Tetrapirrol
Tetrapirrolak pirrol edo pirrol motako lau eraztun dituzten konposatu kimikoen klasea dira. Pirrol-eraztunak metino- (=CH−) edo metileno-( −CH2−) unitateen bidez lotzen dira, modu lineal edo zikliko batean[1].
Tetrapirrol batzuek sistema bizietan rol biokimiko erabakigarriak dituzten konposatuen nukleo aktiboa osatzen dute, hemoglobina eta klorofila kasu. Bi molekula horietan, zehazki, pirrolaren makrozikloak atomo metaliko bat biltzen du, pirrolekin koordinazio-konposatu bat eratzen duena eta molekula horien funtzio biokimikoan zeregin nagusia duena.
Molekulen tetrapirrol-zatiek kromoforo gisa jokatu ohi dute, horietan konjugazio-maila handia dagoelako. Beraz, konposatu horiek normalean kolorea izaten dute..
Egitura
Linealak
Tetrapirrol linealen artean biliberdina, bilirrubina, fikobilinak eta luziferinak aipa daitezke.
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|
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|---|---|---|
| Bilirrubina | Biliberdina | Fikooeritrobilina |
Ziklikoak
Tetrapirrol ziklikoen artean porfirina eta bere deribatuak eta klorinak nabarmen daitezke.
|
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|---|---|
| Porfirina | Klorina |
Erreferentziak
- ↑ Eicher, Theophil; Hauptmann, Siegfried; Speicher, Andreas. (2012). The chemistry of heterocycles: structure, reactions, syntheses, and applications. (3rd, completely rev. and updated ed. argitaraldia) Wiley-VCH ISBN 978-3-527-32868-0. (kontsulta data: 2026-05-10).
Datuak: Q422399
Multimedia: Tetrapyrroles / Q422399
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