Is aqua-meth-myoglobin (Fe3+) paramagnetic? In this case, the iron has all 6 coordination positions occupied by ligands: 4 nitrogen atoms from the pyrrolic rings that compose the porphyrin, 1 nitrogen atom in the axial position from the imidazolic system of the distal histidine and in the other axial position is water (or OH - in the case of hyroxy-meth-myoglobin). Being different ligands, I don't know whether to consider that the ligands are strong or weak field and implicitly I don't know how the configuration of the iron will be after coordination. My assumption is that it remains with 5 unpaired electrons, if the ligands are weak field.
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