Excited-State Intramolecular Proton Transfer (ESIPT) Fine Tuned by Quinoline−Pyrazole Isomerism: π-Conjugation Effect on ESIPT
作者:Min-Wen Chung、Tsung-Yi Lin、Cheng-Chih Hsieh、Kuo-Chun Tang、Hungshin Fu、Pi-Tai Chou、Shen-Han Yang、Yun Chi
DOI:10.1021/jp1036102
日期:2010.8.5
five-membered intramolecular hydrogen bonding. Despite the similarity in molecular structure, however, only I undergoes excited-state intramolecular proton transfer, as evidenced by the distinct 560 nm proton-transfer emission and its associated relaxation dynamics. The experimental results support a recent theoretical approach regarding the conjugation effect on a proton (or hydrogen atom) transfer reaction
有策略地设计和合成了一系列的喹啉/异喹啉-吡唑异构体(I - III),其中的吡唑部分位于不同的取代位置,显示出具有五元分子内氢键的系统。尽管分子结构相似,但是只有I经历了激发态的分子内质子转移,这由独特的560 nm质子转移发射及其相关的弛豫动力学证明。实验结果支持关于上的质子(或氢原子)转移反应的共轭效应的最近的理论方法(J.物理学。化学式甲2009,113,4862−4867)。该概念只是简单地预测,质子转移互变异构体物种的π共轭扩展(即共振)可能会允许反应中心中多余电荷的有效离域,从而导致更大的质子转移热力学驱动力。