1-Bromo-4-ethynylbenzene on Cu(100): Adsorption, bonding structures, and reaction mechanisms

Yu Hsien Chiang, Ying Fan Liu, Zheng Jie You, Ying Xuan Liu, Kuan Wen Tseng, Ming Wei Lin, Jong Liang Lin, Chia Hsin Wang, Yaw Wen Yang

研究成果: Article同行評審

摘要

Temperature-programmed reaction/desorption, X-ray photoelectron spectroscopy, reflection-absorption infrared spectroscopy, near edge X-ray absorption fine structure and density functional theory calculations have been employed to investigate the adsorption, bonding structures, and reaction pathways of 1-bromo-4-ethynylbenzene (BrC6H4C ≡ CH, 1Br4EB) on Cu(100). This molecule is chemically adsorbed, via the ethynyl group attaching to the surface, forming two C-Cu bonds and a ~ 60° tilting aromatic plane with respect to the surface. At 370 K, dissociation of both the C-Br and CC-H bonds of 1-bromo-4-ethynylbenzene generates adsorbed intermediates of C6H5C2, C6H4C2H2, and C6H4C2. The C-Br breakage temperature is much higher than those (~ 240 K) observed in the cases of bromobenzene/Pt(111) and dibromopyridine/Cu(100), owing to the adsorption geometry of 1-bromo-4-ethylnylbenzene, with the C-Br pointing away from the surface. In the case of higher coverages, molecular desorption occurs near 370 K. The adsorption structures of the aromatic intermediates of C6H4CHCH, C6H4CCH2, C6H4CH2C, C6H4C2, and C6H5C2 are calculated and compared. They are stable up to ~520 K and decompose to form H2 at higher temperatures (~520–870 K). No hydrocarbon products, such as C2H2, C2H4, C6H6, C6H5CCH, or C6H5CHCH2, are measured.

原文English
期刊Journal of the Chinese Chemical Society
DOIs
出版狀態Published - 2022 9月

All Science Journal Classification (ASJC) codes

  • 一般化學

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