Iron(III) octaethylporphine chloride is a coordination complex containing iron and porphyrin ligands. It is often used as a model compound to study the electronics and magnetism of heme proteins, which play important roles in various biological processes such as oxygen transport and metabolism. Iron(III) octaethylporphine chloride has a variety of applications in biochemical and biophysical research, including as a probe to study protein-ligand interactions and as a catalyst for oxidation reactions. In addition, it can be used as a photosensitizer in photodynamic therapy for the improvement of cancer and other diseases.