METAL-ALPHA,OMEGA-DICARBOXYLATE COMPLEXES .1. QUA(2,2'-BIPYRIDYL-N,N')(MALONATO-O,O')-COPPER(II) MONOHYDRATE

The title compound, [Cu(C3H2O4)(C10H8N2)(H2O)].H2O, exists as discrete monomers. The Cu-II ion is square pyramidal, with two N atoms of the bipyridyl ligand and two O atoms, one from each of the carboxylates of the folded dibasic acid, providing the base and a water molecule form ing a long apical bond [Cu-O5 2.523 (3) Angstrom]. The 'scorpion-like' complex possesses a plane of symmetry bisecting the molecule lengthwi se, the non-planarity arising from severe puckering of the six-membere d chelate ring of the acid. Hydrogen-bonding interactions between the water molecules and the carboxylate O atoms stabilize the crystal stru cture.