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Title: Excitation Energy Transfer in the Peridinin-Chlorophyll a-Protein Complex Modeled Using Configuration Interaction

Journal Article · · Journal of Physical Chemistry. B
DOI:https://doi.org/10.1021/jp5017054· OSTI ID:1136979
 [1];  [1]
  1. Department of Energy, Environmental and Chemical Engineering, Washington University, Saint Louis, Missouri 63130, United States

We modeled excitation energy transfer (EET) in the peridinin-chlorophyll a-protein (PCP) complex of dinoflagellate Amphidinium carterae to determine which pathways contribute dominantly to the high efficiency of this process. We used complete active space configuration interaction (CAS-CI) to calculate electronic structure properties of the peridinin (PID) and chlorophyll a (CLA) pigments in PCP and the transition density cube (TDC) method to calculate Coulombic couplings between energy transfer donors and acceptors. Our calculations show that the S1 → Qy EET pathway from peridinin to chlorophyll a is the dominant energy transfer pathway in PCP, with two sets of interactions—between PID612 and CLA601 and between PID622 and CLA602—contributing most strongly. EET lifetimes for these two interactions were calculated to be 2.66 and 2.90, with quantum efficiencies of 85.75 and 84.65%, respectively. The calculated Coulombic couplings for EET between two peridinin molecules in the strongly allowed S2 excited states are extremely large and suggest excitonic coupling between pairs of peridinin S2 states. This methodology is also broadly applicable to the study of EET in other photosynthetic complexes and/or organic photovoltaics, where both single and double excitations are present and donor and acceptor molecules are tightly packed.

Research Organization:
Washington Univ., St. Louis, MO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
DOE Contract Number:
SC0001035
OSTI ID:
1136979
Report Number(s):
DE-SC0001035-118
Journal Information:
Journal of Physical Chemistry. B, Vol. 118, Issue 31; ISSN 1520-6106
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English

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