scholarly journals Shedding Light on Primary Donors in Photosynthetic Reaction Centers

2021 ◽  
Vol 12 ◽  
Author(s):  
Michael Gorka ◽  
Amgalanbaatar Baldansuren ◽  
Amanda Malnati ◽  
Elijah Gruszecki ◽  
John H. Golbeck ◽  
...  

Chlorophylls (Chl)s exist in a variety of flavors and are ubiquitous in both the energy and electron transfer processes of photosynthesis. The functions they perform often occur on the ultrafast (fs–ns) time scale and until recently, these have been difficult to measure in real time. Further, the complexity of the binding pockets and the resulting protein-matrix effects that alter the respective electronic properties have rendered theoretical modeling of these states difficult. Recent advances in experimental methodology, computational modeling, and emergence of new reaction center (RC) structures have renewed interest in these processes and allowed researchers to elucidate previously ambiguous functions of Chls and related pheophytins. This is complemented by a wealth of experimental data obtained from decades of prior research. Studying the electronic properties of Chl molecules has advanced our understanding of both the nature of the primary charge separation and subsequent electron transfer processes of RCs. In this review, we examine the structures of primary electron donors in Type I and Type II RCs in relation to the vast body of spectroscopic research that has been performed on them to date. Further, we present density functional theory calculations on each oxidized primary donor to study both their electronic properties and our ability to model experimental spectroscopic data. This allows us to directly compare the electronic properties of hetero- and homodimeric RCs.

2000 ◽  
Vol 2 (9) ◽  
pp. 1889-1897 ◽  
Author(s):  
Michael Seischab ◽  
Thomas Lodenkemper ◽  
Andre´ Stockmann ◽  
Siegfried Schneider ◽  
Mattijs Koeberg ◽  
...  

1968 ◽  
Vol 9 (3) ◽  
pp. 967-969
Author(s):  
A. B. Rubin ◽  
P. S. Venediktov ◽  
A. A. Kononenko ◽  
L. B. Rubin ◽  
K. N. Timofeev

2012 ◽  
Vol 11 (06) ◽  
pp. 1341-1356 ◽  
Author(s):  
YINXI YU ◽  
HAOBIN WANG ◽  
SHAOWEI CHEN

The constrained density functional theory (CDFT) was used to study bridge-mediated electron transfer processes in mixed-valence systems with two identical metallocene (cobaltocene, ruthenocene, and nickelocene) moieties linked by various bridge structures. Based on the electronic coupling matrix elements obtained from the CDFT calculations, the relationship between the bridge linkage and the effectiveness of intervalence transfer was discussed.


RSC Advances ◽  
2021 ◽  
Vol 11 (35) ◽  
pp. 21359-21366
Author(s):  
Debabrata Chatterjee ◽  
Marta Chrzanowska ◽  
Anna Katafias ◽  
Maria Oszajca ◽  
Rudi van Eldik

[RuII(edta)(L)]2–, where edta4– =ethylenediaminetetraacetate; L = pyrazine (pz) and H2O, can reduce molecular oxygen sequentially to hydrogen peroxide and further to water by involving both outer-sphere and inner-sphere electron transfer processes.


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