Molecular formula C
20H 16N 4
Molar mass 312.36784
Except where noted otherwise, data are given for materials in their
standard state (at 25 °C (77 °F), 100 kPa)
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organic chemistry, a chlorin is a large heterocyclic aromatic ring consisting, at the core, of three pyrroles and one pyrroline coupled through four = linkages. Unlike CH- porphin, the central aromatic ring structure of porphyrins, a chlorin is therefore largely aromatic but not aromatic through the entire circumference of the ring.
Magnesium-containing chlorins are called
chlorophylls, and are the central photosensitive pigment in chloroplasts.
Related compounds, with two
pyrroles and two pyrrolines (which are like pyrroles with one double bond reduced to a single bond) in the macrocycle are called and bacteriochlorins . isobacteriochlorins [1 ]
, chlorin, bacteriochlorin, and isobacteriochlorin. Note relocation of C=C
between the two bacteriochlorin
. There are two
(symbolized by π e
) for every double bond in the
Because of their photosensitivity, chlorins are in active use as photosensitizing agents in experimental
See also [ edit ]
References [ edit ]
^ "ChEBI". June 16, 2009. pp. isobacteriochlorin (CHEBI:52583) . Retrieved 1 February 2012.
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