION OF HEAVY METAL COMPLEXES OF 1,5-BIS(2-CARBOXYPHENYL)-3-(2-FURYL)FORMAZAN AND ITS MIXED-LIGAND COMPLEXES WITH 2,2′-DIPYRIDYL

1,5-Bis(2-carboxyphenyl)-3-(2-furyl)formazan (H2BCFF) and its complexes with Zn(II), Cd(II), Hg(II) and Pb(II) and its mixed ligand complexes with 2,2′-dipyridyl with Cd(II), Hg(II) and Pb(II) have been synthesized. The structures, compositions and properties of these compounds were determined by elemental analyses, IR, 1H NMR and UV-Vis. Spectra, molar conductivities and thermal analyses.