Structural studies of binuclear and trinuclear complexes involving silver and gold with bridging 2,2′;6′,2″-terpyridine ligands

Abstract

Mixing a dichloromethane solution of either Ag(AsF6) or Ag(SbF6) with a dichloromethane solution containing an a mixture of 2,2′;6′,2″-terpyridine (Tpy) and either (Ph3P)AuCl, (Et3P)AuCl, or (C6H11NC)AuCl followed by filtration and addition of diethyl ether to the filtrate produced colorless crystals of the products (1, [Ph3PAu(μ-Tpy)AgTpy](AsF6)2•0.5CH2Cl2·0.5H2O; 2, [(Et3PAu(μ-Tpy)AgTpy)](AsF6)2; 3, [({Et3PAu(μ-Tpy)}2Ag)](SbF6)3·0.5CH2Cl2; and 4, [C6H11NCAu(μ-Tpy)AgTpy](AsF6)2). Crystallographic studies of these salts showed that the gold(I) ion coordinated to the terminal pyridyl group of a bridging Tpy ligand and the phosphine or isocyanide ligand in a nearly linear fashion. The bridging Tpy ligand coordinated to a silver(I) ion that was also bonded to a second, non-bridging Tpy ligand, except in the case of the trinuclear complex, 3, [({Et3PAu(μ-Tpy)}2Ag)](SbF6)3·0.5CH2Cl2 where there are two bridging Tpy ligands.