A dual chemosensor for Cu2+ and Hg2+ based on a rhodamine-terminated water-soluble polymer in 100% aqueous solution. Issue 22 (8th October 2018)

• Record Type: Journal Article
• Authors: Li, Guang; Bai, Liping; Tao, Farong; Deng, Aixia; Wang, Liping
• Is Part Of: Analyst. Volume 143:Issue 22(2018)
• Page Start: 5395
• Page End: 5403
• Publication Date: 2018-10-08
• Subjects: Chemistry, Analytic -- Periodicals; 543
• DOI: 10.1039/c8an01130c
• Languages: English
• ISSNs: 0003-2654

Abstract

Abstract : A dual chemosensor based on rhodamine-terminated PEG was developed for the simultaneous selective detection of Cu 2+ and Hg 2+ in water. Abstract : A novel water-soluble polymer bearing a rhodamine receptor (PEGSRh) was synthesized as a dual chemosensor for the recognition of Cu 2+ and Hg 2+ in 100% aqueous solution. PEGSRh not only exhibited a sensitive colorimetric response towards Cu 2+ and Hg 2+ but also showed a selective turn-on fluorescence response towards Hg 2+ over other metal ions. The binding stoichiometry for the complexation of PEGSRh with Cu 2+ and Hg 2+ was confirmed to be 1 : 1 by Job plot analysis. The low detection limits were found to be 5.92 × 10 −7 M for Cu 2+ and 2.85 × 10 −6 M for Hg 2+ . The responses of PEGSRh to Cu 2+ and Hg 2+ were both stable over wide pH ranges. In addition, the fluorescence intensity changes of PEGSRh solution by the inputs of Hg 2+, Cu 2+ and EDTA have been used to construct a combinational logic gate. Again, an INHIBIT logic gate was also obtained by employing Cu 2+ and EDTA as the chemical inputs and the absorbance signal as the output. Moreover, test papers were prepared facilely using PEGSRh for practical on-site detection of Cu 2+ and Hg 2+ .