摘要 : Complexes ofthe 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 a... 展开 Complexes ofthe 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 structure of [M(Tm)Br] (M = Cd, Hg) are isomorphous with one another. Again, the ligand is symmetrically coordinated to the metal, but the halide is now significantly displaced from the approximate C_3 axis of the M(Tm) unit, resulting in what approximates to a trigonal pyramidal geometry. Unlike in most distorted mercury structures, little bond length expansion (towards two- or three-coordinategeometries) occurs. This is ascribed to the strong affinity of the thione donors for Hg. 收起