Microscopic identification of a bimolecular reaction intermediate

被引：15

作者：

Uetsuka, H ^{[1
]}

Sasahara, A ^{[1
]}

Yamakata, A ^{[1
]}

Onishi, H ^{[1
]}

机构：

[1] Kanagawa Acad Sci & Technol, Takatsu Ku, Kawasaki, Kanagawa 2130012, Japan

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2002年 / 106卷 / 44期

关键词：

D O I：

10.1021/jp026253r

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：

How a molecule impinging from an ambient phase attaches to and reacts with a preadsorbed reactant was studied by scanning tunneling microscopy (STM). A carboxylate (RCOO-) chemisorbed on a TiO2(110) surface was exchanged by another carboxylate (R'COO-) via an S(N)2-like mechanism when the RCOO--covered TiO2 surface was exposed to R'COOH vapor at room temperature or below. An R'COOH impinging from the gas phase was temporarily bound to a preadsorbed RCOO- yielding a bimolecular intermediate. The trapped R'COOH was inserted into the monolayer and dissociated to produce an adsorbed R'COO-. One of the carboxylates (RCOO- or R'COO-) was then pushed out of the monolayer to restore the intermediate and released to the vapor phase. The individual reaction steps were resolved using time-lapse imaging.

引用

页码：11549 / 11552

页数：4

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