Complexes of Gold(I) with a Chiral Diphosphine Ligand: A Polymer with Both Au···Ag and Ag···Ag Metallophilic Bonds

Abstract

The chemistry of gold(I) with the ligand binap = 2,2'-bis(diphenylphosphino)-1,1' -binaphthyl is reported. Reaction of [Au2Cl2(μ-binap)] with silver trifluoroacetate gave the corresponding complex [Au2(O2CCF3)2(μ-binap)], and crystallization in the presence of excess silver trifluoroacetate gave the unusual syndiotactic polymeric complex [{Au2Ag2(μ-O2CCF3)4(μ-binap)}n], which contains both Au・ ・ ・Ag and Ag・ ・ ・Ag metallophilic bonds. The trifluoroacetate ligands in [Au2(O2CCF3)2(μ- binap)] can be replaced by nitrogen or phosphorus donor ligands to give complexes [Au2(κ1-4,4'- bipyridine)2(μ-binap)](CF3CO2)2 or meso-[Au2(μ-binap)2](CF3CO2)2