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 Cham-Fai Leung

doi:10.1016/j.talanta.2019.120634

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

Talanta. 2020 Apr 1:210:120634. doi: 10.1016/j.talanta.2019.120634. Epub 2019 Dec 14.

Authors

Fung-Kit Tang¹, Sing-Ming Chan¹, Tao Wang¹, Chak-Shing Kwan¹, Regina Huang¹, Zongwei Cai², Ken Cham-Fai Leung³

Affiliations

¹ Department of Chemistry and State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University, Kowloon Tong, Kowloon, Hong Kong, China.
² Department of Chemistry and State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University, Kowloon Tong, Kowloon, Hong Kong, China. Electronic address: zwcai@hkbu.edu.hk.
³ Department of Chemistry and State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University, Kowloon Tong, Kowloon, Hong Kong, China. Electronic address: cfleung@hkbu.edu.hk.

PMID: 31987194
DOI: 10.1016/j.talanta.2019.120634

Abstract

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. © 2019 Elsevier Science. All rights reserved.

Keywords: Chemosensor; Fluorescence; Palladium; Rhodamine.

MeSH terms

Cells, Cultured
Colorimetry*
Fluorescent Dyes / chemistry*
Humans
Lead / analysis*
Molecular Structure
Optical Imaging
Rhodamines / chemistry*
Solutions
Spectrometry, Fluorescence
Water / chemistry
Water Pollutants, Chemical / analysis*

Substances

Fluorescent Dyes
Rhodamines
Solutions
Water Pollutants, Chemical
Water
Lead