Anion Radicals of Bacteriochlorophylls c, d, and e. Likely Electron Acceptors in the Primary Photochemistry of Green and Brown Photosynthetic Bacteria

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Representative redox, optical, ESR and ENDOR data and molecular orbital calculations are reported for the anion radicals of the homologous bacteriochlorophylls and bacteriopheophorbides c, d, and e. The chromophores (Chlorobium chlorophylls) have previously been identified or are suspected to exist in the reaction centers of green (c and d) and brown (e) photosynthetic bacteria which appear to straddle green plants and purple bacteria on an evolutionary scale. An early role in the light-driven electron-transport chain of these bacteria is proposed for the Chlorobium chlorophylls. Diagnostic optical and electron paramagnetic spectral signatures are presented for the anion radicals which distinguish them from subsequent acceptors and would identify them in vivo. © 1983, American Chemical Society. All rights reserved.

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Journal of the American Chemical Society

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