电子传输速率最大在大的捐赠者-接受器距离
Martin Kuss-Petermann1, Oliver S Wenger1
1Department of Chemistry, University of Basel , St. Johanns-Ring 19, 4056 Basel, Switzerland.
Journal of the American Chemical Society
|January 23, 2016
概括
在刚性分子三合体中,电子传输速率在较长距离 (30.6 Å) 上达到惊人的峰值,挑战了关于电子传输动态和距离依赖性的先前假设.
科学领域:
- 物理化学
- 分子生物物理学
- 材料科学
背景情况:
- 电子转移是许多化学和生物过程的基础.
- 通常,随着电子捐赠者和接受者之间的距离增加,反应速率会降低.
- 对于设计高效的能量转换系统来说,了解依赖于距离的电子传输至关重要.
研究的目的:
- 在扩展的捐赠者接受器距离上调查电子传输速率.
- 在刚性系统中探索分子结构和电子转移效率之间的关系.
- 将实验结果与现有的电子转移理论相协调.
主要方法:
- 三个具有p-xylen桥梁的刚性杆状供体-光敏剂-受体三元组的同类序列的合成.
- 实验测量热电子转移速率.
- 对捐赠者与接受者的合和重组能量的分析.
主要成果:
- 在30.6 Å的捐赠者-接受者分离时观察到的最大电子转移速率.
- 证明了电子合的弱距离依赖.
- 随着距离的增加,外层重组能量的强烈增加.
结论:
- 实验结果与电子转移动态的理论预测一致.
- 这些发现突显了合和重组能量的复杂相互作用.
- 观察到的现象对优化光化能源转化技术具有重要意义.
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