A systematic search of the Cambridge Crystallographic Database has yielded structures of 467 molecules containing, or reported to contain, a molybdenum to molybdenum quadruple bond, Mo-4Mo. We have arranged these data as a histogram, in order to determine the "normal" range of Mo-4Mo lengths, 2.06-2.17 Å, as well as to examine molecules in which the Mo-4Mo length deviates from the norm. We discuss 24 molecules with exceptionally long Mo-4Mo lengths. Another molecule, Mo2(pyNC(O)CH3)4, was previously reported to have an unusually short Mo-4Mo bond. However, the structure is highly disordered (probably twinned); thus we have prepared and determined the structure of an analogous molecule, Mo2(pyNC(O)CH2CH3)4, which displays a completely normal Mo-4Mo bond length of over 2.08 Å.
CITATION STYLE
Cotton, F. A., Daniels, L. M., Hillard, E. A., & Murillo, C. A. (2002). The lengths of molybdenum to molybdenum quadruple bonds: Correlations, explanations, and corrections. Inorganic Chemistry, 41(9), 2466–2470. https://doi.org/10.1021/ic025508c
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