Formation of molecular templates containing cumulative double bonds (C=C=C) at organic/silicon hybrid interfaces |
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Authors: | Huang Hai Gou Huang Jing Yan Zhang Yong Ping Ning Yue Sheng Yong Kian Soon Xu Guo Qin |
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Affiliation: | Department of Chemistry, National University of Singapore, 10 Kent Ridge, Singapore, 119260. |
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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. |
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