New routes towards halogeno complexes of gold by halide exchange from [Au2Cl6]. Crystal and molecular structure of triphenylmethylium tetrachloroaurate(III), [CPh3][AuCl4]
Abstract
Anhydrous [Au2Br6] and Aul can be obtained by halide exchange from [Au2Cl6] with RX (X = Br or I, R = H or alkyl). The addition of [Au2Cl6] to CPh3Cl produces the ionic derivative [CPh3][AuCl4] whose crystal and molecular structure has been determined by X-ray diffraction. Crystal data: space group P21/c, a= 8.225(3), b= 14.671(6), c= 16.738(8)Å, β= 97.85(2)° and Z= 4. Other organic chlorides RCl (R = Pr, SiMe3 or But) react with [Au2Cl6] with a partial reduction to the mixed-valence chloride [Au4Cl8]. Addition of [Au2Cl6] to anhydrous iron(III) chloride produced a mass-spectrometrically active mixed iron–gold species.