Abstract
Abstract Nuclear magnetic relaxation dispersion measurements are reported for aqueous solutions of iron(III)-EDTA complexes at high pH and high ionic strength where the dominant species is the μ-oxo dimer. Formation of the dimeric species leaves only the outer coordination sphere contribution to the paramagnetic relaxation rate of the water protons in solution. The relaxation efficiency is further decreased by the decrease in the effective magnetic moment due to antiferromagnetic coupling. This result is in distinction to dimeric species that form with Gd(HEDTA) complexes at high pH in which antiferromagnetic coupling has not been observed to decrease the effective magnetic moment.
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