A porphyrin is a heterocyclic macrocycle derived from porphine, a molecule that consists of four pyrrole rings joined together by four methine (=CH-) groups to form a larger macrocycle ring. Substituted porphines are called porphyrins. Many porphyrins occur in nature, and fulfil important biochemical roles. Porphyrins can bind metals to form complexes. The metal ion, usually with a charge of 2+ or 3+, resides in the central cavity formed by the loss of two protons. Many metals are found with different derivatives, including Fe, Mg, Ni, Co and Zn. The name porphyrin comes from a Greek word for purple, since most porphyrins are red to purple in color. More reduced porphyrins, such as corphins, are yellowish.
Chemical Formula: C20H14N4
magnesium-protoporphyrin IX 13-monomethyl ester,
Monoisotopic Molecular Weight: 310.1218464702 Daltons
Standard Gibbs Free Energy of Change Formation (ΔfG'° in kcal/mol): 295.5657 [Latendresse13]
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