In situ time-resolved XAFS study of the reaction mechanism of bromobenzene homocoupling mediated by [Ni(cod)(bpy) |
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Authors: | Asakura Hiroyuki Shishido Tetsuya Tanaka Tsunehiro |
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Institution: | Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan. |
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Abstract: | A homocoupling reaction mechanism of bromobenzene mediated by the Ni(cod)(bpy)] (cod = 1,5-cyclooctadiene; bpy = 2,2'-bipyridine) complex was investigated by means of in situ time-resolved X-ray absorption fine structure (XAFS) and factor analysis. A dimer intermediate Ni(bpy)(Ph)Br](2) proposed in the previous studies by other groups is too dilute to observe with the XAFS technique; however, the structures and concentrations on the time course of a reactant Ni(cod)(bpy)], an intermediate Ni(bpy)(Ph)Br(dmf)(2)], and a byproduct Ni(bpy)Br(2)(dmf)] during reaction are revealed by this combination. |
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