Lighting Up the Invisible Twisted Intramolecular Charge Transfer State by High Pressure,The Journal of Physical Chemistry Letters

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Lighting Up the Invisible Twisted Intramolecular Charge Transfer State by High Pressure
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2019-01-31 00:00:00 , DOI: 10.1021/acs.jpclett.9b00026
Hui Li ₁ , Jianhui Han ₁ , Huifang Zhao ₁ , Xiaochun Liu ₁ , Yi Luo ₂ , Ying Shi ₁ , Cailong Liu ₁ , Mingxing Jin ₁ , Dajun Ding ₁

Affiliation

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.

中文翻译：

高压点亮不可见的扭曲分子内电荷转移态

扭曲的分子内电荷转移（TICT）状态在确定光电器件的性能中起着重要作用。但是，对于某些非荧光的TICT分子，只能通过修改分子结构来可视化“不可见”的TICT状态。在这里，我们介绍了一种新的简便的压力诱导方法，该方法通过使用周围溶剂与压力相关的液相-固相转变来点亮TICT状态。结合超快光谱学和量子化学计算，发现当供体基团的旋转受到冷冻乙腈溶液的限制时，“不可见”的TICT状态会发出荧光。此外，通过外部压力甚至可以有效地调节TICT进程。

更新日期：2019-01-31

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