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Chlorins differ by the number of double bonds and their location. Chlorin has 20 pi electrons, whereas bacteriochlorin and isobacterichlorin have 18 pi electrons, but at different locations.

Porphyrin, chlorin, bacteriochlorin

Do chlorin, bacteriochlorin and isobacteriochlorin have distinct biological function due to this double-bond difference?

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I only found a hint that this might be the case in this publication by Singh et al., stating

Porphyrins, chlorins, bacteriochlorins, and isobacteriochlorins each have unique photophysical properties that are exploited by nature and can be used for diverse applications (1, 2).

I don't have access to "The Porphyrin Handbook" (The first citation in the quote above), but I suspect it would be your best guess in finding more information.

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