Chlorin

 In organic chemistry, a chlorin is a tetrapyrrole pigment, simply these are partially hydrogenated porphyrins.^[1] The parent chlorin is an unstable compound which undergoes air oxidation to porphine.

Chlorin

Names
Other names 2,3-Dihydroporphine
Identifiers
CAS Number	2683-84-3
3D model (JSmol)	Interactive image
ChEBI	CHEBI:36303
ChemSpider	58616
PubChem CID	65106
CompTox Dashboard (EPA)	DTXSID30893669
InChI InChI=1S/C20H16N4/c1-2-14-10-16-5-6-18(23-16)12-20-8-7-19(24-20)11-17-4-3-15(22-17)9-13(1)21-14/h1-6,9-12,22-23H,7-8H2/b13-9-,14-10-,15-9-,16-10-,17-11-,18-12-,19-11-,20-12-  Key: UGADAJMDJZPKQX-CEVVSZFKSA-N  InChI=1/C20H16N4/c1-2-14-10-16-5-6-18(23-16)12-20-8-7-19(24-20)11-17-4-3-15(22-17)9-13(1)21-14/h1-6,9-12,22-23H,7-8H2/b13-9-,14-10-,15-9-,16-10-,17-11-,18-12-,19-11-,20-12- Key: UGADAJMDJZPKQX-CEVVSZFKBJ
SMILES C(N1)(/C=C2N=C(C=C\2)/C=C3N/C(C=C\3)=C\4)=CC=C1/C=C5CCC4=N/5
Properties
Chemical formula	C20H16N4
Molar mass	312.36784
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

The name chlorin derived from chlorophylls. Chlorophylls are Magnesium containing chlorins, a photosynthetic pigment present in chloroplasts. The reduced chlorin variants are present in bacteriochlorophylls and they are named as bacteriochlorins and isobacteriochlorins.

Structures comparing porphin, chlorin, bacteriochlorin, and isobacteriochlorin.

Chlorins are excellent photosensitizing agents. Various synthetic chlorins analogues such as m-tetrahydroxyphenylchlorin (mTHPC) and mono-L-aspartyl chlorin e6 are effectively employed in experimental photodynamic therapy as photosensitizer.^[2]

Natural ChlorinsEdit

ChlorophyllEdit

The most abundant chlorin is Photosynthetic pigment Chlorophyll. There are different types of chlorophylls, such as Chlorophyll a, Chlorophyll b, Chlorophyll d, Chlorophyll e, Chlorophyll f, Chlorophyll g. The basic unit of these chlorophylls is a chlorin with Magnesium as a central metal atom. ^[3]

This article uses material from the Wikipedia article  Metasyntactic variable, which is released under the  Creative Commons Attribution-ShareAlike 3.0 Unported License.