Journal
TALANTA
Volume 210, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2019.120634
Keywords
Palladium; Chemosensor; Fluorescence; Rhodamine
Categories
Funding
- State Key Laboratory of Environmental and Biological Analysis [SKLP-1718-P03]
- Hong Kong Baptist University
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In this study, we report a new class of rhodamine-based fluorescent sensors for highly selective and sensitive detection of Pd2+ ions in aqueous medium. A rhodamine-based palladium sensor RPS and a coumarin-rhodamine Forster resonance energy transfer (FRET)-pair based palladium sensor FPS were synthesized with the designed podand ligand for Pd2+ ion recognition. They showed both colorimetric change and fluorometric change in the presence of Pd2+ ion due to the opening of their spirolactam rings. Both chemosensors are highly selective to Pd2+ over the other 24 different metal ions and they are selective to palladium species in +2 oxidation state, RPS showed a 70-fold fluorescent turn-on while FPS showed a 1.75-fold ratiometric change at I-599/I-470. Furthermore, RPS showed low cell cytotoxicity and it was successfully used to image Pd2+ in BEAS-2B lung epithelial cells. (C) 2019 Elsevier Science. All rights reserved.
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