Changes in the fluorescence intensity of polyanions bearing 4′-acryloylbenzo-18-crown-6 units on the addition of cations were studied in a mixed solvent of methanol and water at 30°C. The sensitivity of the change in fluorescence intensities of the polymers toward cations was strongly enhanced compared to that of the corresponding model compound. When alkali metal cations were added, the fluorescence intensity of the polymers decreased in the orders Li+>Na+>Cs+>Rb+>K+ in a methanol-water (1∶9) mixture and Li+>Na+>Rb+>K+≃Cs+ in a methanol-water (9∶1) mixture. Alkaline earth metal cations and alkylamine hydrochlorides decreased the fluorescence intensity of the polymers in a methanol-water (1∶9) mixture. The cation-dependent decrease in the fluorescence intensity of the polymers was affected by the water fraction in a mixed solvent of methanol and water.
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Shirai, M., Ishimaru, S. & Tsunooka, M. Effect of solvent on the cation-sensitive fluorescence of polyanions bearing 4′-acryloylbenzo-18-crown-6 Units. J Fluoresc 3, 51–55 (1993). https://doi.org/10.1007/BF00865289
- Cation sensing
- poly(crown ether)
- solvent effect