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Carbon−Nitrogen Bond Formation from the Reaction of Ammonia with Dicarbon on the Pt(111) Surface

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journal contribution
posted on 15.11.2007, 00:00 by Rongping Deng, Michael Trenary
The reaction of NH3 with C2 molecules on a Pt(111) surface was investigated using temperature programmed desorption, X-ray photoelectron spectroscopy (XPS), and reflection absorption infrared spectroscopy. Surface C2, which was prepared by dissociative adsorption of acetylene (C2H2) at 750 K, reacts with NH3 to form C−N bonds as revealed by the desorption of HCN and C2N2 at 570 and 650 K, respectively. The formation of C−N bonds was also detected with XPS when the NH3/C2 layer was annealed from 85 to 200 K through the appearance of a chemically shifted C 1s peak at 286.5 eV, which is well-resolved from the unreacted C 1s peak at 284.3 eV. Comparison of calculated and experimental RAIRS data indicates that C−N bond formation involves an HCCNH2 surface intermediate.