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Related Experiment Videos

A novel proton-selective sensor based on a sugar with hinge flexibility.

Hideya Yuasa1, Naohiko Fujii, Shun Yamazaki

  • 1Department of Life Science, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, 4259 J2-10, Nagatsutacho, Midoriku, Yokohama 226-8501, Japan. hyuasa@bio.titech.ac.jp

Organic & Biomolecular Chemistry
|August 31, 2007
PubMed
Summary
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This study developed a novel hinge sugar derivative that acts as a proton-selective sensor. N-alkylation enhances its ability to detect protons via fluorescence changes, making it useful for monitoring a wide range of proton concentrations.

Area of Science:

  • Carbohydrate Chemistry
  • Supramolecular Chemistry
  • Chemical Sensing

Background:

  • Hinge sugars are carbohydrate derivatives capable of conformational changes.
  • These molecules can switch between states, enabling applications in molecular switches.
  • N-alkylation is explored to modify the hinge sugar's properties.

Purpose of the Study:

  • To investigate the impact of N-alkylation on hinge sugar flexibility.
  • To synthesize and evaluate a N,N'-dipyrenylmethyl hinge sugar derivative as a proton sensor.
  • To understand the sensing mechanism based on conformational changes and fluorescence.

Main Methods:

  • Synthesis of N,N'-dipyrenylmethyl hinge sugar.
  • Proton nuclear magnetic resonance ((1)H NMR) spectroscopy to study conformational changes.

Related Experiment Videos

  • Fluorescence spectroscopy to monitor proton and metal ion interactions.

    • Main Results:

    • N-alkylation facilitates the (1)C(4) conformation in acidic conditions due to intramolecular hydrogen bonding.
    • The N,N'-dipyrenylmethyl derivative exhibits proton-selective fluorescence changes.
    • Excimer fluorescence at 445 nm is observed at low trifluoroacetic acid (TFA) concentrations, indicating pyrene stacking.
    • Monomer fluorescence at 375 nm increases at higher TFA concentrations.

    Conclusions:

    • The N,N'-dipyrenylmethyl hinge sugar functions as an effective proton-selective sensor.
    • The sensor operates by monitoring dual fluorescence maxima, enabling detection across a broad pH range.
    • Metal ion chelation does not significantly affect the fluorescence, confirming proton selectivity.