Crystal and molecular structure of di-µ-[4,6,6-trimethyl-3,7-diazanon-3-ene-1,9-diolato(1—)-ONN′,µ-O′]-dicopper(II) diperchlorate

Abstract

The structure of the title compound, formed by reaction of copper(II) perchlorate, 2-aminoethanol, and acetone, has been determined by X-ray diffractometry. It is monoclinic, space group P2₁/c, a= 8.4495(6), b= 23.612(5), c= 8.3041(8)Å, and β= 115.43(1)°; R= 0.066. The compound contains centrosymmetric di-µ-oxo-bridged dimeric cations, with the copper atoms in distorted square-pyramidal co-ordination. The bridging oxo-groups, and the amine and imine donor groups, are co-ordinated in the basal plane and the hydroxyl group of the quadridentate ligand is co-ordinated in the apical site. An analogous compound with the ligand 5,7,7-trimethyl-4,8-diazaundeca-4-ene-1,11-diol has been prepared from copper(II) perchlorate, 3-aminopropan-1-ol, and acetone. This is diamagnetic, or nearly so, implying complete spin pairing via the di-µ-oxo bridge, although spin pairing of the title compound is not significant.