Synthesis and coordination chemistry of gold(I) acetylides.: The solid-state structure of {[η2-(Ph3P)AuC≡CFc]Cu(μ-Cl)}2

The gold(I) acetylide (Ph3P)AuC drop CC6H3(CH2NMe2)(2)-3,5 (3) is accessible by the reaction of (Ph3P)AuCl (1) with HC drop CC6H3(CH2NMe2)(2)-3,5 (2) in a 1:1 molar ratio. Base-catalyzed desilylation of (Ph3P)AuC drop CSiMe3 (4) produces the homobimetallic gold(I) species (Ph3P)AuC drop CAu(PPh3) (5). However, the intermediate formation of(Ph3P)AuC drop CH could not be evidenced, but is most likely. The coordination chemistry of 5 and (Ph3P)AuC drop CFc (6) toward different copper(I) halides [CuX](n) (7a, X = Cl; 7b, X = Br) is presented. While heterodinuclear 6 affords with equimolar amounts of 7a hexanuclear {[eta (2)-(Ph3P)AuC drop CFc]Cu(mu -Cl)}(2) (8), homobinuclear 5 produces with 7b in a 1:1 molar ratio via ligand exchange polymeric [CuC dropC](n) (10) and mononuclear (Ph3P)AuBr (11). A feasible reaction mechanism for the formation of the latter species is presented. The solid-state structure of 8 is reported. It exhibits a linear array around the gold(I) center and a coplanar arrangement of the Cu2Cl2 and the gold(I) acetylide entities.