Porphine
Porphine or porphin is an organic compound of empirical formula Template:Chem2. It is heterocyclic and aromatic. The molecule is a flat macrocycle, consisting of four pyrrole-like rings joined by four methine bridges, which makes it the simplest of the tetrapyrroles.[1]
The nonpolar tetrapyrrolic ring structure of porphine means it is poorly soluble in most organic solvents and hardly water soluble.[2] As a result, porphine is mostly of theoretical interest. It has been detected in GC-MS of certain fractions of Piper betle.[3]
Porphine derivatives: porphyrins
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Substituted derivatives of porphine are called porphyrins. Many porphyrins are found in nature with the dominant example being protoporphyrin IX.[4] Many synthetic porphyrins are also known, including octaethylporphyrin[5] and tetraphenylporphyrin.[6]
- Common porphyrins
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Derivatives of protoporphyrin IX are common in nature, the precursor to hemes.
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Octaethylporphyrin (H2OEP) is a synthetic analogue of protoporphyrin IX. Unlike the natural porphyrin ligands, OEP2− is highly symmetrical.
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Tetraphenylporphyrin (H2TPP)is another synthetic analogue of protoporphyrin IX. Unlike the natural porphyrin ligands, TPP2− is highly symmetrical. Another difference is that its methine centers are occupied by phenyl groups.
Further reading
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References
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