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A novel rhodamine-based Hg2+ sensor with a simple structure and fine performance

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Abstract

An excellent spectral sensor for Hg2+ named 2-(2-((2-aminoethyl)thio)ethyl)-3′,6′-bis(diethylamino)spiro[isoindoline-1,9′-xanthen]-3-one (RMTE) was achieved by a one-step reaction between rhodamine B and thiobisethylamine. RMTE could detect Hg2+ in nearly pure water reversibly and highly selectively, indicated by a new increasing absorption peak at 561 nm and 170-fold enhanced fluorescence at 578 nm coupled with remarkable visual and fluorescence color changes. When the Hg2+ concentration ([Hg2+]) varied from 0 to 120 μM, the absorbance and fluorescence intensity of the RMTE solution responded linearly to [Hg2+] with the detection limits of 2.08 and 0.14 μM, respectively. RMTE could work in ecologically and biologically favorable pH values of 6.41–8.33. The binding mode of RMTE toward Hg2+ was 1 : 1. RMTE could monitor Hg2+ in environmental water and living cells effectively with low cytotoxicity.

Graphical abstract: A novel rhodamine-based Hg2+ sensor with a simple structure and fine performance

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Publication details

The article was received on 20 Aug 2019, accepted on 29 Sep 2019 and first published on 30 Oct 2019


Article type: Paper
DOI: 10.1039/C9AN01608B
Analyst, 2019, Advance Article

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    A novel rhodamine-based Hg2+ sensor with a simple structure and fine performance

    M. Hong, Y. Chen, Y. Zhang and D. Xu, Analyst, 2019, Advance Article , DOI: 10.1039/C9AN01608B

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