Monoorganomercury and diorganothallium derivatives of 2-thiobarbituric acid

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Compounds of type R n MH 2Tb (R = Me, Ph; n = 1 (M = Hg), 2 (M = Tl), H 3Tb = 2-thiobarbituric acid) have been prepared, and studied by vibrational (IR and Raman) and NMR ( 1H, 13C, 199Hg and 205Tl) spectroscopy. The organomercury derivatives have the metal bound to the deprotonated thiol sulphur atom of the ligand in both the solid state and in DMSO solution. The organothallium compounds, however, while having the metal bound to the sulphur atom and possibly to one of the nitrogen atoms of the ligand pyrimidine ring in the solid state, in DMSO form conducting solutions containing H 2Tb − and R 2Tl + ions.