A General Twisted Intramolecular Charge Transfer Triggering Strategy by Protonation for Zero-Background Fluorescent Turn-On Sensing,The Journal of Physical Chemistry Letters

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A General Twisted Intramolecular Charge Transfer Triggering Strategy by Protonation for Zero-Background Fluorescent Turn-On Sensing
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2022-11-17 , DOI: 10.1021/acs.jpclett.2c02847
Jiguang Li _{1,

2} , Da Lei ₁ , Zhiwei Ma _{1,

2} , Baiyi Zu ₁ , Xincun Dou _{1,

2}

Affiliation

The exploration of organic fluorescent sensing materials and mechanisms is of great significance, especially for the deep understanding of twisted intramolecular charge transfer (TICT). Here, the electron-donating ability of a chemically protonated amino group and the corresponding excitation primarily ensure the occurrence of excited-state intramolecular proton transfer. Due to the hybridization of the amino group from sp³ to sp², the steric hindrance effect and conjugative effect together boost the rotation efficiency of the TICT process and the complete elimination of the background fluorescent signal. Furthermore, a sharp turn-on fluorescent detection of trace nitrite particulate with a diameter of 0.44 μm was realized. In addition, this protonation-induced change in the amino group configuration was verified through around nine categories of compounds. We expect this modulation of the photochemical activity path of the TICT process would greatly facilitate the exploration of novel fluorescent sensing mechanisms.

中文翻译：

用于零背景荧光开启传感的质子化通用扭曲分子内电荷转移触发策略

有机荧光传感材料和机理的探索具有重要意义，尤其是对于扭曲分子内电荷转移（TICT）的深入理解。这里，化学质子化的氨基的给电子能力和相应的激发主要确保激发态分子内质子转移的发生。由于氨基从 sp ³到 sp ^2的杂交，空间位阻效应和共轭效应共同提高了 TICT 过程的旋转效率和背景荧光信号的完全消除。此外，实现了对直径为 0.44 μm 的痕量亚硝酸盐颗粒的快速开启荧光检测。此外，这种由质子化引起的氨基构型变化已通过大约九类化合物得到验证。我们预计 TICT 过程的光化学活性路径的这种调制将极大地促进新型荧光传感机制的探索。

更新日期：2022-11-17

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