Abstract
Exciton calculations on tubular pigment aggregates similar to recently proposed models for BChl c/d/e antennae in light-harvesting chlorosomes from green photosynthetic bacteria yield electronic absorption spectra that are super-impositions of linear J-aggregate spectra. While the electronic spectroscopy of such antennae differs considerably from that of linear J-aggregates, tubular exciton models (which may be viewed as cross-coupled J-aggregates) may be constructed to yield spectra that resemble that of the BChl c antenna in the green bacterium Chloroflexus aurantiacus. Highly symmetric tubular models yield absorption spectra with dipole strength distributions essentially identical to that of a J-aggregate; strong symmetry-breaking is needed to simulate the absorption spectrum of the BChl c antenna.
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Abbreviations
- BChl:
-
bacteriochlorophyll
- [E,M] BChl c S :
-
bacteriochlorophyll c with ethyl and methyl substituents in the 8- and 12-positions, and with stearol as the esterifying alcohol
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Buck, D.R., Struve, W.S. Tubular exciton models for BChl c antennae in chlorosomes from green photosynthetic bacteria. Photosynth Res 48, 367–377 (1996). https://doi.org/10.1007/BF00029469
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DOI: https://doi.org/10.1007/BF00029469