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Zeitschrift für Physikalische Chemie

International journal of research in physical chemistry and chemical physics

Editor-in-Chief: Rademann, Klaus

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Volume 231, Issue 3


Triplet Charge Recombination in Heliobacterial Reaction Centers Does Not Produce a Spin-Polarized EPR Spectrum

Bryan Ferlez
  • Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16802, United States of America
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Alessandro Agostini / Donatella Carbonera / John H. Golbeck
  • Department of Biochemistry and Molecular Biology and Department of Chemistry, The Pennsylvania State University, University Park, PA 16802, United States of America
  • Freiburg Institute of Advanced Studies (FRIAS), Albert-Ludwigs-Universität Freiburg, Albertstr.19, 79104 Freiburg, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Art van der Est
  • Corresponding author
  • Freiburg Institute of Advanced Studies (FRIAS), Albert-Ludwigs-Universität Freiburg, Albertstr.19, 79104 Freiburg, Germany
  • Departments of Chemistry and Physics, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON, Canada L2S 3A1
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Published Online: 2016-10-08 | DOI: https://doi.org/10.1515/zpch-2016-0825


In photosynthetic reaction centers, reduction of the secondary acceptors leads to triplet charge recombination of the primary radical pair (RP). This process is spin selective and in a magnetic field it populates only the T0 state of the donor triplet state. As a result, the triplet state of the donor has a distinctive spin polarization pattern that can be measured by transient electron paramagnetic resonance (TREPR) spectroscopy. In heliobacterial reaction centers (HbRCs), the primary donor, P800, is composed of two bacteriochlorophyll g′ molecules and its triplet state has not been studied as extensively as those of other reaction centers. Here, we present TREPR and optically detected magnetic resonance (ODMR) data of 3P800 and show that although it can be detected by ODMR it is not observed in the TREPR data. We demonstrate that the absence of the TREPR spectrum is a result of the fact that the zero-field splitting (ZFS) tensor of 3P800 is maximally rhombic, which results in complete cancelation of the absorptive and emissive polarization in randomly oriented samples.

Keywords: chlorophyll a; P800 bacteriochlorophyll g; photosynthesis; type I reaction center

Dedicated to: Kev Salikhov on the occasion of his 80th birthday.


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About the article

Received: 2016-06-13

Accepted: 2016-09-13

Published Online: 2016-10-08

Published in Print: 2017-03-01

Citation Information: Zeitschrift für Physikalische Chemie, Volume 231, Issue 3, Pages 593–607, ISSN (Online) 2196-7156, ISSN (Print) 0942-9352, DOI: https://doi.org/10.1515/zpch-2016-0825.

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