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Comparative study of the energy transfer kinetics in artificial BChl e aggregates containing a BChl a acceptor and BChl e-containing chlorosomes of Chlorobium phaeobacteroides
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
2006 (English)In: Journal of Physical Chemistry B, ISSN 1520-6106, Vol. 110, no 3, 1388-1393 p.Article in journal (Refereed) Published
Abstract [en]

Chlorosomes are the light-harvesting organelles of green bacteria, containing mainly special bacteriochlorophylls (BChls) carrying a 3(1)-hydroxy side chain. Artificial aggregates of BChl c, d, and e have been shown to resemble the native chlorosomes in many respects. They are therefore seen as good model systems for understanding the spectroscopic properties of these antenna systems. We have investigated the excitation energy transfer in artificial aggregates of BChl e, containing small amounts of BChl a as an energy acceptor, using steady-state and time-resolved fluorescence. Global analysis of the kinetic data yields two lifetimes attributable to energy transfer: a fast one of 12-20 ps and a slower one of approximately 50 ps. For comparison, BChl e-containing native chlorosomes of Chlorobium phaeobacteroides and chlorosomes in which the energy acceptor had been degraded by alkaline treatment were also studied. A similar behavior is seen in both the artificial and the natural systems. The results suggest that the artificial aggregates of BChls have a potential as antenna systems in future artificial photonic devices.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2006. Vol. 110, no 3, 1388-1393 p.
Keyword [en]
Bacteriochlorophyll A/*chemistry/radiation effects, Bacteriochlorophylls/*chemistry/radiation effects, Chlorobium/*chemistry, Energy Transfer/radiation effects, Kinetics, Lasers, Light, Organelles/*chemistry, Time Factors
National Category
Chemical Sciences
URN: urn:nbn:se:umu:diva-12342DOI: 10.1021/jp053467aPubMedID: 16471689OAI: diva2:152013
Available from: 2008-04-10 Created: 2008-04-10 Last updated: 2013-02-04Bibliographically approved

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Zietz, BurkhardGillbro, Tomas
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