Reaction of dimethylthallium(III) acetate and isatin-3-thiosemicarbazone. Crystal and molecular structure of dimethyl(dimethylsulfoxide)(isatin-3-thiosemicarbazonato)-thallium(III)

The reaction of dimethylthallium(III) acetate and isatin-3-thiosemicarbazon e (HisaTSC) afforded [T1Me(2)(isaTSC)], which recrystallised from DMSO as [ T1Me(2)(isaTSC)(DMSO)]. In this crystal the T1 atom is bound to the S, N(3) and O atoms of an N(2)-deprotonated thiosemicarbazone ligand, to the O of a DMSO molecule, and to the two methyl C atoms. An additional T1 ... O-isaT SC interaction with a neighbouring molecule gives rise to a weakly bonded d imer in which the thallium atoms have distorted pentagonal bipyramidal envi ronments. The changes induced in the solid-state IR spectrum of the free li gand by deprotonation and coordination are analysed and the H-1, C-13 and N -15 NMR spectra are also discussed. (C) 2000 Elsevier Science S.A. All righ ts reserved.