1. 1,8-Naphthyridine-Derived Ni2+/Cu2+-Selective Fluorescent Chemosensor with Different Charge Transfer Processses.
- Author
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Zhanxian Li, Wanying Zhao, Xiaoya Li, Yanyan Zhu, Chunmei Liu, Lina Wang, Mingming Yu, Liuhe Wei, Mingsheng Tang, and Hongyan Zhang
- Subjects
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NAPHTHYRIDINES , *METAL ions , *CHARGE transfer , *FLUORESCENCE , *CHEMORECEPTORS , *AQUEOUS solutions , *ETHYLENEDIAMINE - Abstract
A highly fluorescent chemosensor based on 1,8-naphthyridine with high sensitivity and selectivity toward Ni2+/Cu2+ over other cations both in aqueous solution over a wide pH range (4--10) and in cellular environments was developed. Counteranions such as acetate, sulfate, nitrate, and perchlorate have no influence on the detection of such metal ions. Ethylenediamine showed high selectivity toward the in situ-prepared Cu2+ complex over die Ni2+ complex, which can be applied to distinguish Ni2+ and Cu2+. The Ni2+-induced fluorescence on--off mechanism was revealed to be mediated by intramolecular charge transfer from the metal to the ligand, while that by Cu2+ involves intramolecular charge transfer from the ligand to the metal, as confirmed by picosecond time-resolved fluorescence spectroscopy and time-dependent density functional theory calculations. [ABSTRACT FROM AUTHOR]
- Published
- 2012
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