Diane Dickie - Tris(carbene)borate Ligands Featuring Imidazole-2-ylidene, Benzimidazol-2-ylidene, and 1,3,4-Triazol-2-ylidene Donors. Evaluation of Donor Properties in Four-Coordinate {NiNO}10 Complexes.

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      Munoz, Salvador B., Foster, Wallace K., Lin, Hsiu-Jung, Margarit,   Charles G., Dickie, Diane A., Smith, Jeremy M. Inorganic   Chemistry 51 (23) 12660-12668

      Abstract: The synthesis and characterization of   new tris(carbene)borate ligand precursors contg. substituted   benzimidazol-2-ylidene and 1,3,4-triazol-2-ylidene donor groups,   as well as a new tris(imidazol-2-ylidene)borate ligand precursor   are reported. The relative donor strengths of the   tris(carbene)borate ligands were evaluated by the position of   ν(NO) in four-coordinate {NiNO}10 complexes, and follow the   order: imidazol-2-ylidene > benzimidazol-2-ylidene >   1,3,4-triazol-2-ylidene. There is a large variation in ν(NO),   suggesting these ligands to have a wide range of donor strengths   while maintaining a consistent ligand topol. All ligands are   stronger donors than Tp* and Cp*. [on SciFinder(R)]

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