Photoelectron Spectroscopy Studies of the Hydrogenation of Cyanogen on Pt(111): Comparison with HCN and Ethylenediamine

摘要

X-ray photoelectron spectra as a function of anneal temperature are used to compare the thermally initiated chemistry of cyanogen + hydrogen on Pt(111) with that of C2N2 hydrogen cyanide and ethylenediamine. These spectra show that the product of the reaction of C2N2 with coadsorbed hydrogen (the g state of C2N2 + H2/Pt(111)) is not HCN but is more likely to be a surface di-imine species. The N1s binding energy of this partially hydrogenated species is approx. 399.3 eV. HCN adsorption on Pt(111) leads to two distinct chemical species with N1s binding energies of 399.6 and 396.6 eV which are interpreted in terms of molecular and dissociative adsorption respectively. Reprints. (AW)