Soft matter pH sensing: from luminescent lanthanide pH switches in solution to sensing in hydrogels

Colin McCoy, F. Stomeo, S.E. Plush, T. Gunnlaugsson

Research output: Contribution to journalArticlepeer-review

97 Citations (Scopus)

Abstract

The synthesis, complexation, and photophysical properties of the Eu(III)-based quinoline cyclen conjugate complex Eu1 and its permanent, noncovalent incorporation into hydrogels as sensitive, interference-free pH sensing materials for biological media are described. The Eu(III) emission in both solution and hydrogel media was switched reversibly on-off as a function of pH with a large, greater than order of magnitude enhancement in Eu(III) emission. The irreversible incorporation of Eu1 into water-permeable hydrogels was achieved using poly[methyl methacrylate-co-2-hydroxyethyl methacrylate]- based hydrogels, and the luminescent properties of the novel sensor materials, using confocal laser- scanning microscopy and steady state luminescence, were characterized and demonstrated to be retained with respect to solution behavior. Water uptake and dehydration behavior of the sensor-incorporated materials was also characterized and shown to be dependent on the material composition.
Original languageEnglish
Pages (from-to)4336-4343
Number of pages8
JournalChemistry of Materials
Volume18(18)
Issue number18
DOIs
Publication statusPublished - 05 Sep 2006

ASJC Scopus subject areas

  • Materials Chemistry
  • Materials Science(all)

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