Electron Transfer Reactions in Bacterial Photosynthesis: Charge Recombination Kinetics as a Structure Probe

1987 ◽  
pp. 399-421 ◽  
Author(s):  
G. Feher ◽  
M. Okamura ◽  
D. Kleinfeld
Keyword(s):  
Electron Transfer ◽  
Bacterial Photosynthesis ◽  
Charge Recombination ◽  
Transfer Reactions ◽  
Electron Transfer Reactions ◽  
Recombination Kinetics

scholarly journals Concerted proton-electron transfer reactions in the Marcus inverted region

Science ◽  
2019 ◽  
Vol 364 (6439) ◽  
pp. 471-475 ◽  
Author(s):  
Giovanny A. Parada ◽  
Zachary K. Goldsmith ◽  
Scott Kolmar ◽  
Belinda Pettersson Rimgard ◽  
Brandon Q. Mercado ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Rate Constants ◽  
Charge Recombination ◽  
Transfer Reactions ◽  
Inverted Region ◽  
Electron Transfer Reactions ◽  
Proton Coupled Electron Transfer ◽  
Marcus Inverted Region ◽  
A Charge ◽  
Theory Yield

Electron transfer reactions slow down when they become very thermodynamically favorable, a counterintuitive interplay of kinetics and thermodynamics termed the inverted region in Marcus theory. Here we report inverted region behavior for proton-coupled electron transfer (PCET). Photochemical studies of anthracene-phenol-pyridine triads give rate constants for PCET charge recombination that are slower for the more thermodynamically favorable reactions. Photoexcitation forms an anthracene excited state that undergoes PCET to create a charge-separated state. The rate constants for return charge recombination show an inverted dependence on the driving force upon changing pyridine substituents and the solvent. Calculations using vibronically nonadiabatic PCET theory yield rate constants for simultaneous tunneling of the electron and proton that account for the results.

Structure dependence of intramolecular electron transfer reactions of simple dyads of a zinc(ii) porphyrin complex bearing a peripheral bipyridine moiety

2017 ◽  
Vol 46 (37) ◽  
pp. 12645-12654 ◽  
Author(s):  
Kei Sakakibara ◽  
Shou Nagino ◽  
Hajime Akanuma ◽  
Yuki Tsukada ◽  
Hirofumi Nakano ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Charge Recombination ◽  
Transfer Reactions ◽  
Intramolecular Electron Transfer ◽  
Structure Dependence ◽  
Electron Transfer Reactions ◽  
Porphyrin Complex ◽  
Recombination Reactions

Photoinduced intramolecular electron transfer and charge recombination reactions were investigated using various Zn(ii)-porphyrin dyads having a 2,2′-bipyridine moiety.

Intramolecular electron transfer reactions in meso-(4-nitrophenyl)-substituted subporphyrins

2016 ◽  
Vol 52 (7) ◽  
pp. 1424-1427 ◽  
Author(s):  
Graeme Copley ◽  
Juwon Oh ◽  
Kota Yoshida ◽  
Daiki Shimizu ◽  
Dongho Kim ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Absorption Spectroscopy ◽  
Charge Separation ◽  
Transient Absorption ◽  
Charge Recombination ◽  
Transient Absorption Spectroscopy ◽  
Transfer Reactions ◽  
Intramolecular Electron Transfer ◽  
Time Resolved ◽  
Electron Transfer Reactions

A2B-type meso-(4-nitrophenyl)-substituted subporphyrins have been synthesized and shown to undergo very fast photoinduced intramolecular charge separation (CS) and charge recombination (CR) between the subporphyrin core and the meso-4-nitrophenyl group in CH2Cl2 as probed by femtosecond time-resolved transient absorption spectroscopy.

Electron-transfer reactions in the Marcus inverted region. Charge recombination versus charge shift reactions

1989 ◽  
Vol 111 (5) ◽  
pp. 1917-1919 ◽  
Author(s):  
Ian R. Gould ◽  
Jacques E. Moser ◽  
Bruce Armitage ◽  
Samir Farid ◽  
Joshua L. Goodman ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Charge Recombination ◽  
Transfer Reactions ◽  
Inverted Region ◽  
Electron Transfer Reactions ◽  
Marcus Inverted Region ◽  
Charge Shift
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