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Infrared spectra and structures of anionic complexes of cobalt with carbon dioxide ligands
Benjamin J Knurr1, J Mathias Weber
1JILA and Department of Chemistry and Biochemistry, University of Colorado , Boulder, Colorado 80309, United States.
Abstract:
We present infrared photodissociation spectra of [Co(CO2)n](-) ions (n = 3-11) in the wavenumber region 1000-2400 cm(-1), interpreted with the aid of density functional theory calculations. The spectra are dominated by the signatures of a core ion showing bidentate interaction of two CO2 ligands with the Co atom, each forming C-Co and O-Co bonds. This structural motif is very robust and is only weakly affected by solvation with additional CO2 solvent molecules. The Co atom is in oxidation state +1, and both CO2 ligands carry a negative charge.
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