DIMETHYLTHALLIUM(III) COMPOUNDS OF DIPHENYL DITHIOPHOSPHINATE - CRYSTAL AND MOLECULAR-STRUCTURE OF [TLME2(S2PPH2)] AND [ET4N][TLME2(S2PPH2)2]

The title compounds have been prepared by the reaction of TlMe2X and [R4N][S2PPh2] (X = OH or NO3, R = H or Et, respectively) in water/ethanol or chlorofom. Monocrystals of [TlMe2(S2PPh2)] (1) and [Et4N][TlMe2(S2PPh2)2] (2) were obtained from solution in chloroform for X-ray studies. Dimethyl(diphenyldithiophosphinato)-thallium(III) (1) crystallizes with two independent molecules per asymmetric unit, in both of which the metal is coordinated to two methyl groups, two sulphur atoms belonging to a single bidentate dithiophosphinate ligand and, weakly, to two sulphur atoms belonging to two neighbouring molecules. In tetraethylammonium dimethyl[bis(diphenyldithiophosphinato)]thallato(III) (2) the thallium atom is coordinated to two methyl groups and two anisobidentate dithiophosphinate ligands, with no detectable intermolecular interactions. Spectroscopic properties of the new compounds [mass, IR, Raman and multinuclear (H-1, C-13, P-31 and Tl-205) NMR spectra] are also discussed.