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Encyclopedia > Tetrapyrrole

A Polypyrrole (PPy) is a chemical compound formed from a number of connected pyrrole ring structures. For example a tetrapyrrole is a compound with four pyrrole rings connected. Polypyrroles are conducting polymers of the rigid-rod polymer host family. Pyrrole, or pyrrol, is a heterocyclic aromatic organic compound, a five-membered ring with the formula C4H5N. Pyrroles are components of larger aromatic rings, including the porphyrins of heme, the chlorins and bacteriochlorins of chlorophyll, and the corrin ring of vitamin B12. ... Almost all organic polymers are electrical insulators. ...

Polypyrroles are also called pyrrole blacks or polypyrrole blacks.

  Results from FactBites:
Photochemistry and Photobiology: Chloroplast biogenesis 87: Evidence of resonance excitation energy transfer between ... (1278 words)
Occurrence of resonance excitation energy transfer between tetrapyrrole donors and Chl a acceptors was evidenced by definite excitation maxima that corresponded to absorbance maxima of the various tetrapyrrole donors.
The detection of resonance excitation energy transfer between anabolic tetrapyrroles and various Chl a-protein complexes may be blurred by the occurrence of endogenous resonance excitation energy transfers that occur in all healthy thylakoids.
Because the in situ excitation spectrum of a given tetrapyrrole was recorded at the emission maximum of that tetrapyrrole, the most pronounced excitation maximum in the excitation profile corresponded to that particular tetrapyrrole.
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