A cyanine‐based dual‐modal probe for fluorimetric detection of mercury ion and colorimetric sensing of pH. (23rd March 2022)

• Record Type: Journal Article
• Authors: Li, Yanjie; Qi, Youguo; Xu, Zhenxiang; Song, Yanxi; Li, Hongqi; Zhang, Jian; Tang, Junjie; Zhou, Jun
• Is Part Of: Coloration technology. Volume 138:Number 4(2022)
• Page Start: 427
• Page End: 439
• Publication Date: 2022-03-23
• Subjects: Color -- Periodicals; Color in the textile industries -- Periodicals; Dyes and dyeing -- Periodicals; 667
• DOI: 10.1111/cote.12603
• Languages: English
• ISSNs: 1472-3581

Abstract

Abstract: A fluorescent probe derived from cyanine‐rhodanine conjugate was developed for dual detection of mercury (Hg 2+ ) ion and pH. Addition of Hg 2+ ion to the weakly fluorescent probe solution in dimethyl sulphoxide/water (DMSO/H2 O, 7:3, v/v ) induced discernible colour change and fluorescence enhancement while other metal cations including Li +, Na +, K +, Ag +, Cu 2+, Fe 2+, Zn 2+, Co 2+, Ni 2+, Mn 2+, Sr 2+, Ca 2+, Mg 2+, Al 3+, Cr 3+ and Fe 3+ did not cause obvious change in colour and fluorescence emission. The detection limit of the probe toward Hg 2+ ion is 1.61 × 10 −7 M. The probe also exhibited remarkable pH‐responsive effect. It acts as a dual chromogenic and spectroscopic probe for determining different pH scales over a wide range of pH 1.0–14.0: bright yellow with maximum wavelength ( λ max ) 416 nm for pH 1.0–2.0, orange with λ max 470 nm for pH 3.0–9.0, and pale yellow with λ max below 400 nm for pH 10.0–14.0. Plausible sensing mechanisms of the probe toward Hg 2+ ion and pH have been proposed.