A nitrogroup is a common fluorescence quencher, but its quenching efficiency can be easily affected by the surrounding environment. To date, there has been no systematic study on the effects of electron-withdrawing groups on the quenching efficiency of nitrogroups. Herein, by virtue of experimental validation and theoretical calculations, we found that strong electron-withdrawing groups, such as
in both lysosomal and mitochondrial organelles with low dark toxicity, high cytotoxicity under white-light and remarkable PDT efficiency. Our study has thus elucidated a rationally designed strategy at the molecular level to fine-tune ICT and SOC features for the advance of AIE-active type-I ROS PSs, opening a new avenue for cancer treatment and image-guided therapy.
开发具有聚集诱导发射 (AIE) 特性的 I 型活性氧 (ROS) 的光敏剂 (PS) 是克服传统光动力疗法 (PDT) 缺陷的明智方法。然而,使用简单的治疗诊断支架设计具有 AIE 活性的 I 型 ROS PS 仍然是一个挑战,该支架与分子内电荷转移 (ICT) 和大自旋轨道耦合 (SOC) 特征之间的微妙平衡相结合,以促进系统间交叉 (ISC)从而增强三重态激子以产生 I 型 ROS,并改善所需生物医学应用的光学特性。在这项工作中,基于 C-6 取代的四苯基乙烯-稠合苯并噻唑-香豆素支架设计合理的系列 PSs,命名为TPE - n CUMs,通过稠环电子受体 (FREA) 策略合成, 在水溶液中具有 AIE 特性, 从而在白光照射下自我监测 I 型 ROS 生成, 以研究不同 ICT 和 SOC 电位对它们的光化学和光学性质。实验和理论结果都表明,ICT 和 SOC 特征的同时增加强度促进了