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  • Title: A near-infrared fluorescent probe for selective and quantitative detection of fluoride ions based on Si-Rhodamine.
    Author: Du M, Huo B, Liu J, Li M, Fang L, Yang Y.
    Journal: Anal Chim Acta; 2018 Nov 07; 1030():172-182. PubMed ID: 30032767.
    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.
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