在STM断路口内检测机械化学化
Edmund Leary1,2, Cécile Roche3, Hua-Wei Jiang3
1Department of Chemistry, Donnan and Robert Robinson Laboratories, University of Liverpool , Liverpool L69 7ZD, U.K.
Journal of the American Chemical Society
|December 21, 2017
概括
我们研究了与硫结合组的二甲单分子导电性. 与甲基硫化不同的是,酸乙的cis异构体在结位内异构化.
科学领域:
- 分子电子
- 超分子化学
- 有机化学
背景情况:
- 研究单分子导电性对于分子电子学至关重要.
- 具有特定结合组的二甲具有可调节的电子性质.
- 分子中的化可以影响它们的自我组装和电子行为.
研究的目的:
- 测量和比较diaryl porphyrins与乙烯 (SAc) 和甲基硫化物 (SMe) 结合群的单分子导电性.
- 在导电性测量中了解体 (cis 和 trans 异构体) 的作用.
- 为了阐明电荷传输路径和结合机制.
主要方法:
- 扫描道显微镜断裂结 (STM-BJ) 技术.
- 用SAc或SMe组进行体置换的5,15-利的合成.
- 导电平面图和连接长度分布的分析
主要成果:
- 所有S2化合物表现出两个导电性组,归因于直接的Au-porphyrin和S-S通路.
- 甲基硫化物 (SMe) 异构体表现出不同的结长,反映出它们的S-S距离.
- 乙 (SAc) 异构体没有长度差异,表明结点内的cis-to-trans异构化.
结论:
- 异构化的障碍低于Au-S/Au-Au键,但高于Au-SMe键.
- 结合中的压力会诱导cis-SAc氨酸的异体化,而不是SMe氨酸的异体化.
- 单分子导电性测量可以探测形态动力学和异构化障碍.
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