Synthesis and NMR spectroscopic investigation of salts containing the novel [Au(CF3)nX4−n] (n=4-1, X=F, CN, Cl) anions

First examples for the syntheses of trifluoromethyl transition metal complexes by conversion of a cyano into a trifluoromethyl ligand are described. The fluorination of ]Au(CN)₄] with ClF in CH₂Cl₂ leads to the formation of a mixture of gold complexes of the type AuF_xCl_y(CF₃)_4−x−y]⁻ (x=0-4, y=0-2). Ligand exchange reactions of AuF_xCl_y(CF₃)_4−x−y]⁻ (x=0-4, y=0-2) with (CH₃)₃SiY (Y=Cl, CN) are performed resulting in anions of the type AuY_x(CF₃)_4−x]⁻ (x=0-4). All products are characterised by - and NMR spectroscopy.