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Novel sulfonamidospirobifluorenes as fluorescent sensors for mercury(ii) ion and glutathione.

ABSTRACT: Novel spirobifluorene derivatives containing two and four sulfonamide groups are successfully synthesized from the commercially available bromo-9,9'-spirobifluorene by Sonogashira couplings. These compounds exhibit an excellent selective fluorescence quenching by Hg(ii) in DMSO/HEPES buffer mixture with three-times-noise detection limits of 10.4 to 103.8 nM. A static aggregation induced quenching mechanism is proposed based on the data from ¹H-NMR and UV-Vis spectroscopy, as well as the observation of the Tyndall effect. Quantifications of Hg(ii) using these sensors are in good agreement with those obtained from ICP-OES. The reversibility of these sensors is demonstrated by a complete fluorescence restoration upon addition of EDTA or l-glutathione. The application as a turn-on sensor for l-glutathione is demonstrated in a quantitative analysis of three samples of l-glutathione supplement drinks.

SUBMITTER: Silpcharu K

PROVIDER: S-EPMC9063287 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature

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Novel sulfonamidospirobifluorenes as fluorescent sensors for mercury(ii) ion and glutathione.

Silpcharu Komthep K Sukwattanasinitt Mongkol M Rashatasakhon Paitoon P

RSC advances 20190411 20

Novel spirobifluorene derivatives containing two and four sulfonamide groups are successfully synthesized from the commercially available bromo-9,9'-spirobifluorene by Sonogashira couplings. These compounds exhibit an excellent selective fluorescence quenching by Hg(ii) in DMSO/HEPES buffer mixture with three-times-noise detection limits of 10.4 to 103.8 nM. A static aggregation induced quenching mechanism is proposed based on the data from <sup>1</sup>H-NMR and UV-Vis spectroscopy, as well as t ...[more]

PMID: 35520214

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