Formation of highly ordered organic monolayers by dative bonding: Pyridine on Ge(100)

被引:59
作者
Cho, YE
Maeng, JY
Kim, S
Hong, SY
机构
[1] Korea Adv Inst Sci & Technol, Dept Chem, Taejon 305701, South Korea
[2] Korea Adv Inst Sci & Technol, Sch Mol Sci, Taejon 305701, South Korea
[3] Sejong Univ, Dept Phys, Seoul 143747, South Korea
关键词
D O I
10.1021/ja0344617
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The adsorption of pyridine onto the Ge(100) surface has been studied using both real-time scanning tunneling microscopy (STM) and ab initio pseudopotential density functional calculations. The results show that pyridine molecules adsorb on the electron-deficient down-Ge atoms of the Ge=Ge dimers via Ge-N dative bonding, with the pyridine ring tilted to the surface. The electron-rich up-Ge atoms remaining after adsorption of pyridine induce an asymmetric dimer row, which is mainly reconstructed to the c(4×2) structure. At pyridine coverage of 0.25 ML, the adsorbed pyridine molecules form a perfectly ordered monolayer. The entire Ge substrate underlying this organic monolayer rearranges into the c(4×2) structure. Copyright © 2003 American Chemical Society.
引用
收藏
页码:7514 / 7515
页数:2
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