Hydrogen-Bonded Thiol Undergoes Unconventional Excited-State Intramolecular Proton-Transfer Reactions
作者:Jian-Kai Wang、Chih-Hsing Wang、Chi-Chi Wu、Kai-Hsin Chang、Chun-Hsiang Wang、Yi-Hung Liu、Chao-Tsen Chen、Pi-Tai Chou
DOI:10.1021/jacs.3c10405
日期:2024.2.7
The chapter on the thiol-related hydrogen bond (H-bond) and its excited-state intramolecular proton-transfer (ESIPT) reaction was recently opened where compound 4′-diethylamino-3-mercaptoflavone (3NTF) undergoes ESIPT in both cyclohexane solution and solid, giving a 710 nm tautomer emission with an anomalously large Stokes shift of 12,230 cm–1. Considering the thiol H-bond to be unconventional compared
最近开设了有关硫醇相关氢键(H-bond)及其激发态分子内质子转移(ESIPT)反应的章节,其中化合物4'-二乙氨基-3-巯基黄酮( 3NTF )在环己烷溶液和固体,产生 710 nm 互变异构体发射,斯托克斯位移异常大,为 12,230 cm –1 。考虑到硫醇氢键与传统的鲍林型-OH或-NH氢键相比是非常规的,因此有必要及时探讨其与ESIPT之间的根本区别。然而,由于互变异构最低激发态的主导n π* 特征,硫醇相关的 ESIPT 往往是非发射性的。在此,基于3-巯基黄酮支架和π-延伸概念,设计并合成了一系列具有不同氢键强度和690-720 nm互变异构体的新系列4′-取代-7-二乙氨基-3-巯基黄酮NTF 。在环己烷中紫外 (UV) 激发时的发射。实验确定它们的氢键强度顺序为N-NTF < O-NTF < H-NTF < F-NTF ,而通过荧光上转换测量的 -SH ESIPT 速率为F-NTF