Trinuclear Au2Ag and Au2Cu Complexes with Mesityl Bridging Ligands. X-ray Structure of the Chain Polymer [{Au(μ-mes)AsPh3}2Ag](ClO4)

The reaction of the complex [Au(mes)L] (mes = mesityl, L = PPh 3, AsPh 3 ) with Ag(OSO 2 CF 3 ), Ag(OClO 3 ), or [Cu(CNMe) 4 ]PF 6, in molar ratio 2:1, affords trinuclear derivatives [{Au(μ-mes)L} 2 M]A [M = Ag, L = PPh 3, A = SO 3 CF 3 - ( 1 ); L = AsPh 3, A = ClO 4 - ( 2a ), SO 3 CF 3 - ( 2b ); M = Cu, A = PF 6 -, L = PPh 3 ( 3 ), AsPh 3 ( 4 )]. Complexes 1 and 2 react further with various ligands in a 1:1 molar ratio to give the dinuclear compounds [AuAg(μ-mes)(PPh 3 )L]SO 3 CF 3 (L = PPh 3, tetrahydrothiophene, 2,2‘-bipyridine, or SPPh 3 ) or [AuAg(μ-mes)(AsPh 3 )L]A (L = AsPh 3, A = SO 3 CF 3 -; L = 1 / 2 Ph 2 AsCH 2 AsPh 2, A = ClO 4 - ). The structure of [{Au(μ-mes)AsPh 3 } 2 Ag](ClO 4 )( 2a ) has been determined by a single-crystal X-ray diffraction study, which shows an Au−Ag distance of 2.7758(8) Å; the trinuclear species are connected by short Au···Au contacts of 3.132 Å to form a chain polymer.