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Facile preparation and potential application of water-soluble polymeric temperature/pH probes bearing fluorescein

Authors

  • Xiaolin Guan,

    1. College of Chemistry and Environmental Engineering, Chongqing Three Gorges University, Chongqing 404000, China
    2. Institute of Polymer Science and Engineering, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
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  • Shoujun Lai,

    Corresponding author
    1. College of Chemistry and Environmental Engineering, Chongqing Three Gorges University, Chongqing 404000, China
    • College of Chemistry and Environmental Engineering, Chongqing Three Gorges University, Chongqing 404000, China
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  • Zhixing Su

    1. Institute of Polymer Science and Engineering, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
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Abstract

An unsaturated monomer bearing xanthene groups and allyloxyfluorescein (Al-Flu), was synthesized from fluorescein and allyl bromide by etherification. The structure of the monomer was confirmed by IR and mass spectroscopy and 1H-NMR, and 13C-NMR spectroscopy. With azobisisobutyronitrile as a thermal initiator in tetrahydrofuran under 65–70°C, a copolymer of allyloxyfluorescein and acrylamide [poly(Al-Flu-co-AM)] was obtained and was characterized by the methods of IR spectroscopy, ultraviolet–visible spectroscopy, and differential scanning calorimetry. The experimental results show that the fluorescence spectra of water-soluble poly(Al-Flu-co-AM) was dependent on the pH and temperature in the solution. Moreover, poly(Al-Flu-co-AM) had an excellent linear response between the relative fluorescence intensity and temperature in the range 0–60°C and had a nonlinear response from pH 0.00 to 12.85 between the relative fluorescence intensity and pH. The pH and temperature sensitivities of the fluorescence could be advantageous for it as a multifunctional material to probe pH and temperature. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011.

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