The coordination chemistry of divalent cobalt, nickel and copper Part 14. The characterisation of copper complexes with potentially bidentate ligands having phosphorus oxide and tertiary amine donor groups: a crystal structure of chlorobis( P-( N, N-dimethylaminomethyl)- P, P-diphenylphosphine oxide)copper(II) Tetrachlorocuprate(II)

Abstract

The three ligands P-dimethylaminomethyl- P-phenylphosphinic acid, dapa, P-( N, N-dimethylaminoethyl)- P, P-diphenylphosphine oxide, depo, and P- N, N-dimethylaminomethyl)- P, P-diphenylphosphine oxide, dmpo, were prepared. Copper complexes were isolated and characterised. The coordination sphere of Cu(dapa) 2·H 2O was assigned a distorted octahedral symmetry consisting of two amine nitrogen, one water oxygen and three phosphinic acid oxygen atoms, the phosphinic acid group of one dapa ligand being coordinated to two copper atoms. Compound CuCl 3(H·depo) was found to have a distorted tetrahedral chromophore containing the three chlorine and an amine nitrogen as donor atoms. A crystal structure determination was performed on (CuCl 2) 3(dmpo) 4; tetragonal, space group P 4 2 1 c, a = b = 15.330(2), c = 13.992(4) Å, Z = 2. The compound consisted of two penta-coordinate [Cu(dmpo) 2Cl] + cations and a tetragonally distorted CuCl 4 2− anion. The symmetry of the chromophores of the cations was highly distorted square pyramidal, the donor atoms being the phosphine oxide oxygen and amine nitrogen from each of two dmpo ligands and the chlorine atom. An analogous structure was assigned to (CuBr 2) 3(dmpo) 4.