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

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

Research output: Contribution to journalArticlepeer-review

Abstract

The adsorption configurations of N-methylpyrrole on Si(111) − 7 × 7 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 ν[(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) − 7 × 7. 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) − 7 × 7.

Original languageEnglish
JournalPhysical review B
Volume67
Issue number24
DOIs
Publication statusPublished - 6 Jun 2003

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