title: Substituent effects on the formation constants of iron(III) and iron (II) tetraphenylporphyrin-pyridine complexes.
mesh_terms: D005290:Ferric Compounds; D005296:Ferrous Compounds; D008665:Metalloporphyrins; D011725:Pyridines
chemical_list: D005290:Ferric Compounds; D005296:Ferrous Compounds; D008665:Metalloporphyrins; D011725:Pyridines