Abstract
Cu(II)-selective fluorescence enhancement (1, 2, and 4) or fluorescence quenching (3) was observed for aminostilbenes 1–4 in acetonitrile. The fluorescence responses result from efficient Cu(II)-mediated oxidation of 1–4 that forms new fluorescent species rather than from any specific noncovalent interactions. Evidence of redox reactions includes irreversible Cu(II) titration spectra, spectroscopic observation of the radical cations, and isolation of oxidized aminostilbene dimers. These results provide a new method for synthesis of tetrasubstituted tetrahydrofurans and suggest that aminostilbenes with twisted intramolecular charge-transfer activity are potential fluorescence-enhanced Cu(II) chemodosimeters. The role of Cu(II)-mediated redox reactions should be always taken into account in mechanisms for sensing of arylamine-based Cu(II)-selective fluoroionophores.
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Acknowledgments
Financial support for this research was provided by the National Science Council of Taiwan, ROC. The authors also thank Dr Kang-Ling Liau for providing compound 3.
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This paper is dedicated to Professor Kazuhiko Mizuno on the occasion of his retirement from Osaka Prefecture University.
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Lin, CK., Yang, JS. Fluorescence response of TICT-active aminostilbenes to copper(II) ions: redox reaction vs ion recognition. Res Chem Intermed 39, 19–32 (2013). https://doi.org/10.1007/s11164-012-0627-5
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DOI: https://doi.org/10.1007/s11164-012-0627-5