Supramolecular Polymers and Chiral Phosphine Oxides by Oxidation of Gold(I) Complexes

Abstract

The chiral diphosphine ligand R,R-cyclo-C6H10-trans-1,2-{NHC(=O)C6H4-2-PPh2}2, 1, forms complexes with gold(I) of formula [Au(1)]Cl, 2, and [(ClAu)2(µ-1)], 3, in which the diphosphine acts as a trans-chelate and bridging ligand, respectively. Oxidation of these gold(I) complexes leads to dissociation and oxidation of the diphosphine ligand to form the corresponding diphosphine dioxide R,R-cyclo-C6H10-1,2-{NHC(=O)C6H4-2-P(=O)Ph2}2, which has been crystallized in its protonated form and as complexes with Na+ and Fe2+, with [AuBr2]− or [AuBr4]− anions. Some of these compounds form supramolecular polymers by intermolecular hydrogen bonding.