Multiple configurations of N-methylpyrrole binding on Si(111)-7X7

Feng Tao, Ze Liang Yuan, Xian Feng Chen, Ming Hua Qiao, Zhong Hai Wang, Yu Jing Dai, Hai Gou Huang, Yong Cao, Guo Qin Xu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The adsorption configurations of N-methylpyrrole on Si(111)-7x7 were investigated using high-resolution electron energy-loss spectroscopy, x-ray photoelectron spectroscopy (XPS), scanning tunneling microscopy (STM), and density function theory calculations. Compared to physisorbed N-methylpyrrole, chemisorbed molecules present a different vibrational feature at 2886 cm-1 attributable to v[(Si)Csp3-H] in addition to the vibrational features of (sp2)Cα-H (3106 cm-1), (sp2)Cβ-H (3050 cm-1), and C-H of CH3 (2944 cm-1) stretching modes, demonstrating the direct interaction between C=C bonds and Si(111)-7x7. The major change of N 1s XPS spectrum of N-methylpyrrole upon chemisorption strongly suggests the coexistence of two chemisorption states, further confirmed in the strong dependence of STM image features on the sample bias together with statistical analysis. The concurrent occurrence of [4+2] and [2+2] cycloadditions is proposed to account for these two adsorption configurations of N-methylpyrrole on Si(111)-7x7.

Original languageEnglish
Article number245406
Pages (from-to)2454061-2454068
Number of pages8
JournalPhysical Review B (Condensed Matter)
Issue number24
Publication statusPublished - 1 Jun 2003


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