Preparation, structures and properties of dinuclear and trinuclear copper(II) complexes bridged by one oximato and one hydroxo ligands

Abstract

The dinuclear and trinuclear copper(II) complexes [Cu 2(L)(OH)(ClO 4)(phen)(H 2O)]ClO 4 · [Cu 2(L)(OH)(ClO 4) 2(phen)(CH 3OH)] ( 1) and [Cu 3(L) 2(OH) 2(H 2O) 2](NO 3) 2 ( 2) (HL=2-[2-(α-pyridyl)ethyl]imino-3-butanone oxime and phen=1,10-phenanthroline) were prepared and their crystal structures have been determined by X-ray crystallography. Complex 1 is composed of [Cu 2(L)(OH)(ClO 4)(phen)(H 2O)]ClO 4 ( 1a) and [Cu 2(L)(OH)(ClO 4) 2(phen)(CH 3OH)] ( 1b). In 1a and 1b, one oximato of L and one hydroxo group bridge two copper(II) ions. The linear trinuclear cation [Cu 3(L) 2(OH) 2(H 2O) 2] 2+ in 2 is centrosymmetric, and one oximato and one hydroxo group bridge the central and terminal copper(II) ions. The strong antiferromagnetic interactions within the dinuclear and trinuclear complexes 1 and 2 have been observed (2 J=∼−900 cm −1 for 1 and 2, respectively, H=−2 JS 1· S 2).