960化工网
Excited-state intramolecular proton-transfer reaction demonstrating anti-Kasha behavior†
Huan-Wei Tseng,Jiun-Yi Shen,Ting-Yi Kuo,Ting-Syun Tu,Yi-An Chen,Alexander P. Demchenko,Pi-Tai Chou
Chemical Science Pub Date : 10/12/2015 00:00:00 , DOI:10.1039/C5SC01945A
Abstract

We report unusual photophysical properties observed on two newly designed 3-hydroxychromone derivatives exhibiting the excited-state intramolecular proton transfer (ESIPT) reaction. The efficiency of ESIPT reaction is greatly enhanced upon excitation with high energy quanta to Sn (n > 1) levels in low-polarity solvents. Based on detailed analyses of excitation and emission spectra as well as time-resolved emission kinetics we derive that conditions, in which this phenomenon contradicting Kasha's rule is observed, are quite different from that for observation of anti-Kasha emission.

Graphical abstract: Excited-state intramolecular proton-transfer reaction demonstrating anti-Kasha behavior
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