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

✍ Scribed by Xiaolin Guan; Shoujun Lai; Zhixing Su

• Publisher: John Wiley and Sons
• Year: 2011
• Tongue: English
• Weight: 674 KB
• Volume: 122
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.34038

✦ Synopsis

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 1 H-NMR, and 13 C-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. V