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  • Title: Crowned spiropyran fluoroionophores with a carboxyl moiety for the selective detection of lithium ions.
    Author: Stubing DB, Heng S, Abell AD.
    Journal: Org Biomol Chem; 2016 Apr 12; 14(15):3752-7. PubMed ID: 27001932.
    Abstract:
    The absorbance and fluorescence spectra of carboxylated spiropyrans containing methyl-1-aza-12-crown-4, methyl-1-aza-15-crown-5, methyl-1-aza-18-crown-6 moieties are compared. Characteristic changes in spectra after addition of the alkali metal salts of Li(+), Na(+), K(+) and Cs(+) were observed. Chromism induced by the binding of the metal cations was observed as an increase in absorbance and fluorescence. Of these metal cations, the Li(+) ion produced the largest change in all three spiropyran systems. Reversible photoswitching of the spiropyran-metal complexes was observed on irradiation with alternating 352 nm UV and white light. This results in reversible fluorescence based sensing of lithium ions with potential for use in a biological sensor device.
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