Conductance switching in single molecules through conformational changes
Conductance switching in single molecules through conformational changes
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DOI：
10.1126/science.1060294
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发表时间：
2001-06-22
期刊：
影响因子：
56.9
通讯作者：
Weiss, PS
中科院分区：
文献类型：
--
作者：
Donhauser, ZJ;Mantooth, BA;Weiss, PS
随着时间的推移，我们跟踪的电导开关的单一和捆绑的亚苯基乙炔基低聚物隔离在矩阵的烷硫醇单分子膜。处于ON或OFF开关状态的孤立和成束分子的持续时间从几秒到几十小时不等。当周围的基质有序时，插入的分子转换的速率很低。相反，当周围的基质秩序不好时，插入的分子会更频繁地切换。我们的结论是开关是分子或束的构象变化的结果，而不是电荷转移的静电效应。
We tracked over time the conductance switching of single and bundled phenylene ethynylene oligomers isolated in matrices of alkanethiolate monolayers. The persistence times for isolated and bundled molecules in either the ON or OFF switch state range from seconds to tens of hours. When the surrounding matrix is well ordered, the rate at which the inserted molecules switch is low. Conversely, when the surrounding matrix is poorly ordered, the inserted molecules switch more often. We conclude that the switching is a result of conformational changes in the molecules or bundles, rather than electrostatic effects of charge transfer.