Comparative study of phenol and thiophenol adsorption on Cu(110)
Comparative study of phenol and thiophenol adsorption on Cu(110)
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DOI：
10.1063/1.4815968
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发表时间：
2013-07-28
影响因子：
4.4
通讯作者：
Aruga, T.
中科院分区：
文献类型：
--
作者：
Kitaguchi, Y.;Habuka, S.;Aruga, T.
用扫描隧道显微镜和电子能量损失谱研究了苯酚和苯硫酚在铜(110)面上的吸附。苯酚在78K时完全吸附并形成环状三聚体，在300K时脱氢生成苯氧基(C6H5O)。另一方面，即使在78K下，苯酚也脱氢成硫代苯氧基(C6H5S)。两种产物都是通过硫原子键合到短桥位上，苯环几乎平行于表面。C6H5O和C6H5S基团分别沿[001]和[1(1)Over Bar2]方向优先组装到链中。链的生长是由偶极-偶极相互作用引起的，而链的方向则由硫族原子与相邻苯环之间的空间斥力决定。这项工作证明了苯酚物种的硫氧原子在其表面的覆盖生长中起着至关重要的作用。(C)2013 AIP出版有限责任公司。
Adsorption of phenol and thiophenol (benzenethiol) on Cu(110) is investigated by a scanning tunneling microscope and electron energy loss spectroscopy. Phenol adsorbs intact and forms a cyclic trimer at 78 K. It is dehydrogenated to yield a phenoxy (C6H5O) group at 300 K. On the other hand, thiophenol is dehydrogenated to a thiophenoxy (C6H5S) group even at 78 K. Both products are bonded via chalcogen atom to the short-bridge site with the phenyl ring oriented nearly parallel to the surface. The C6H5O and C6H5S groups are preferentially assembled into the chains along the [001] and [1 (1) over bar2] directions, respectively. Dipole-dipole interaction is responsible for the chain growth, while the chain direction is ruled by the steric repulsion between chalcogen atoms and adjacent phenyl ring. This work demonstrates a crucial role of chalcogen atom of phenol species in their overlayer growth on the surface. (C) 2013 AIP Publishing LLC.