Abstract
The physical adsorption of CO onto SiO 2 surfaces containing isolated OH groups results in the formation of two types of physisorbed CO. The first, CO species A, exhibits v CO = 2158 cm −1 and is bound by hydrogen bonding to the SiOH δ+ groups to form a surface complex SiOH δ+ … CO. The strength of this interaction is about 2.7 kcal mol −. The second form of physisorbed CO, CO species B, exhibits v CO = 2140 cm −1, and has pronounced rotational wings. The degree of rotational freedom is determined by the extent of shielding by CO of the polar groups on the surface. At high coverages of physisorbed CO species B, solvent effects due to CO species B on both the OH and CO stretching modes of the SiOH … CO complex are observed to cause small downward shifts in stretching frequency.
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