Some metal complexes containing diphenylphosphinoacetic acid as a P-bonded neutral ligand. Crystal structures of [AuCl(Ph 2PCH 2CO 2H)] and trans- [PdCl 2(Ph 2PCH 2CO 2H) 2]0.33H 2O · 0.33C 2H 5OH

Abstract

Diphenylphosphinoacetic acid (HA) reacts as a neutral P-donor ligand with a variety of transition metal compounds to generate the new complexes [CuCl(HA) x ] ( x=1 or 3), trans-[PdCl 2(HA) 2], cis-[PtCl 2(HA) 2], [AuCl(HA)] and cis-[Mo(CO) 4(HA) 2]. The crystal structure of [AuCl(HA)] involves a linear Cl–Au–P arrangement [179.0(1)°], neighbouring molecules forming hydrogen-bonded dimers in the lattice array. The hydrogen-bonding is of the planar type commonly found in free carboxylic acids with intermolecularly bonded pairs of [AuCl(HA)] molecules being related by an inversion centre. Recrystallisation of trans-[PdCl 2(HA) 2] from ethanol yields crystals of the solvate trans-[PdCl 2(HA) 2] · 0.33H 2O · 0.33C 2H 5OH. The asymmetric unit contains 1.5[PdCl 2(HA) 2] molecules along with water and ethanol molecules exhibiting only half site occupancy. For every three [PdCl 2(HA) 2] molecules two are hydrogen-bonded to neighbours using carboxylic acid groups to form chains. The third molecule differs in that hydrogen-bonding occurs between one oxygen of a carboxylic acid group and the lattice water, the oxygen of which further hydrogen-bonds to the lattice ethanol.