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- W2057222519 endingPage "1300" @default.
- W2057222519 startingPage "1294" @default.
- W2057222519 abstract "New N-(pyrenylmethyl)naphtho-azacrown-5 (1) was synthesized as an ‘On–Off’ fluorescent chemosensor for Cu2+. Excited at 240 nm corresponding to the absorption of naphthalene unit (energy donor) of 1, emission at 380 nm from pyrene unit (energy acceptor) is observed, indicating that intramolecular fluorescence resonance energy transfer (FRET-On) occurs in 1. When Cu2+ is added to a solution of 1, however, the fluorescence of pyrene is strongly quenched (FRET-Off) whereas that of naphthalene group is revived. Such FRET ‘On–Off’ behavior of 1 is observed only in the case of Cu2+ binding, but not for other metal cations. The high selectivity of 1 toward Cu2+ can be potentially applied to a new kind of FRET-based chemosensor. The FRET On–Off behavior is supported by computational studies. The calculated molecular orbitals of HOMO and LUMOs suggest the excited-state interactions leading to FRET from naphthalene to pyrene in 1, but no electron density changes in 1·Cu2+ complex." @default.
- W2057222519 created "2016-06-24" @default.
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- W2057222519 date "2008-02-01" @default.
- W2057222519 modified "2023-10-17" @default.
- W2057222519 title "FRET-derived ratiometric fluorescence sensor for Cu2+" @default.
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- W2057222519 doi "https://doi.org/10.1016/j.tet.2007.11.063" @default.
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