AN INFRARED-SPECTROSCOPIC STUDY OF METHYL IODIDE AND METHYLENE IODIDE ON Ag(111)

G. Wu, D. Stacchiola, M. Collins and W. T. Tysoe ()
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G. Wu: Department of Chemistry and Laboratory for Surface Studies, University of Wisconsin–Milwaukee, Milwaukee, WI 53211, USA
D. Stacchiola: Department of Chemistry and Laboratory for Surface Studies, University of Wisconsin–Milwaukee, Milwaukee, WI 53211, USA
M. Collins: Department of Chemistry and Laboratory for Surface Studies, University of Wisconsin–Milwaukee, Milwaukee, WI 53211, USA
W. T. Tysoe: Department of Chemistry and Laboratory for Surface Studies, University of Wisconsin–Milwaukee, Milwaukee, WI 53211, USA

Surface Review and Letters (SRL), 2001, vol. 08, issue 03n04, 303-312

Abstract: The adsorption of methylene iodide and methyl iodide is studied on Ag(111) using reflection-absorption infrared spectroscopy. Molecular methylene iodide adsorbs in a random orientation at 80 K and converts into a species with the H–C–H plane adsorbed perpendicular to the surface on heating to 155 K, and also dissociates into iodomethyl species. These undergo further decomposition eventually to form ethylene, although no methylene species are detected on the surface. Methyl iodide forms both multilayers and a metastable state on Ag(111) at 180 K, where the C–I axis of the metastable state is oriented nearly parallel to the surface. Infrared data suggest that the metastable state both desorbs almost simultaneously with the multilayer and converts to adsorbed methyl iodide with the C–I axis oriented nearly perpendicular to the surface. The latter species decomposes into adsorbed methyl fragments and adsorbed iodine where the frequency of the methyl bending mode forCH3(ads)and forCH3I(ads)are identical at1230 cm-1.

Date: 2001
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DOI: 10.1142/S0218625X01001099

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