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The porphyrin refers to the chelating ligand in the heme complex only, while the heme complex is the porphyrin ligand attached to the Fe (II). Porphyrin is a chelating ligand that is also tetradentate (meaning it bonds to the Fe at four different sites). The heme complex is square planar shaped. Beyond the 4 bonding sites with the porphyrin, the heme complex will bind with a protein to form myoglobin. The last of the 6 binding sites on the complex will attach to an O2 molecule. Read about the biological importance of myoglobin and hemoglobin (4 myoglobins) in the lecture notes as well.
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