New ways for the preparation of heterocyclic gold(III) complexes

Abstract

The reaction of 1,2-dimethyl-2,3,4,5-tetraphenylstannacyclopentadiene [(Ph 4C 4)SnMe 2] with AuCl 3(tht) (tht=tetrahydrothiophen) leads to the auracyclopentadiene complexes [(Ph 4C 4)AuCl(tht)] or [(Ph 4C 4)AuCl] 2, which react with Tl(acac) to give the complex [(Ph 4C 4)Au(acac)]. Reaction of the latter with protonated ligands (HXL) or (H 2X 2L 2) leads to the formation of neutral mononuclear or binuclear complexes of the types [(Ph 4C 4)Au(XL)] (where XL is a monoanionic bidentate ligand) or [(Ph 4C 4)Au(X 2L 2)Au(Ph 4C 4)] (where X 2L 2 is a dianionic tetradentate ligand). Reaction of the acetylacetonate complex with ammonium or pyridinium salts (LH +X -) gives the mononuclear neutral complexes [(Ph 4C 4)Au(X)(L)] (X = CH 3COO or CF 3COO; L = NH 3 or py) or the cationic complexes [(Ph 4C 4)AuLL′]X when X is an anion with poor coordinating capacity (X = ClO 4 or BF 4) and the reaction is carried out in the presence of a neutral ligand (L′ = PPh 3).