Summary
Magnetic measurements on iron(III)-complexes of amino acids show that in these compounds, as also in Ferritin, there are 3 unpaired electrons for each iron atom. From this it follows that, according to the Pauling theory, there is a square-planar arrangement of the 4 ligands.
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References
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Bayer, E., Hauser, K.H. Eisen(III)-Komplexe mit 3 ungepaarten Elektronen. Experientia 11, 254–255 (1955). https://doi.org/10.1007/BF02161240
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DOI: https://doi.org/10.1007/BF02161240