Crowned spiropyran fluoroionophores with a carboxyl moiety for the selective detection of lithium ions?
Organic & Biomolecular Chemistry Pub Date: 2016-03-21 DOI: 10.1039/C6OB00468G
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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Journal Name：Organic & Biomolecular Chemistry
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CAS no.: 89640-58-4
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