Lighting Up the Invisible Twisted Intramolecular Charge Transfer State by High Pressure
Lighting Up the Invisible Twisted Intramolecular Charge Transfer State by High Pressure
复制标题
高压点亮看不见的扭曲分子内电荷转移态
DOI：
10.1021/acs.jpclett.9b00026
复制
发表时间：
2019-02-21
影响因子：
5.7
通讯作者：
Ding, Dajun
中科院分区：
文献类型：
--
作者：
Li, Hui;Han, Jianhui;Ding, Dajun
扭曲分子内电荷转移态（TICT）在决定光电器件性能方面起着重要作用。然而，对于一些非荧光TICT分子，“不可见”的TICT状态只能通过修改分子结构来可视化。在这里，我们介绍了一种新的简单的压力诱导方法，通过使用周围溶剂的压力相关液-固相变来点亮TICT状态。结合超快光谱和量子化学计算，它揭示了“不可见”的TICT状态可以发射荧光时，供体基团的旋转受到限制的冷冻乙腈溶液。此外，TICT过程甚至可以通过外部压力进行有效调节。我们的研究提供了一个独特的策略，以实现双荧光行为的电荷转移分子，并在光电和生物医学应用的意义。
The twisted intramolecular charge transfer (TICT) state plays an important role in determining the performance of optoelectronic devices. However, for some nonfluorescent TICT molecules, the "invisible" TICT state could only be visualized by modifying the molecular structure. Here, we introduce a new facile pressure-induced approach to light up the TICT state through the use of a pressure-related liquid-solid phase transition of the surrounding solvent. Combining ultrafast spectroscopy and quantum chemical calculations, it reveals that the "invisible" TICT state can emit fluorescence when the rotation of a donor group is restricted by the frozen acetonitrile solution. Furthermore, the TICT process can even be effectively regulated by the external pressure. Our study offers a unique strategy to achieve dual fluorescence behavior in charge transfer molecules and is of significance for optoelectronic and biomedical applications.