Summary
The preparation of transition metal complexes containing the sterically hindered ligand, bis(3,5-dimethylpyrazolyl)methane (LL) is described. Compounds of formula M(LL)X2 (M = CoII, NiII or ZnII and X = Cl− or Br−) or M(LL)2X2 (M = MnII, FeII, CoII, NiII, CuII, ZnII or CdII and X = ClO −4 ; M = CoII, NiII, CuII or ZnII and X = NO −3 ; M = NiII or CuII and X = Cl− or Br−) have been isolated. In addition, an apparently trimeric Cu3(LL)4Cl6 · EtOH compound is reported. For Ni(LL)Cl2 a five-coordinated chloro-bridged dimer is found. The perchlorato compounds, M(LL)2(ClO4)2, appear to have one bidentate ClO −4 and one ionic ClO −4 group. The M(LL)2 species appears to occur either in octahedral geometry, leaving twocis-positions free, or in a tetrahedral geometry without space for other ligands, and probably also in a five-coordinate geometry with one free ligand position.
Structural conclusions are drawn from i.r., far-i.r. and ligand-field spectra, x-ray powder patterns, magnetic susceptibility data, e.s.r. spectra and conductivity data.
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Reedijk, J., Verbiest, J. Coordination compounds derived from transition metal salts and bis(3,5-dimethylpyrazolyl)methane. Transition Met Chem 4, 239–243 (1979). https://doi.org/10.1007/BF00619177
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DOI: https://doi.org/10.1007/BF00619177