Journal
JOURNAL OF FLUORESCENCE
Volume 28, Issue 3, Pages 795-800Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10895-018-2241-4
Keywords
Fluorescence; Pyridylthiazole; Ratiometric sensor; Mercury ion; ICT; Imaging
Funding
- National Natural Science Foundation of China [NSFC 21062023, 21768004]
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As a structural analogue of pyridylthiazole, 2-(2-benzothiazoyl)-phenylethynylquinoline (QBT) was designed as a fluorescent probe for Hg(II) based on an intramolecular charge transfer (ICT) mechanism. The compound was synthesized in three steps starting from 6-bromo-2-methylquinoline, with moderate yield. Corresponding studies on the optical properties of QBT indicate that changes in the fluorescence ratio of QBT in response to Hg(II) could be quantified based on dual-emission changes. More specifically, the emission spectrum of QBT before and after interactions with Hg(II) exhibited a remarkable red shift of about 120 nm, which is rarely reported in ICT-based fluorescent sensors. Finally, QBT was applied in the two-channel imaging of Hg(II) in live HeLa cells.
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