title: Formation of a tetra-sigma-bonded intermediate in acetylethyne binding on Si(100)-2 x 1.
abstract: The covalent binding of acetylethyne on Si(100)-2 x 1 has been investigated using high-resolution electron energy loss spectroscopy (HREELS) and X-ray photoelectron spectroscopy (XPS). The HREELS spectra of chemisorbed monolayers show the absence of the C=O, C[triple bond]C, and C(sp)-H stretching modes coupled with the appearance of C=C (at 1580 cm(-1)) and C(sp2)-H (at 3067 cm(-1)) stretching modes. This demonstrates that both of the C=O and CC groups of acetylethyne directly participate in binding with silicon surfaces to form C-O and C=C bonds, respectively, which is further confirmed by the XPS studies. A tetra-sigma-binding configuration through two [2 + 2]-like cycloaddition reactions in acetylethyne binding on Si(100) is proposed to account for the experimental observation. The cycloadduct containing a C=C double bond may be employed as an intermediate for further in situ chemical syntheses of multilayer organic thin films or surface functionalization.
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: Ying Hui
authors.initials: YH
authors.lastname: Cai
authors.forename: Jing Yan
authors.initials: JY
authors.lastname: Huang
authors.forename: Hai Hua
authors.initials: HH
authors.lastname: Tang
authors.forename: Guo Qin
authors.initials: GQ
authors.lastname: Xu