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Complexes of the hydrotris(methimazolyl)borate ligand (Tm) have been prepared with zinc, cadmium and mercury halides. Complexes of type [M(Tm)X] were obtained and characterised by NMR and mass spectrometry. X-ray crystallographic analysis of [Zn(Tm)X] (X = Cl, Br, I) reveals a symmetrical coordination mode of the ligand, but no significant change with different halides, which sit on the approximate C 3 axes of the complexes. The structures of [M(Tm)Br] (M = Cd, Hg) are isomorphous with one another. Again, the ligand

The synthesis and crystal structure of the [bis{hydrotris(methimazolyl)borato}thallium(III)] cation is reported, in which the thallium ion is co-ordinated by six sulfur thione donors in a regular octahedral environment