Mono-organomercury and diorganothallium derivatives of thiohydantoin and 5-(benzylidene)-2-thiohydantoin: The crystal structure of dimethyl-[5-(benzylidene)-2-thiohydantoinato]-thallium(III)

The complexes [TIR2(Td)], [TIR2(BTd)], [HgR(Td)] and [HgR(BTd)] (R = Me, Ph ; HTd = thiohydantoin; HBTd = 5-(benzylidene)-2-thiohydantoin) were prepare d by reacting the appropriate ligand with the appropriate diorganothallium hydroxide or mono-organotnercury acetate. They have been studied in the sol id state (by vibrational spectroscopy and mass spectrometry) and in solutio n (by using NMR). In addition, the crystal structure of [TlMe2(BTd)] has be en determined by X-ray diffraction. The crystals have a polymeric structure in which each thallium atom is coordinated to the two methyl C atoms, the S and N atoms of one BTd ligand, the S atom of another and the O atom of a third. The coordination modes of the two ligands in the other complexes are discussed on this basis in the light of spectroscopic data.