Abstract
Two novel organic fluorescent isomers with D-π-π-A prototype structure, namely, (E)-2-[3-([1,1'-biphenyl]-4-yl)-1-(6-methoxynaphthalen-2-yl)allylidene]malononitrile and (E)-2-[1-([1,1'-biphenyl]-4-yl)-3-(6-methoxynaphthalen-2-yl)allylidene]malononitrile, were synthesized. Due to the exchange of naphthalene and biphenyl moieties on each side of conjugated bridge (C = C(CN)2)-conjugated bridge (C = C) group, two compounds are organic fluorescent isomers, and display different molecular stacking mode and photophysical property. Molecules of (E)-2-[3-([1,1'-biphenyl]-4-yl)-1-(6-methoxynaphthalen-2-yl)allylidene]malononitrile are packed with H-aggregation, while (E)-2-[1-([1,1'-biphenyl]-4-yl)-3-(6-methoxynaphthalen-2-yl)allylidene]malononitrile has a J-aggregation. Both of two compounds show solvatochromism and tunable aggregation-induced enhanced emission property.
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Acknowledgements
This work has been supported by the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (Project 19KJB150021), Research Fund Project of Changzhou Vocational Institute of Engineering (Project 11130300118010), Qinglan Project of Jiangsu Province; National Vocational Education Teacher Teaching innovation Team Consruction Project (Project 360A10-04-2019-0017-1/1-72) and Research Foundation for Advanced Talents of Changzhou Vocational Institute of Engineering (Project 11130900118004).
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Wu, DE., Guo, QH., Qiao, Q. et al. The isomeric effect on the D-π-π-A prototype fluorescent material: synthesis, photophysical property, and computation. Monatsh Chem 152, 1315–1326 (2021). https://doi.org/10.1007/s00706-021-02846-z
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DOI: https://doi.org/10.1007/s00706-021-02846-z