SYNTHESIS, CHARACTERIZATION, AND THERMAL STUDIES OF NEW TETRANUCLE AR OXOVANADIUM(IV)-COPPER(II) COMPLEXES CONTAINING OXALATE AND SULFIDE AS BRIDGING LIGANDS

The new sulfide bridged-polynuclear complexes Cu2(VO)4- (C2O4)4S2L4ċnH2O, where for L=1, 10-phenanthroline, n=5 and for L=2, l0-bipyridine, n=7, have been synthesized and characterized by elemental and thermal analyses, electronic and IR spectroscopy. These data as well as magnetic moments and EPR spectra strongly support a structure in which four [VO(L)(C2O4)(H2O)] units act as ligands toward the two copper(II) centers through the oxalate anion. Each of the oxalate anions act as a tridentate ligand and the core of the complexes involve a copper-sulfide-copper moiety.