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A designed receptor for pH-switchable ion binding in water.

Stephen G Tajc1, Benjamin L Miller

  • 1Department of Biochemistry and Biophysics, University of Rochester, New York 14642, USA.

Journal of the American Chemical Society
|February 24, 2006
PubMed
Summary
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Researchers developed a novel molecule with pH-switchable properties. This receptor binds ions at high pH, demonstrating potential for chemical sensing applications.

Area of Science:

  • Supramolecular Chemistry
  • Chemical Sensing
  • Molecular Recognition

Background:

  • Molecules with switchable properties are crucial for applications like chemical sensing.
  • Hydrogen bonds are key structural elements in designing responsive molecules.
  • Understanding pH-dependent conformational changes is vital for molecular design.

Purpose of the Study:

  • To synthesize a novel receptor molecule with pH-switchable conformational properties.
  • To investigate the role of phenol-amine hydrogen bonds in controlling molecular conformation.
  • To evaluate the molecule's potential as a pH-dependent ion receptor.

Main Methods:

  • Synthesis of a novel receptor via peracylation of cyclohexane 1,3,5-trimethanol with tyrosine.
  • Nuclear Magnetic Resonance (NMR) spectroscopy, including proton longitudinal relaxation rates and NOESY experiments, to assess pH-dependent conformational changes.

Related Experiment Videos

  • UV-vis titrations and Isothermal Titration Calorimetry (ITC) to study anion and cation binding.

    • Main Results:

    • The synthesized receptor exhibited pH-dependent changes in proton longitudinal relaxation rates, unlike related structures.
    • NOESY spectra showed significant changes with pH, indicating a pH-induced conformational switch to a 'closed' state at pH 9.5.
    • The molecule demonstrated selective binding of anions and cations in aqueous solution at high pH, but not at low pH.

    Conclusions:

    • The phenol-amine hydrogen bond is an effective structural motif for creating pH-switchable molecular conformations.
    • The novel receptor displays conditional binding properties, functioning as an ion receptor only at higher pH.
    • This work provides a foundation for designing advanced molecules for pH-controlled chemical sensing and molecular recognition.