Tseng HW, Shen JY, Kuo TY, Tu TS, Chen YA, Demchenko AP, Chou PT. Excited-state intramolecular proton-transfer reaction demonstrating anti-Kasha behavior.
Chem Sci 2015;
7:655-665. [PMID:
29896352 PMCID:
PMC5952995 DOI:
10.1039/c5sc01945a]
[Citation(s) in RCA: 92] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2015] [Accepted: 10/12/2015] [Indexed: 01/16/2023] Open
Abstract
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When excited with high energy quanta, specially designed 3-hydroxychromone derivatives demonstrate dramatic enhancement of the excited-state intramolecular proton transfer (ESIPT) reaction in obvious violation of Kasha's rule.
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.
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