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Chlorins programmed for self-assembly
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DOI：10.1007/b137480.png)
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Abstract
En 中文
The supramolecular chemistry of chlorins which are the most abundant photosynthetic pigments is reviewed. In chlorophyll-protein complexes, ligation of the central magnesium atom can occur in two diastereomeric configurations. Light-harvesting complexes of purple bacteria are formed by the self-assembly of short polypeptides which bind bacteriochlorophylls into circular structures. The light-harvesting organelle of green photosynthetic bacteria, the so-called chlorosome, is the most efficient natural antenna system and is formed by self-assembly of bacteriochlorophylls c, d or e without the help of a protein scaffold. Semisynthetic and fully synthetic mimics of these self-assembling bacteriochlorophylls have been prepared and their self-assemblies have been studied in detail in view of artificial light-harvesting systems. From a single crystal X-ray diffraction analysis, one could put into evidence hierarchic supramolecular interactions within such self-assembling systems. Interestingly, hydrogen bonding which all present models of bacterio chlorophyll self-assemblies contain as one of the important supramolecular interactions is absent in the fully synthetic mimics.
Keywords:
self-assembly
chlorophyll
bacteriochlorophyll
antenna complex
chlorosome
biomimetic models
porphyrinoids
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