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Effects of π-conjugation-substitution on ESIPT process for oxazoline-substituted hydroxyfluorenes |
| Di Wang(汪迪)1, Qiao Zhou(周悄)1,2,†, Qiang Wei(魏强)3, and Peng Song(宋朋)1,‡ |
1 Department of Physics, Liaoning University, Shenyang 110036, China;
2 College of Mathematics and Information Engineering, Chongqing University of Education, Chongqing 400065, China;
3 School of Science, Chongqing University of Technology, Chongqing 400050, China |
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Abstract Excited-state intramolecular proton transfer (ESIPT) molecules are broadly applied to UV absorbers, fluorescence sensing, and lighting materials. In previous work, the fluorescence colors of oxazoline-substituted hydroxyfluorenes and hydroxylated benzoxazole were diversified by adding the π-conjugation. There is intriguing that the mechanism of diversified fluorescence colors induced by ESIPT. Here, the density functional theory (DFT) and time-dependent DFT (TDDFT) are advised to identify the effects of π-conjugation on ESIPT and photophysical properties. The stabilized geometrical configurations, frontier molecular orbitals (FMOs) isosurfaces, and O-H stretching vibration frequency analysis demonstrate that PT processes are more active in S1 state. Constructing the minimum energy pathways of ESIPT processes, we find that the calculated peak of enol and keto fluorescence of naphthoxazole (NO-OH) is distinctly bathochromic-shift relative to the oxazoline-substituted hydroxyfluorenes (Oxa-OH) configuration when adding π-conjugation-substitution, and it means that π-conjugation-substitution can diversify the fluorescence color. We hope our studies can establish new channels to devise the ESIPT-based molecules.
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Received: 06 February 2022
Revised: 08 April 2022
Accepted manuscript online: 11 April 2022
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PACS:
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82.39.Jn
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(Charge (electron, proton) transfer in biological systems)
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31.15.ee
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(Time-dependent density functional theory)
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87.15.ht
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(Ultrafast dynamics; charge transfer)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11974152), the Shenyang High level Innovative Talents Program (Grant No. RC200565), the Science program of Liaoning Provincial Department of Education (Grant No. LJKZ0097), the Intercollegiate cooperation project of colleges and universities of Liaoning Provincial Department of Education. |
Corresponding Authors:
Qiao Zhou, Peng Song
E-mail: zhouq@cque.edu.cn;songpeng@lnu.edu.cn
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Cite this article:
Di Wang(汪迪), Qiao Zhou(周悄), Qiang Wei(魏强), and Peng Song(宋朋) Effects of π-conjugation-substitution on ESIPT process for oxazoline-substituted hydroxyfluorenes 2023 Chin. Phys. B 32 028201
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