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Related Experiment Videos

pH indicating resins.

Jin Ku Cho1, Lu Shin Wong, Tony W Dean

  • 1Combinatorial Centre of Excellence, School of Chemistry, University of Southampton, Highfield, Southampton, UK SO17 1BJ.

Chemical Communications (Cambridge, England)
|June 25, 2004
PubMed
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New pH indicating resins were created by attaching sulfthalein dyes to beads. These novel resin-bound indicators exhibit reliable colorimetric pH changes, confirmed by micro UV/Vis spectroscopy.

Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Traditional pH indicators often require solution-based measurements.
  • Developing solid-state pH sensors offers advantages in handling and reusability.
  • Sulfonphthalein dyes are known for their pH-dependent colorimetric properties.

Purpose of the Study:

  • To synthesize novel pH indicating resins by immobilizing sulfthalein dye derivatives.
  • To investigate the pH-responsive colorimetric behavior of the synthesized resin-bound indicators.
  • To evaluate the performance of these solid-state indicators using micro UV/Vis spectroscopy.

Main Methods:

  • Synthesis of carboxylic acid derivatives of sulfthalein dyes via Suzuki cross-coupling.
  • Covalent attachment of dye derivatives onto polymer resin beads.

Related Experiment Videos

  • Characterization of resin-bound indicators using micro UV/Vis spectroscopy for pH response analysis.

    • Main Results:

    • Successfully prepared pH indicating resins with covalently attached sulfthalein dye derivatives.
    • Resin-bound indicators demonstrated distinct and expected color changes corresponding to variations in pH.
    • Micro UV/Vis spectroscopic analysis confirmed the reliable pH-indicating performance of the immobilized dyes.

    Conclusions:

    • The developed method provides a robust way to create solid-state pH indicators.
    • Covalently immobilized sulfthalein dyes on resin beads function effectively as visual and spectroscopic pH sensors.
    • These resin-bound indicators offer a promising alternative for applications requiring convenient and reusable pH monitoring.