A Hreels Tds Study Of The Intermediate Formed By The Reaction Of C2n2 With H2 On Pt 111
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A HREELS/TDS Study of the Intermediate Formed by the Reaction of C2N2 with H2 on Pt(111).
A significant body of work is beginning to appear on the chemistry of amines and organic cyanides on single crystal transition metal surfaces in UHV. In particular, the thermal chemistry of cyanogen (C2N2) adsorbed on single-crystal platinum surfaces has been examined by a number of authors. The results from studies on Pt(100), Pt(110), Pt(111), and a stepped Pt surface with Pt(111) terraces show a qualitative insensitivity of C2N2 chemistry to the structure of the underlying platinum surfaces. In all cases just cited, cyanogen is the only desorption product observed. High resolution electron energy loss spectroscopy has been combined with thermal desorption spectroscopy to study the intermediate which is formed by the reaction of C2N2 with H2 on Pt(111). The most likely structure for the intermediate is a di-imine (HN=CH-CH=NH). The di-imine is formed at 250K and decomposes to give back cyanogen and hydrogen at 430K.