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What (who) is porphyrin - definition
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![Derivatives of [[protoporphyrin IX]] are common in nature, the precursor to [[heme]]s.](https://commons.wikimedia.org/wiki/Special:FilePath/PPIXtransH.png?width=200 "Derivatives of [[protoporphyrin IX]] are common in nature, the precursor to [[heme]]s.")
![[[Octaethylporphyrin]] (H2OEP) is a synthetic analogue of protoporphyrin IX. Unlike the natural porphyrin ligands, OEP2− is highly symmetrical.](https://commons.wikimedia.org/wiki/Special:FilePath/H2octaethylporphyrin.png ?width=200 "[[Octaethylporphyrin]] (H2OEP) is a synthetic analogue of protoporphyrin IX. Unlike the natural porphyrin ligands, OEP2− is highly symmetrical.")
![[[Tetraphenylporphyrin]] (H2TPP)is another synthetic analogue of protoporphyrin IX. Unlike the natural porphyrin ligands, TPP2− is highly symmetrical. Another difference is that its methyne centers are occupied by phenyl groups.](https://commons.wikimedia.org/wiki/Special:FilePath/H2TPP.png?width=200 "[[Tetraphenylporphyrin]] (H2TPP)is another synthetic analogue of protoporphyrin IX. Unlike the natural porphyrin ligands, TPP2− is highly symmetrical. Another difference is that its methyne centers are occupied by phenyl groups.")
![Simplified view of [[heme]], a complex of a protoporphyrin IX.](https://commons.wikimedia.org/wiki/Special:FilePath/Heme b.svg?width=200 "Simplified view of [[heme]], a complex of a protoporphyrin IX.")
![UV–vis]] readout for ''meso''-tetraphenylporphyrin](https://commons.wikimedia.org/wiki/Special:FilePath/Meso-tetraphenylporphyrin UV-vis.JPG?width=200 "UV–vis]] readout for ''meso''-tetraphenylporphyrin")
Wikipedia
Porphyrins ( POR-fər-in) are a group of heterocyclic macrocycle organic compounds, composed of four modified pyrrole subunits interconnected at their α carbon atoms via methine bridges (=CH−). The parent of porphyrins is porphine, a rare chemical compound of exclusively theoretical interest. Substituted porphines are called porphyrins. With a total of 26 π-electrons, of which 18 π-electrons form a planar, continuous cycle, the porphyrin ring structure is often described as aromatic. One result of the large conjugated system is that porphyrins typically absorb strongly in the visible region of the electromagnetic spectrum, i.e. they are deeply colored. The name "porphyrin" derives from the Greek word πορφύρα (porphyra), meaning purple.
