Raman Spectra of Metal Carbonyl Compounds. IV. Raman Spectra and Structure of Cadmium and Mercury Cobalt Carbonyl

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Abstract
The complete Raman spectrum of Cd[Co(CO)4]2 and a partial one of Hg[Co(CO)4]2, excited by helium radiation in the red and near infrared spectral range, are reported. A salient feature of the observed spectra is the appearance of an intense, strongly polarized shift at 152 (161) cm—1, not found in the spectra of mononuclear metal carbonyls, that must be assigned to the symmetric Cd(Hg)–Co stretching mode. The results exclude the presence of one or more bridging CO groups in the compounds referred to and point strongly to both the existence of a three‐fold principal molecular axis containing the atoms O–C–Co–Cd(Hg)–Co–C–O, and to the staggered D3d configuration of the entire molecule.