SYNTHESIS AND STRUCTURE OF AQUA-2',2'''-(2,6-PYRIDINDIYLDIETHYLIDENE)DIOXAMOHYDRAZIDE-COPPER(II) HYDRATE

In a template synthesis from copper(II) acetate, 2,6-diacetylpyridine, and semioxamazide (NH2CO CONHNH2), two new copper(II) complexes, [Cu( dapsox)(H2O)]. H2O and [Cu(Hdapsox)(H2O)]ClO4, (where H(2)dapsox = ''' -(2,6-pyridindiyldiethylidene)dioxamohydrazide) were obtained and char acterized. The structure of the former complex was determined by a sin gle-crystal X-ray analysis. Cu-II is located in a square pyramidal env ironment. The polydentate ligand, dapsox(2-), is coordinated in dianio nic form, as an unsymmetrical quadridentate planar system forming one six-membered and two five-membered metal-chelate rings. The fifth coor dination site is occupied by a water molecule. (C) 1997 Elsevier Scien ce Ltd.