Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 230, Issue -, Pages 639-644Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.02.125
Keywords
Chemodosimeter; Ratiometric fluorescence; Mercury detection; Intramolecular charge transfer; Phenanthroimidazole
Funding
- National Natural Science Foundation of China [21577098]
- Foundation of State Key Laboratory of Pollution Control and Resource Reuse, China [PCRRK13024]
- Knut and Alice Wallenberg Foundation (KAW) [2012.0083]
- Swedish Government strategic faculty grant in material science (SFO, MATLIU) in Advanced Functional Materials (AFM) (VR) [5.1-2015-5959]
- International Exchange Program for Graduate Students of Tongji University [201502013]
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We design and synthesize a new ratiometric fluorescent chemodosimeter (S1) for the selective and sensitive detection of Hg2+. Upon addition of Hg2+, the emission of the S1 exhibits a large bathochromic shift from 393 to 515 nm (up to 122 nm) which is ascribed to an intramolecular charge transfer process in the resultant. The Hg2+-induced dethioacetalization for sensing mechanism has been demonstrated by using high-performance liquid chromatography analysis of the sensing process. The interference experiments further demonstrate that S1 exhibits very high selectivity towards Hg2+ over other coexisting cations/anions. Subsequently, a good linearity of the concentrations of Hg2+ (0-15 mu M) vs the ratiometric signals (I-515/I-393) allows a fluorogenic method for the quantitative detection of Hg2+, with the limitation of detection determined to be 5.22 x 10(-7) M. (C) 2016 Elsevier B.V. All rights reserved.
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