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Issue 31, 2014
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Energy transfer in aggregates of bacteriochlorophyll c self-assembled with azulene derivatives

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Abstract

Bacteriochlorophyll (BChl) c is the main light-harvesting pigment of certain photosynthetic bacteria. It is found in the form of self-assembled aggregates in the so-called chlorosomes. Here we report the results of co-aggregation experiments of BChl c with azulene and its tailored derivatives. We have performed spectroscopic and quantum chemical characterization of the azulenes, followed by self-assembly experiments. The results show that only azulenes with sufficient hydrophobicity are able to induce aggregation of BChl c. Interestingly, only azulene derivatives possessing a conjugated phenyl ring were capable of efficient (∼50%) excitation energy transfer to BChl molecules. These aggregates represent an artificial light-harvesting complex with enhanced absorption between 220 and 350 nm compared to aggregates of pure BChl c. The results provide insight into the principles of self-assembly of BChl aggregates and suggest an important role of the π–π interactions in efficient energy transfer.

Graphical abstract: Energy transfer in aggregates of bacteriochlorophyll c self-assembled with azulene derivatives

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Publication details

The article was received on 26 Mar 2014, accepted on 23 Jun 2014 and first published on 23 Jun 2014


Article type: Paper
DOI: 10.1039/C4CP01311E
Citation: Phys. Chem. Chem. Phys., 2014,16, 16755-16764
  • Open access: Creative Commons BY-NC license
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    Energy transfer in aggregates of bacteriochlorophyll c self-assembled with azulene derivatives

    M. Matěnová, V. Lorelei Horhoiu, F. Dang, P. Pospíšil, J. Alster, J. V. Burda, T. Silviu Balaban and J. Pšenčík, Phys. Chem. Chem. Phys., 2014, 16, 16755
    DOI: 10.1039/C4CP01311E

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