期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 255, 期 -, 页码 2086-2094出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2017.09.008
关键词
Fluorescent probe; Aggregation-induced emission; Dual-channel; Mercury ion; Silver ion; Imaging agents
资金
- National Natural Science Foundation of China [21675126, 21375106, 21202132]
- Fund of Youth Science and Technology Stars by Shaanxi Province [2015KJXX-15]
- Fundamental Research Funds for the Central Universities [2452016123]
The sensitive detection and quantification of heavy and transition metal ions are particularly important. Among them, mercury(II) (Hg2+) and silver(I) (Ag+) ions, as the most ubiquitous heavy metal ion pollutants, are difficult to discriminate in the same system because of their similar reactions and coordination abilities. Herein, we designed and synthesized a turn-on chemosensor, RBTP, which is an intergrant of rhodol and 2-hydroxy benzothiazole by introducing a benzothiazole unit to the ortho-position of the phenolic hydroxy of rhodol. RBTP showed a sensitive dual-channel fluorescence-enhanced response to Hg2+ and Ag+ at 595 and 520 nm with low detection limits of 0.27 and 0.45 mu M, respectively. Studies of their sensing mechanism indicated that the Hg2+-induced orange fluorescence at 595 nm originates from an irreversible Hg2+-promoted oxadiazole forming reaction and the Ag+-induced green fluorescence at 520 nm originates from special molecular packing of the RBTP-Ag+ complex. Furthermore, the potential of probe RBTP as practical biological imaging agents was further confirmed in HepG2 cells. Simultaneously, RBTP exhibited remarkable solid-state luminescence with an aggregation-induced emission (AIE) feature. The AIE mechanism was thoroughly explored using X-ray single-crystal structures and photophysical determinations. (C) 2017 Elsevier B.V. All rights reserved.
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