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Aggregates of three homologs of bacteriochlorophyll c from Chlorobium limicola in water-saturated carbon tetrachloride and in solid films were studied by means of FT-IR. Four keto-carbonyl stretching peaks were observed at 1703, 1682-4, 1649-51, and 1641-3 cm−1 corresponding to free C=O (monomer), free C=O (dimer, tetramer), coordinated C=O (dimer, tetramer), and coordinated C=O (polymer), respectively.
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Uehara et al. (1991) studied this question.
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