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Updated: Feb 9, 2026

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Published on: July 19, 2019
Excited-state intramolecular proton-transfer reaction demonstrating anti-Kasha behavior
Huan-Wei Tseng1, Jiun-Yi Shen1, Ting-Yi Kuo1
1Department of Chemistry , National Taiwan University , Taipei , 10617 Taiwan , Republic of China . Email: chop@ntu.edu.tw ;
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 S (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.
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