Abstract
Changes in the fluorescence intensity of anionic polymers bearing naphtho-18-crown-6 moieties on addition of cations were studied in water at 30 °C. On addition of alkali metal cations, the fluorescence intensity of the polymers decreased sharply for Tl+ less for Cs+ and little for Li+, K+ and Rb+. On addition of alkaline earth metal cations, Ba2+ caused the strongest decrease of the fluorescence intensity of the polymers. The decrease of the fluorescence intensity of the polymers was suggested to be caused by the external heavy-atom effect of the cations bound to the cavity of the crowned naphthalene moiety. The content of the crowned naphthalene units in the polymers affected the cation-dependent fluorescence change. The fluorescence change of the polymers based on the cation complexation competition was also studied.
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Shirai, M., Murakami, H. & Tsunooka, M. Cation-sensitive fluorescence of anionic polymers bearing naphtho-18-crown-6 units. J Fluoresc 6, 237–243 (1996). https://doi.org/10.1007/BF00732827
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DOI: https://doi.org/10.1007/BF00732827