1,8-Naphthyridine-Derived Ni2+/Cu2+-Selective Fluorescent Chemosensor with Different Charge Transfer Processses

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• 作者：Zhanxian Li ; Wanying Zhao ; Xiaoya Li ; Yanyan Zhu ; Chunmei Liu ; Lina Wang ; Mingming Yu ; Liuhe Wei ; Mingsheng Tang ; Hongyan Zhang
• 刊名：Inorganic Chemistry
• 出版年：2012
• 出版时间：November 19, 2012
• 年：2012
• 卷：51
• 期：22
• 页码：12444-12449
• 全文大小：401K
• 年卷期：v.51,no.22(November 19, 2012)
• ISSN：1520-510X

文摘

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鈥?0) 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 the Ni²⁺ complex, which can be applied to distinguish Ni²⁺ and Cu²⁺. The Ni²⁺-induced fluorescence on鈥搊ff 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.