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• W2005012772 abstract "Bacteriochlorophylls (BChls) c , d , and e are the main light-harvesting pigments of green photosynthetic bacteria that self-assemble into nanostructures within the chlorosomes forming the most efficient antennas of photosynthetic organisms. All previous models of the chlorosomal antennae, which are quite controversially discussed because no single crystals could be grown so far from these organelles, involve a strong hydrogen-bonding interaction between the 3 1 hydroxyl group and the 13 1 carbonyl group. We have synthesized different self-assemblies of BChl c mimics having the same functional groups as the natural counterparts, that is, a hydroxyethyl substituent, a carbonyl group and a divalent metal atom ligated by a tetrapyrrole. These artificial BChl mimics have been shown by single crystal x-ray diffraction to form extended stacks that are packed by hydrophobic interactions and in the absence of hydrogen bonding. Time-resolved photoluminescence proves the ordered nature of the self-assembled stacks. FT-IR spectra show that on self-assembly the carbonyl frequency is shifted by ≈30 cm −1 to lower wavenumbers. From the FT-IR data we can infer the proximal interactions between the BChls in the chlorosomes consistent with a single crystal x-ray structure that shows a weak electrostatic interaction between carbonyl groups and the central zinc atom." @default.
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• W2005012772 date "2008-09-02" @default.
• W2005012772 modified "2023-10-18" @default.
• W2005012772 title "The supramolecular organization of self-assembling chlorosomal bacteriochlorophyll <i>c</i> , <i>d</i> , or <i>e</i> mimics" @default.
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• W2005012772 doi "https://doi.org/10.1073/pnas.0802719105" @default.
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