Molecular wire formation from viologen assemblies

被引：55

作者：

Haiss, W ^{[1
]}

van Zalinge, H ^{[1
]}

Höbenreich, H ^{[1
]}

Bethell, D ^{[1
]}

Schiffrin, DJ ^{[1
]}

Higgins, SJ ^{[1
]}

Nichols, RJ ^{[1
]}

机构：

[1] Univ Liverpool, Dept Chem, Ctr Nanoscale Sci, Liverpool L69 7ZD, Merseyside, England

来源：

LANGMUIR | 2004年 / 20卷 / 18期

关键词：

D O I：

10.1021/la049183j

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The adsorption behavior of viologen alpha,omega-dithiols (viologen dithiols) on gold has been investigated. At short exposures, a low-coverage phase consisting of flat-lying molecules has been determined by STM and IR spectroscopy. In contrast, multilayer films are formed after long adsorption times. Single molecular wires could be formed between a gold STM tip and a surface with a low coverage of the adsorbed dithiols, and their electrical behavior was investigated. Molecular conductivity was determined either by the repeated measurement of I(s) curves or by recording I-V curves for different tip-sample separations. These methods concurred in producing a value of (0.5 +/- 0.1) nS for the single-molecule conductivity of the alpha,omega-viologen dithiol molecule HS-6V6-SH. The high conductivity of HS-6V6-SH, as compared to that of HS-C12-SH, may be related to the low-lying LUMO, which provides a barrier indentation for electron transport in a two-step electron-transfer mechanism.

引用

页码：7694 / 7702

页数：9

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