A Single 2‐(2′‐Hydroxyphenyl)benzothiazole Derivative Can Achieve Pure White‐Light Emission |
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| Authors: | Jinling Cheng Dr Di Liu Lijun Bao Kai Xu Dr Yang Yang Prof Keli Han |
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| Institution: | 1. State Key Laboratory of Fine Chemicals, School of Chemistry, Dalian University of Technology, 2 Linggong Road, Dalian 116024 (P.R. China);2. State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, CAS, Dalian 116023 (P.R. China) |
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| Abstract: | The synthesis and photophysics of two novel 2‐(2′‐hydroxyphenyl)benzothiazole (HBT) derivatives are presented. The electron‐withdrawing trifluoromethyl (CF3) group in compound 1 facilitates the deprotonation of the phenolic hydroxy group. Well‐resolved triple fluorescence from the enol, keto, and phenolic anion, which ranges from 350 to 600 nm, was detected for 1 in ethanol, which marks the first time triple fluorescence from an excited‐state intramolecular proton transfer (ESIPT) molecule has been reported. Both triphenylamine and CF3 were introduced into derivative 2 . Intramolecular charge transfer and the “red‐edge effect” resulted in the bathochromic shift of dual fluorescence of 2 . Triple fluorescence was also observed for 2 in ethanol. In mixed acetonitrile and ethanol, pure white‐light emission with CIE coordinates of (0.33, 0.33) and a quantum yield of 0.25 was achieved for 2 . This work provides a new avenue for the rational design of an ESIPT molecule to achieve white‐light generation under mild conditions. |
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| Keywords: | charge transfer enols fluorescence hydrogen bonds photophysics |
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