Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 228, Issue -, Pages 94-100Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.01.005
Keywords
Hg(II); Cysteine; Rhodamine B; Aggregation and deaggregation; Cell imaging
Funding
- National Natural Science Foundation of PR China [21271122]
- Research Project Supported by Shanxi Scholarship Council of China [2013-018]
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Many rhodamine B probes for metal ions and anions showing orange fluorescent have attracted a tremendous amount of attention. Herein a rhodamine B-based fluorescent probe 1 showing green fluorescence emission in the presence of Hg2+ was first reported. Self-assembled aggregation was proved to be the crucial factor for the green emitting fluorescence by means of resonance light scattering spectra, fluorescence spectra, ESI mass spectral analysis and SEM image. The probe 1 was developed as a excellent Hg(II)-selective green fluorescence agent in ethanol/HEPES buffer media (v/v = 3:7, pH 7.3) with a detection limit of 0.09 mu M. Meanwhile, the green fluorescence of 1-Hg2+ can be quenched severely by Cys but not for GSH, S2-, SO42-, SO32-, CN-, CO32- and HCY. The sequential switching effect for Hg2+ and then Cys has been achieved in aqueous media and bioimaging with satisfactory results. (C) 2016 Elsevier B.V. All rights reserved.
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