Selective Detection of Hg2+ Ions with Boron Dipyrromethene-Based Fluorescent Probes Appended with a Bis(1,2,3-triazole)amino Receptor
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
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Detail(s)
Original language | English |
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Pages (from-to) | 1059-1065 |
Journal / Publication | Chemistry - An Asian Journal |
Volume | 14 |
Issue number | 7 |
Online published | 18 Feb 2019 |
Publication status | Published - 1 Apr 2019 |
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Abstract
By using a copper-promoted alkyne–azide cycloaddition reaction, two boron dipyrromethene (BODIPY) derivatives bearing a bis(1,2,3-triazole)amino receptor at the meso position were prepared and characterized. For the analogue with two terminal triethylene glycol chains, the fluorescence emission at 509 nm responded selectively toward Hg2+ ions, which greatly increased the fluorescence quantum yield from 0.003 to 0.25 as a result of inhibition of the photoinduced electron transfer (PET) process. By introducing two additional rhodamine moieties at the termini, the resulting conjugate could also detect Hg2+ ions in a highly selective manner. Upon excitation at the BODIPY core, the fluorescence emission of rhodamine at 580 nm was observed and the intensity increased substantially upon addition of Hg2+ ions due to inhibition of the PET process followed by highly efficient fluorescence resonance energy transfer (FRET) from the BODIPY core to the rhodamine moieties. The Hg2+-responsive fluorescence change of these two probes could be easily seen with the naked eye. The binding stoichiometry between the probes and Hg2+ ions in CH3CN was determined to be 1:2 by Job′s plot analysis and 1H NMR titration, and the binding constants were found to be (1.2±0.1)×1011 m−2 and (1.3±0.3)×1010 m−2 , respectively. The overall results suggest that these two BODIPY derivatives can serve as highly selective fluorescent probes for Hg2+ ions. The rhodamine derivative makes use of a combined PET-FRET sensing mechanism which can greatly increase the sensitivity of detection.
Research Area(s)
- boron dipyrromethene, fluorescence resonance energy transfer, mercury sensors, photoinduced electron transfer, rhodamine
Citation Format(s)
Selective Detection of Hg2+ Ions with Boron Dipyrromethene-Based Fluorescent Probes Appended with a Bis(1,2,3-triazole)amino Receptor. / Shi, Wen-Jing; Liu, Jian-Yong; Lo, Pui-Chi et al.
In: Chemistry - An Asian Journal, Vol. 14, No. 7, 01.04.2019, p. 1059-1065.Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review