Abstract
The formation of π-bonded ethylene on a nitrogen-covered Pt(111) surface was studied by reflection absorption infrared spectroscopy (RAIRS) and temperature-programmed desorption (TPD). The observation with RAIRS of a peak at 975 cm−1 due to the ═CH2 wagging (out of plane) mode is a clear indication of the presence of π-bonded ethylene on the surface. This form of ethylene desorbs from the surface at 216 K, a temperature much lower than ethylene desorption from the clean surface. Density functional theory calculations confirm that π-bonded C2H4 becomes thermoneutral compared with di-σ C2H4 when 0.25 ML of N atoms are coadsorbed on the Pt(111) surface.
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