Porphyrins

Patent Pending Porphyrins 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 porphyrin is porphin, and substituted porphines are called porphyrins. The porphyrin macrocycle has 26 (delocalized) pi electrons in total, therefore by Hückel's rule it is aromatic, possessing 4n+2 π electrons (n=4, for the shortest cyclic path).