Adsorption of phenyl isothiocyanate on Si(001): A 1,2-dipolar surface addition reaction

被引:68
作者
Ellison, MD [1 ]
Hamers, RJ [1 ]
机构
[1] Univ Wisconsin, Dept Chem, Madison, WI 53706 USA
来源
JOURNAL OF PHYSICAL CHEMISTRY B | 1999年 / 103卷 / 30期
关键词
D O I
10.1021/jp990010q
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The adsorption of phenyl isothiocyanate (PITC) on silicon (001) surfaces has been investigated using X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) spectroscopy, scanning tunneling microscopy (STM), and ab initio calculations. The experimental evidence shows that adsorption onto the Si surface occurs in a highly selective manner, through the N=C=S group and not through the benzene ring. Both experimental and theoretical evidence suggests that the adsorption involves the interaction of the N and C atoms of the N=C=S group with the Si=Si dimer, forming a four-member Si2NC ring at the interface. This process leaves the aromatic ring nearly unperturbed and is analogous to a 1,2-dipolar addition reaction. Theoretical calculations confirm that this is the most stable product.
引用
收藏
页码:6243 / 6251
页数:9
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