Binuclear Electron-Paramagnetic-Resonance Signals of Arthropodan Methaemocyanins in the Presence of Nitrite

  • R. Witters
  • W. Deleersnijder
  • J.-P. Tahon
  • R. Lontie
Conference paper

Abstract

The deoxy- and oxyderivatives of haemocyanin are diamagnetic; in the oxyderivative the copper(II) ions in the binuclear copper site are strongly magnetically coupled. A strong interaction between the two copper(II) ions in a copper pair is favoured when only very few atoms form a superexchange pathway leading to a coupling of the unpaired spins. The copper(II) ions can also be magnetically coupled as a function of their distance and thus give rise in electron paramagnetic resonance (EPR) to a broad triplet signal near g = 2 and a weakly allowed signal at half field near g = 4, as observed for Helix pomatia methaemocyanin with acetate at pH 5.7 (1, 2).

Keywords

Peroxide Microwave Superoxide Nitrite Tate 

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References

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Copyright information

© Springer-Verlag Berlin Heidelberg 1986

Authors and Affiliations

  • R. Witters
    • 1
  • W. Deleersnijder
    • 1
  • J.-P. Tahon
    • 1
  • R. Lontie
    • 1
  1. 1.Laboratorium voor BiochemieKatholieke Universiteit to LeuvenLeuvenBelgium

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