Crystal and molecular structure of dichlorotris-[1,2-bis(diphenylphosphino)ethane]dicopper(I)–bisacetone

Abstract

The crystal structure of the title compound, Cu2Cl2(dppe)3,2(C3H6O), has been determined from counter data. Crystals are monoclinic, space group P21/c, with Z= 2 in a unit cell of dimensions: a= 12·57(1), b= 22·09(2), c= 16·42(1)A, β= 121·28(12)°. The structure was solved from 1429 independent reflections and refined to R 0·062. It consists of dinuclear centrosymmetric Cu2Cl2(dppe)3 molecules and of disordered acetone molecules in a ratio 1:2. The copper atoms are tetrahedrally co-ordinated to a chlorine and three phosphorus atoms. Two of the three diphosphine ligands are chelating, one for each copper atom, whereas the third one bridges the tow metal atoms. Cu–Cl is 2·312(4)A, and Cu–P are 2·291(5), 2·311(4), and 2·284(6)A. The Cl–Cu–P and P–Cu–P angles exhibit large deviations from the ideal value. The conformation of the chelating diphosphine and the distortions in the tetrahedral co-ordination of the copper atoms are discussed.