title: Comparative study of phenol and thiophenol adsorption on Cu(110).
abstract: 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 [112] 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.
authors.affiliation: Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Kitaguchi
authors.forename: S
authors.initials: S
authors.lastname: Habuka
authors.forename: T
authors.initials: T
authors.lastname: Mitsui
authors.forename: H
authors.initials: H
authors.lastname: Okuyama
authors.forename: S
authors.initials: S
authors.lastname: Hatta
authors.forename: T
authors.initials: T
authors.lastname: Aruga