Clustered Co2+ ions present in large amounts at the surface of concentrated MgO-CoO solid solutions are readily reduced at room temperature by CO with formation of Co(CO)4- and carbonate-like species. The Co(CO)4- species anchored to the surface are under a distorted C2v, 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 Mg2+ ions, efficiently shield their electric fields. The vibrational assignment of the Co(CO)4- species has been made on the basis of a complete set of isotopic substitution experiments.
Spectroscopic study of CO adsorption on CoO-MgO solid solutions. 3. CO adsorption on aggregated Co2+ ions
ZECCHINA, Adriano;SPOTO, Giuseppe;GARRONE, Edoardo;
1984-01-01
Abstract
Clustered Co2+ ions present in large amounts at the surface of concentrated MgO-CoO solid solutions are readily reduced at room temperature by CO with formation of Co(CO)4- and carbonate-like species. The Co(CO)4- species anchored to the surface are under a distorted C2v, 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 Mg2+ ions, efficiently shield their electric fields. The vibrational assignment of the Co(CO)4- species has been made on the basis of a complete set of isotopic substitution experiments.
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