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在水溶液中的监禁供体和自由受体之间进行超快的光诱导电子转移
Mintu Porel1, Chi-Hung Chuang, Clemens Burda
1Department of Chemistry, University of Miami, Coral Gables, Florida 33124, USA.
Journal of the American Chemical Society
|August 31, 2012
概括
库马林153和维奥基因之间的光诱导电子转移在八度酸宿主中迅速发生. 封装加快了动态,防止了溶剂放松,显示了强大的电子合.
科学领域:
- 超分子化学 超分子化学
- 摄影化学的使用.
- 电子转移动态的电子转移动态
背景情况:
- 光诱导电子转移 (PET) 在化学和生物系统中至关重要.
- 了解PET跨越分子障碍是设计人工光合作用系统的关键.
- 主客复杂化可以调节电子转移动力学.
研究的目的:
- 为了研究氨酸153 (C153) 和4,4'-二甲基二化物 (MV(2+)) 之间的超分子光诱导电子转移动力学,在八酸 (OA) 主体内.
- 阐明封装对电子转移动力学和放松动态的影响.
- 探索主机-客户互动在调节电子转移通路中的作用.
主要方法:
- 用5秒时间分辨率的光谱学,使用150 fs的激光脉冲在390 nm.
- 在OA宿主囊中对C153和MV(2+) 的研究.
- 用自由解决方案动态进行比较分析.
主要成果:
- 超快的电子转移从光激发的C153到MV(2+) 穿过OA分子屏障.
- 电子转移发生在20ps内,尽管C153被封装.
- 电荷转移状态的寿命很短 (724 ps),反向转移快 (<1 ns),表明电子合强.
- 与自由溶液相比,封装加速了动态,抑制了溶剂放松.
结论:
- 由OA进行的超分子封装显著改变了光诱导的电子转移动态.
- 宿主-客人相互作用促进超快速的电子传输穿越分子屏障.
- 这项研究证明了宿主分子控制和增强电子转移过程的潜力.
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