Abstract
Using absorption detected magnetic resonance (ADMR) the triplet states of carotenoids have been detected in B880—RC complexes of the purple photosynthetic bacteria Rhodocyclus gelatinosus 149, Rhodopseudomonas acidophila 7050, Rhodopseudomonas palustris 8252, and Rhodospirillum rubrum S1, and in reaction center (RC) complexes of Rhodospirillum rubrum S1. The triplet states were identified as belonging to antenna carotenois in the all-trans conformation with conjugated chain lengths ranging from 10 to 13 double bonds, and to the RC carotenoid 15,15′-cis spirilloxanthin. Carotenoids with different numbers of conjugated double bonds have similar ability to quench the triplet states of the bacteriochlorophylls.
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