Abstract
Clustered Co/sup 2 +/ ions present in large amounts at the surface of concentrated MgO-CoO solid solutions are readily reduced at room temperature CO with formation of Co(CO)/sub 4//sup -/ and carbonate-like species. The Co(CO)/sub 4//sup -/ species anchored to the surface are under a distorted C/sub 2..mu../ symmetry. The entity of the distortion can be changed by coadsorbing on the surface lone-pair-containing molecules which, being able to solvate the surface Mg/sup 2 +/ ions, efficiently shield their electric fields. The vibrational assignment of the Co(CO)/sub 4//sup -/ species has been made on the basis of a complete set of isotopic substitution experiments.
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