Mixed Upper Exciton State of the Special Pair in Bacterial Reaction Centers

Khmelnitskiy, Anton; Reinot, Tonu; Jankowiak, Ryszard

doi:10.1021/acs.jpcb.8b12542

Title: Mixed Upper Exciton State of the Special Pair in Bacterial Reaction Centers

Journal Article · 09 January 2019 · Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry

DOI: https://doi.org/10.1021/acs.jpcb.8b12542 · OSTI ID:1610886

^[1]; Reinot, Tonu ^[2];

^[2]

Kansas State University, Manhattan, KS (United States); Kansas State University
Kansas State University, Manhattan, KS (United States)

Excitonic interactions between two closely separated bacteriochlorophyll a molecules (BChls) in the special pair of the reaction center (RC) of purple bacteria determine the positions and relative oscillator strengths of its two excitonic components. While the absorption of the lower excitonic band is well defined, the position and the intensity of the upper excitonic band (P_Y+) are still under debate. Recent 77 K two-dimensional electronic spectroscopy data on Rba. capsulatus suggested that the P_Y+ component absorbs at ~840 nm i.e. at a significantly lower energy than previously suggested. In the present work we argue that the P_Y+ state is mixed with the excited states of the accessory BChls (B*/P_Y+) leading to excitons contributing to the 785-825 nm spectral region which is consistent with previously published data. Our conclusion is based on hole-burning/linear dichroism data and modeling studies of the excitonic structure of the RC using non-Markovian reduced density matrix approach.

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Research Organization:: Kansas State University, Manhattan, KS (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division

Grant/Contract Number:: SC0006678

OSTI ID:: 1610886

Journal Information:: Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry, Journal Name: Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry Journal Issue: 4 Vol. 123; ISSN 1520-6106

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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