Molecular Science and Biomedicine Laboratory, State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering and College of Biology, Hunan University, Changsha, China
College of Sciences, China Agricultural University, Beijing 100193, PR China
Anal. Methods, 2013,5, 3909-3914
06 Mar 2013,
14 May 2013
First published online
15 May 2013
Aggregation-induced emission (AIE) dyes show different emission mechanism from traditional dyes, which were found to be nonluminescent in the solution state and emissive in the aggregate state, and have been well employed to design turn-on fluorescent probes for various targets. In this paper, we report for the first time a tetraphenylethylene-based AIE probe 1 for Al3+, which employed two diethylenetriamine units as the recognition ligand for Al3+. In the presence of Al3+, a large fluorescence enhancement was achieved for probe 1, which together with the low background fluorescence of free probe 1 allow for high sensitivity for Al3+, with a dynamic range from 2.0 × 10−6 to 1.1 × 10−5 M observed, and a detection limit of 5 × 10−7 M for Al3+. The proposed probe shows high selectivity to Al3+. UV-vis absorption spectra experiments and dynamic light scattering measurements were performed to verify the AIE sensing mechanism of probe 1. Moreover, a 1:1 stoichiometry was estimated for the 1–Al3+ complex via fluorescence Job's method.
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