Chemistry - A European Journal
Chemistry - A European Journal
5 years ago

Supramolecular Assembly Mediated by Metal Ions in Aqueous Solution and Its Application in Their Analysis

Supramolecular Assembly Mediated by Metal Ions in Aqueous Solution and Its Application in Their Analysis
Zhong-Zheng Gao, Qing Tang, Jing Zhang, Zhu Tao, Sheng-Chao Qiu, Ying Huang
A water-soluble fluorescent sensor based on the interaction of twisted cucurbit[14]uril (tQ[14]) and thiazole orange (TO) in aqueous solution was developed. Formation of the tQ[14]/TO complex gives rise to stronger fluorescence in both neutral and acidic aqueous solutions compared with that of free TO. Further experiments on the interaction of the tQ[14]/TO complex with metal ions revealed that, from a series of nineteen selected common metal ions, 1) only Hg2+ can lead to fluorescence enhancement and then quenching of the tQ[14]/TO (2:1) complex in neutral aqueous solution; 2) only Ba2+ can induce fluorescence quenching of the tQ[14]/TO (2:1) complex in aqueous HCl solution (pH 2); furthermore, the tQ[14]/TO/Ba2+ systems exhibit reversible changes in fluorescent intensity on successively adding SO42− and Ba2+; and 3) only Ba2+ or Pb2+ can induce fluorescence quenching of the tQ[14]/TO (15:1) complex in aqueous HCl solution (pH 2). Thus, the tQ[14]/TO complex can act as a supramolecular fluorescence-based sensor for the determination of Hg2+, Ba2+, and Pb2+ ions. Uniquely responsive: The interaction of thiazole orange (TO) with twisted cucurbit[14]uril (tQ[14]) was investigated, and formation of a stable fluorescent tQ[14]/TO complex was observed. The tQ[14]/TO complex exhibited unique fluorescence responses to Hg2+, Ba2+, and Pb2+ cations in different aqueous media (see figure). Thus, a fluorescent sensor for three heavy-metal ions was developed.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/chem.201700478

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