Methylmercury and dimethylthallium complexes of 5-(4 '-dimethylaminobenzylidene)-2-thiohydantoin (HDABTd) - The crystal and molecular structures of HDABTd and [TlMe2(DABTd)(DMSO)]

The ligand 5-(4'-dimethylaminobenzylidene)-2-thiohydantoin (HDABTd) was pre pared and its structure determined by X-ray diffraction. In the crystal, li gand molecules are linked in chains along the [110] direction by intermolec ular N(3)-H(3)... O(1)(1) and N(1)-H(1)... S-ii hydrogen bonds. The complex es [HgMe(DABTd)] and [TlMe2(DABTd)] were prepared by reaction of the ligand with methylmercury acetate or dimethylthallium hydroxide, and were charact erized in the solid state by IR spectroscopy and in solution by conductivit y measurements and H-1, C-13, Hg-199 and Tl-205 NMR spectroscopy The dimeth ylthallium complex crystallized in DMSO solution as [TlMe2(DABTd)(DMSO)], a n X-ray diffraction study of which showed its thallium atoms to be coordina ted to the two methyl C atoms, the oxygen atom of a DMSO molecule, the S an d N(1) atoms of one DABTd ligand and, more weakly, to the oxygen atom of a neighbouring DABTd. This last interaction links the molecules of the comple x in chains parallel to the b axis. Crystals of the methylmercury(II) compl ex contain three [HgMe(DABTd)] DMSO structures per asymmetric unit, but poo r data quality prevented complete refinement. (C) 1999 Elsevier Science Ltd . All rights reserved.