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The bonding in Ni(CN)4 2- and Ni(C5H5)NO is discussed by means of all-electron ab initio SCF-MO calculations. In the square-planar cyanide the metal-carbon bonds are predominantly of σ character, whilst in Ni(C5H5)NO the Ni-NO bond is of π character and the Ni-C5H5 bond mainly ionic. The mode of co-ordination of the ligands CO, NO, CN- and C5H5 is compared.
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Hillier et al. (1972) studied this question.
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