A RAIRS study of propanone adsorption on a Pt0.25Rh0.75(111) alloy single crystal

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Polymers, Organic Compounds

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Monolayer and multilayer films of propanone adsorbed on an alloy metal single crystal have been studied using RAIRS. Analysis of the relative intensities of modes of different symmetry and comparison with the liquid spectrum leads to a determination of the orientation of the molecule. In the monolayer the molecular plane is close to parallel with the surface. On increasing coverage restructuring of the monolayer occurred due to interaction with the second adsorbed layer. Multilayer spectra show the propanone molecule to be orientated with the C=O axis parallel and the molecular plane perpendicular to the surface. IR spectra of considerably thicker films deposited on a KBr plate also show evidence for a strongly preferred molecular orientation with the molecular z axis parallel to the plate and the xy plane perpendicular to the plate.

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