期刊
ACS NANO
卷 11, 期 9, 页码 9397-9404出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b04900
关键词
steering surface reaction; self-assembly strategy; active site; Ullmann coupling; scanning tunneling microscopy
类别
资金
- NSFC [91527303, 21333001]
- MOST, China [2017YFA0204702]
- Danish Council for Independent Research Natural Sciences
- Danish National Research Foundation
- Alexander von Humboldt Foundation
To discern the catalytic activity of different active sites, a self-assembly strategy is applied to confine the involved species that are attached to specific surface sites. The employed probe reaction system is the Ullmann coupling of 4-bromobiphenyl, C6H5C6H4Br, on an atomically flat Ag(111) surface, which is explored by combined scanning tunneling microscopy, synchrotron X-ray photoelectron spectroscopy, and density functional theory calculations. The catalytic cycle involves the detachment of the Br atom from the initial reactant to form an organometallic intermediate, C6H5C6H4AgC6H4C6H5, which subsequently self-assembles with its central Ag atom residing either on 2-fold bridge or 3-fold hollow sites at full coverage. The hollow site turns out to be catalytically more active than the bridge one, allowing us to achieve site-steered reaction control from the intermediate to the final coupling product, p-quaterphenyl, at 390 and 410 K, respectively.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据