In order to aid assignment of Co-C bond stretching vibrational frequency of CH&o@H)2H20 @H=dimethylglyoximato monanion) in IR and Raman spectra, its isotopic substitution CD&o(DH)zH20 has been synthesized and normal coordinate analyses on the two complex have been made. The bands were assigned in terms of potential energy distribution. The results provide definitive band assignment of the Co-C bond and Co-N bond stretching modes which are coupling at 511 cm-'.
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