COPPER(II) COMPLEXES OF BENZENE-1,2-DIOXYACETIC ACID (BDOAH(2)) - X-RAY CRYSTAL-STRUCTURE OF [CU-2(BDOA)(PHEN)(4)]BDOA-CENTER-DOT-13H(2)O (PHEN=1,10-PHENANTHROLINE)

Copper(II) acetate reacts with benzene-1,2-dioxyacetic acid (bdoaH(2)) in aqueous media to give [Cu(bdoa)(H2O)(2)] (1). Complex 1 reacts with the N-donor ligands pyridine (py), ammonia and 1,10-phenanthroline (phen) to give [Cu(bdoa)(NH3)(2)].H2O (2), [Cu(bdoa) (py)(2)].H2O (3) and [Cu-2(bdoa)(phen)(4)]bdoa.(H2O)-H-13 (4), respectively. The X-ray crystal structure of the dicopper(II,II) complex 4 shows each copper atom at the centre of a distorted trigonal bipyramid comprising four nitrogen atoms from two chelating phen ligands and a single oxygen atom from one of the carboxylate moieties of the bridging bdoa(2-) ligand. The cyclic voltammogram of 4 shows a single reversible wave for the Cu2+/Cu+ couple at E(1/2) = +115 mV (vs Ag/AgCl). Spectroscopic and magnetic data for the complexes are given.