Magnetic susceptibility study of hemerythrin using an ultrasensitive magnetometer

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Abstract

The magnetic susceptibilities of oxy- and metaquohemerythrin
\nin the range 3-200°K have been determined using an ultrasensitive superconducting quantum magnetometer, and for the first time their antiferromagnetic components have been conclusively resolved. The exchange coupling constants, J, between the two high-spin iron(III) atoms in
\neach subunit are -77 and -134 cm^(-1), respectively. The electronic spectra of these two proteins in deuterium oxide have been measured from 800 to 1200 nm but no additional bands were obtained. After comparison to magnetic and spectroscopic data obtained previously for ferric dimer model complexes, it is concluded that the two iron(III) atoms in subunits of both oxy- and metaquohemerythrin are oxo bridged.

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