XPS Studies of the Partial Hydrogeneration of Cyanogen on Pt(111): Comparison with HCN and Ethylenediamine

摘要

Coadsorption of C2N2 and H2 on Pt(111) at temperatures es above 250 K results in a surface partially hydrogenated surface species. The x-ray photoelectron spectra of this species as well as HCN and ethylenediamine have been obtained, as a function of surface temperature. The partially hydrogenated cyanogen has a N1s binding energy of 399.3eV, the same as is obtained for partially dehydrogenated ethylenediamine. This is substantially different from the N1s binding energies obtained for HCN adsorbed on Pt (111) which are 397.0 and 398.8eV. These results strongly favor a di-imine structure for the surface intermediate formed from coadsorption of H2 and C2N2 on Pt (111). Keywords: Photoelectron spectroscopy; Cyanogen; Hydrogenation; Ethylenediamine. (jes)