Abstract
The adsorption and thermal reactions of 2,3-dibromopyridine on Cu(100) in ultra-high vacuum system have been studied using the surface techniques of temperature-programmed reaction/desorption (TPR/D), x-ray photoelectron spectrocopy (XPS) and near edge x-ray absorption fine structure (NEXAFS). The TPR/D study shows that the molecular desorption from the multilayer amd monolayer occurs at 270 K and 220 K. The XPS evidence reveals the stepwise C-Brdisoociation of C5NBr2H3→C5NBrH3→C5NH3. The C-Br bond of C5NBr2H3 can be broken at 110 K, but is completed prior to 400 K. The C5NH3 is stable upto 480 K and then dissociates by C-H scission. Thermal decomposition of C5NH3 causes the desorption of H2 (650 K), HCN (676 K, 872 K), HBr (686 K) and C2N2 (842 K). NEXAFS suggests that the angle between the aromatic plane of C5NBr2H3,C5NBrH3 or C5NH3 and the copper surface is at 45-55o.
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