Highly selective detection of Pd2+ ion in aqueous solutions with rhodamine-based colorimetric and fluorescent chemosensors

Fung Kit Tang, Sing Ming Chan, Tao Wang, Chak Shing Kwan, Regina Huang, Zongwei CAI, Ken C F LEUNG*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


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 Förster 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 I599/I470. Furthermore, RPS showed low cell cytotoxicity and it was successfully used to image Pd2+ in BEAS-2B lung epithelial cells.

Original languageEnglish
Article number120634
Publication statusPublished - 1 Apr 2020

Scopus Subject Areas

  • Analytical Chemistry

User-Defined Keywords

  • Chemosensor
  • Fluorescence
  • Palladium
  • Rhodamine


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