title: Formation of molecular templates containing cumulative double bonds (C=C=C) at organic/silicon hybrid interfaces.
abstract: The cumulative double bond (C=C=C), an important intermediate in synthetic organic chemistry, was successfully prepared via the selective attachment of acetylethyne to Si(111)-7 x 7. The experimental observation of the characteristic vibrational modes and electronic structures of the C=C=C group in the surface species demonstrates the [4 + 2]-like cycloaddition occurring between the terminal O and C atoms of acetylethyne and the neighboring Si adatom-rest atom pair, consistent with the prediction of density functional theory calculations. Scanning tunneling microscopy images further reveal that the molecules selectively bind to the adjacent adatom-rest atom pairs on Si(111)-7 x 7.
authors.affiliation: Department of Chemistry, National University of Singapore, 10 Kent Ridge, Singapore, 119260.
authors.forename: Hai Gou
authors.initials: HG
authors.lastname: Huang
authors.forename: Jing Yan
authors.initials: JY
authors.lastname: Huang
authors.forename: Yong Ping
authors.initials: YP
authors.lastname: Zhang
authors.forename: Yue Sheng
authors.initials: YS
authors.lastname: Ning
authors.forename: Kian Soon
authors.initials: KS
authors.lastname: Yong
authors.forename: Guo Qin
authors.initials: GQ
authors.lastname: Xu