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Photoinduced Reactions of a Carbene Precursor with Chemisorbed CO on a Metal Surface: Diphenyldiazomethane on CO-Covered Ru(0001)

2004; American Chemical Society; Volume: 108; Issue: 37 Linguagem: Inglês

10.1021/jp0401877

1520-6106

Markus Gunia, P. Jakob, Wolfram Sander, Christof Wöll,

Advanced Chemical Physics Studies

The adsorption of the carbene precursor diphenyldiazomethane (DPDMA) on clean and CO-precovered Ru(0001) has been investigated using infrared reflection absorption spectroscopy (IRAS). Deposition of DPDMA in a control experiment onto the clean metal surface leads to a cleavage of the diazo group, yielding an upright standing diphenylmethylene species. To inhibit this instant dissociation and to control the state of the carbene precursor, adsorption was studied on a CO-spacer layer on the Ru-surface. The reaction of the photochemically or thermally formed diphenylcarbene with the underlying CO molecules yields a new carbonyl-containing species, which is proposed to be a surface bound diphenylketene.