Bis(trifluoromethyltellurato(0))metallates(I) of copper, silver and gold, [M(TeCF3)2]− (M = Cu, Ag, Au)

Ligand exchange reactions of [NMe4]TeCF3 and CuBr, Ag[BF4] and AuCl have been studied in molar ratios of 2:1. While evidence is found for [Cu(TeCF3)2]− moieties by 19F-NMR spectroscopic and mass spectrometric means, [NMe4][Ag(TeCF3)2] and [NMe4][Au(TeCF3)2] were isolated. After cation exchange, the latter compounds were fully characterised as the [PNP] salts ([PNP] = bis(triphenylphosphoranylidene)ammonium). The single crystal structure of [PNP][Au(TeCF3)2] has been elucidated by XRD measurements (P21/a; a = 1765.6(1), b = 1126.0(1), c = 2055.2(1) pm; β = 111.98(1)°; Z = 4).