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A sugar discriminating binuclear copper(II) complex.

Susanne Striegler1, Michael Dittel

  • 1Division of Inorganic Chemistry II, University of Ulm, Albert-Einstein-Allee 11, D-89069 Ulm, Germany. susanne.striegler@chemie.uni-ulm.de

Journal of the American Chemical Society
|September 18, 2003
PubMed
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This study shows a copper(II) complex can distinguish between similar sugars in alkaline solutions. This carbohydrate discrimination is due to how sugar hydroxyl groups bind to the metal complex.

Area of Science:

  • Coordination Chemistry
  • Analytical Chemistry
  • Carbohydrate Chemistry

Background:

  • Binuclear copper(II) complexes offer unique coordination environments.
  • Selective carbohydrate recognition remains a challenge in analytical chemistry.
  • Understanding metal-carbohydrate interactions is crucial for developing sensors.

Purpose of the Study:

  • To investigate the complex formation between a binuclear copper(II) complex (1, Cu(2)(bpdpo)) and underivatized carbohydrates.
  • To evaluate the discrimination ability of complex 1 for structurally similar monosaccharides.
  • To elucidate the binding mechanism and factors influencing carbohydrate recognition.

Main Methods:

  • UV/vis and Circular Dichroism (CD) spectroscopy were employed.

Related Experiment Videos

  • pH-dependent spectrophotometric titration determined the complex species.
  • Spectroscopic data analyzed to quantify binding strengths and spectral shifts.

    • Main Results:

    • Complex 1 demonstrated significant discrimination between closely related monosaccharides in alkaline solution (pH 11-13).
    • The dominating species at pH 11-13 was identified as [Cu(2)L(-)(H)(OH)(2)](+).
    • Binding strengths differed by 1.5 orders of magnitude for d-mannose and d-glucose at pH 12.40, with distinct spectral shifts (blue/red) observed upon binding.

    Conclusions:

    • The binuclear copper(II) complex 1 exhibits high selectivity for carbohydrate recognition.
    • The number of hydroxyl groups involved in chelation directly impacts binding affinity and spectral properties.
    • This work highlights the potential of complex 1 as a sensor for differentiating carbohydrates.