利用电荷转移状态来最大限度地提高有机光反催化剂的交叉产量
Steven M Sartor1, Blaine G McCarthy2, Ryan M Pearson2
1Department of Chemistry and Biochemistry , University of Colorado , Boulder , Colorado 80309 , United States.
Journal of the American Chemical Society
|March 30, 2018
概括
研究人员开发了一种新的有机光反催化剂 (PC),可以有效地进入长寿命激发状态. 这一突破增强了系统间交叉 (ISC) 产量,这对于光电还原催化中的强效激发状态还原剂至关重要.
科学领域:
- 有机光电还原催化
- 摄影化学
- 催化剂的设计
背景情况:
- 过渡金属光电还原催化剂 (PCs) 经常通过改变自旋倍率的长寿命激发状态实现高量子产量.
- 有机PC面临着促进激发状态系统间交叉 (ISC) 的挑战,这限制了它们在产生强大的激发状态减速剂方面的实用性.
研究的目的:
- 设计具有最大化ISC产量的有机光氧催化剂.
- 在可见光吸收基PC中实现强烈的激发状态减光特性.
主要方法:
- 使用直角 π 系统和中间能量电荷转移激发状态.
- 合成和表征的基于素的有机PC.
- 研究激发状态系统间交叉 (ISC) 产量 (ΦISC) 和氧化还原潜力 (E0*).
主要成果:
- 达到了高降低 (E0* = - 1.7 V与SCE) 和可见光吸收的基PC.
- 通过替代N-来显著增加ISC产量 (ΦISC) 从0.11到0.91.
- 在结构修改后保持了具有催化作用的重要特性,例如氧化还原潜力.
结论:
- 通过战略性利用电子结构,设计的有机PC有效地最大限度地提高了ISC产量.
- 这种方法可以开发强大的有机激发状态减少剂,用于光电还原催化.
- 结构改造提供了一个可行的途径来提高催化剂的性能,而不会损害其基本性能.
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