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. 2018 Sep 5:202:252-259.
doi: 10.1016/j.saa.2018.05.050. Epub 2018 May 16.

A highly selective and reversible fluorescence "OFF-ON-OFF" chemosensor for Hg2+ based on rhodamine-6G dyes derivative and its application as a molecular logic gate

Cui-Bing Bai  1 , Rui Qiao  2 , Jia-Xin Liao  3 , Wen-Zhang Xiong  3 , Jie Zhang  3 , Shui-Sheng Chen  1 , Song Yang  1
Affiliations

A highly selective and reversible fluorescence "OFF-ON-OFF" chemosensor for Hg2+ based on rhodamine-6G dyes derivative and its application as a molecular logic gate

Cui-Bing Bai et al. Spectrochim Acta A Mol Biomol Spectrosc. .

Abstract

A new rhodamine-6G-based chemosensor X was designed and synthesized for the colorimetric and fluorometric detection of Hg2+. The chemosensor X responsed to Hg2+ had good sensitivity, high selectivity and excellent reversibility in HEPES buffer (10 mM, pH 7.4)/CH3CN (40:60, V/V). The recognition mechanism of X toward Hg2+ was evaluated by Job's plot, IR and MS. Meanwhile, X-Hg2+ fluorescence lifetime was also measured. It was interesting that X displayed favorable reversibility to form an "off-on-off" type signaling behavior with the Hg2+-induced emission spectra being quenched by I-. Furthermore, it could be applied as a molecular logic gate and test strips based on X exhibited a good reversibility selectivity to Hg2+.

Keywords: Fluorescent probes; Iodide ion; Mercury ion; Molecular logic gate; Rhodamine-6G.

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