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. 2018 Nov 7:1030:172-182.
doi: 10.1016/j.aca.2018.05.013. Epub 2018 May 5.

A near-infrared fluorescent probe for selective and quantitative detection of fluoride ions based on Si-Rhodamine

Man Du  1 , Baolong Huo  1 , Jiemin Liu  2 , Mengwen Li  1 , Leqiu Fang  1 , Yunxu Yang  3
Affiliations

A near-infrared fluorescent probe for selective and quantitative detection of fluoride ions based on Si-Rhodamine

Man Du et al. Anal Chim Acta. .

Abstract

A highly selective fluorescent probe (SiROPS) based on Si-rhodamine (SiR) towards F- was investigated. SiROPS can realize the NIR detection of F- because of the long fluorescent wavelength (λex = 650 nm, λem = 669 nm). The near-IR optical and the ratiometric fluorescence type signaling were realized by employing fluoride-selective cleavage of the latent thiophosphinated probe in mixed aqueous media. The cleavage of F- to the ortho positions of dimethylphosphinothionyl group in the meso aryl involves the suppression of internal rotation upon phosphorylation of a reactive phenolate and the activating rotation of o-OH, which resulting in a large fluorescence "Turn-Off" response. The detection limit of the probe to F- was 48 nM in the dynamic range of 0.5 μM-20 μM. In addition, the proposed probe has been used to detect F- in water samples and toothpaste samples with satisfying results.

Keywords: Fluorescence probe; Fluoride ions; Near-infrared; Si-rhodamine.

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