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Photoregulated ion binding

M Blank, L M Soo, H N Wassermann

    Science (New York, N.Y.)
    |October 2, 1981
    PubMed
    Summary
    This summary is machine-generated.

    A novel photoresponsive chelating agent, an azobenzene compound, binds zinc ions upon light exposure. This reversible photoisomerization enables potential applications in photoresponsive ion pumps.

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    Area of Science:

    • Supramolecular Chemistry
    • Photochemistry
    • Coordination Chemistry

    Background:

    • Development of photoresponsive materials for ion binding is crucial.
    • Azobenzene derivatives offer tunable photoisomerization properties.
    • Chelating agents with specific metal ion selectivity are highly sought after.

    Purpose of the Study:

    • To synthesize and characterize a novel photoregulated chelating agent.
    • To investigate the photoisomerization behavior of the azobenzene derivative.
    • To evaluate the zinc ion binding capabilities of the photoresponsive chelator.

    Main Methods:

    • Synthesis of a photochromic azobenzene compound with two iminodiacetic acid groups.
    • Photoisomerization studies using UV-Vis spectroscopy to monitor cis-trans conversion.

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  • Zinc ion binding assays to determine binding constants and stoichiometry.

    • Main Results:

    • The synthesized compound exists as cis and trans stereoisomers.
    • The trans isomer, upon irradiation at 320 nm, converts to the cis isomer.
    • The cis isomer exhibits cooperative binding of zinc ions with a binding constant of 1.1 x 10(5) +/- 9.2 x 10(5) L/mol.

    Conclusions:

    • A novel photoregulated chelating agent based on azobenzene has been successfully synthesized.
    • Photoisomerization reversibly modulates zinc ion binding affinity.
    • This class of compounds shows promise for developing photoresponsive ion pumps.