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Published on: November 3, 2010
一个带有光门的STOP-GO分子航天器
Ali Coskun1, Douglas C Friedman, Hao Li
1Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, USA.
Journal of the American Chemical Society
|February 6, 2009
概括
研究人员使用光操作的门设计了分子航天器. 通过将甲基或基结合到阿佐比基单元中,他们控制了航天飞机.
科学领域:
- 超分子化学 超分子化学
- 分子机器 分子机器
- 摄影化学的使用.
背景情况:
- 退化 [2] 罗塔克桑具有动态平衡的特征,具有用于穿的低激活能量障碍.
- 减速器 (静态/静电屏障) 可以显著增加这些能源屏障.
- 4,4'-azobiphenyloxy (ABP) 单元在分子系统中提供了作为响应光的门的潜力.
研究的目的:
- 通过修改ABP单元来设计光控制的分子航天器.
- 为了研究固体 (甲基) 和电子 (原子) 修改对穿门功能的影响.
- 用光和热能证明精确控制分子航天器动力学.
主要方法:
- 合成的ABP衍生物具有四个甲基组 (ABP-Me) 和四个原子 (ABP-F).
- 利用紫外线和可见光调节门的状态.
- 研究了在不同的光照条件下对穿过程的自由激活能量 (DeltaG‡).
主要成果:
- ABP-Me(4) 导致一个永久关闭的门,表明有效的立体障碍.
- ABP-F(4) 显示了可切换光的行为:被紫外线照射而关闭,被可见光照射而打开.
- 光被证明可以反向控制自由能量屏障,使"STOP"和"GO"状态.
结论:
- 针对ABP单元的定制修改允许创建可光定位的分子门.
- 对固态和电子性质的光化学控制使分子穿运动的动态调节成为可能.
- 这项研究为开发具有可编程功能的先进分子机器提供了途径.
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