Syntheses and characterization of copper(II) complexes of bis(acetylacetone)trimethylenediimine

Copper(II) complexes [Cu(acactn)H2O](2) (1) and [Cu-2(acactn)(2)KClO4](2) (2), where H(2)acactn is a tetradentate Schiff base bis(acetylacetone)trimethylenediimine, have been prepared and characterized by IR, CV and X-ray single crystal structure analyses. The ligand H(2)acactn is strongly metallophilic to stabilize Cu(II) ion with a square planar N2O2 coordination environment. Complex 1 can be seen as a hydrogen-bonded dimer of building block Cu(acactn) via bridging water molecules, while complex 2 is a tetrametric adduct of [Cu(acactn)] moiety and KClO4, in which K+ and ClO4- are the bridging-groups. Electrochemical studies displayed that Cu(II)/Cu(I) is an irreversible one-electron reduction process. (C) 2001 Elsevier Science B.V. All rights reserved.