SYNTHESIS, CHARACTERIZATION, AND THERMAL STUDIES OF NEW TETRANUCLEAR OXOV ANADIUM(IV)-COPPER(II) COMPLEXES CONTAINING OXALATE AND SULFIDE AS BRIDGING LIGANDS

摘要

The new sulfide bridged-polynuclear complexes Cu_2(VO)_4-(C_2O_4)_4S_2L_4 centre dot nH_2O, where for L = 1, 10-phenanthroline, n = 5 and for L = 2, 10-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 at structure in which four [VO(L)(C_2O_4)(H_2O)] 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.