Photoinitiated charge separation in a carotenoid-porphyrin-diquinone tetrad: enhanced quantum yields via multistep electron transfers

1988 ◽  
Vol 110 (1) ◽  
pp. 321-323 ◽  
Author(s):  
Devens. Gust ◽  
Thomas A. Moore ◽  
Ana L. Moore ◽  
Donna. Barrett ◽  
Larry O. Harding ◽  
...  
Keyword(s):  
Charge Separation ◽  
Quantum Yields ◽  
Electron Transfers

ChemInform Abstract: Photoinitiated Charge Separation in a Carotenoid-Porphyrin-Diquinone Tetrad: Enhanced Quantum Yields via Multistep Electron Transfers.

ChemInform ◽  
1988 ◽  
Vol 19 (15) ◽  
Author(s):  
D. GUST ◽  
T. A. MOORE ◽  
A. L. MOORE ◽  
D. BARRETT ◽  
L. O. HARDING ◽  
...  
Keyword(s):  
Charge Separation ◽  
Quantum Yields ◽  
Electron Transfers

Quantum effects in ultrafast electron transfers within cryptochromes

2016 ◽  
Vol 18 (31) ◽  
pp. 21442-21457 ◽  
Author(s):  
Thiago Firmino ◽  
Etienne Mangaud ◽  
Fabien Cailliez ◽  
Adrien Devolder ◽  
David Mendive-Tapia ◽  
...  
Keyword(s):  
Charge Separation ◽  
Electronic Excitation ◽  
Quantum Effects ◽  
Electron Transfers

Cryptochromes and photolyases are flavoproteins that may undergo ultrafast charge separation upon electronic excitation of their flavin cofactors.

Photoinduced charge separation in a carotenoid-porphyrin-diquinone tetrad: enhancement of quantum yields via control of electronic coupling

1993 ◽  
Vol 176 (2-3) ◽  
pp. 321-336 ◽  
Author(s):  
Seung-Joo Lee ◽  
Janice M. DeGraziano ◽  
Alisdair N. Macpherson ◽  
Eun-Ju Shin ◽  
Pamela K. Kerrigan ◽  
...  
Keyword(s):  
Charge Separation ◽  
Quantum Yields ◽  
Electronic Coupling ◽  
Photoinduced Charge Separation ◽  
Photoinduced Charge

Raising the barrier for photoinduced DNA charge injection with a cyclohexyl artificial base pair

2015 ◽  
Vol 185 ◽  
pp. 105-120 ◽  
Author(s):  
Arunoday P. N. Singh ◽  
Michelle A. Harris ◽  
Ryan M. Young ◽  
Stephen A. Miller ◽  
Michael R. Wasielewski ◽  
...  
Keyword(s):  
Base Pair ◽  
Charge Separation ◽  
Charge Recombination ◽  
Hole Injection ◽  
Quantum Yields ◽  
Base Pairs ◽  
Dna Hairpins ◽  
Synthetic Dna ◽  
Photoinduced Charge Separation ◽  
Photoinduced Charge

The effects of an artificial cyclohexyl base pair on the quantum yields of fluorescence and dynamics of charge separation and charge recombination have been investigated for several synthetic DNA hairpins. The hairpins possess stilbenedicarboxamide, perylenediimide, or naphthalenediimide linkers and base-paired stems. In the absence of the artificial base pair hole injection into both adenine and guanine purine bases is exergonic and irreversible, except in the case of stilbene with adenine for which it is slightly endergonic and reversible. Insertion of the artificial base pair renders hole injection endergonic or isoergonic except in the case of the powerful naphthalene acceptor for which it remains exergonic. Both hole injection and charge recombination are slower for the naphthalene acceptor in the presence of the artificial base pair than in its absence. The effect of an artificial base pair on charge separation and charge recombination in hairpins possessing stilbene and naphthalene acceptor linkers and a stilbenediether donor capping group has also been investigated. In the case of the stilbene acceptor–stilbene donor capped hairpins photoinduced charge separation across six base pairs is efficient in the absence of the artificial base pair but does not occur in its presence. In the case of the naphthalene acceptor–stilbene donor capped hairpins the artificial base pair slows but does not stop charge separation and charge recombination, leading to the formation of long-lived charge separated states.

How exciton-vibrational coherences control charge separation in the photosystem II reaction center

2015 ◽  
Vol 17 (46) ◽  
pp. 30828-30841 ◽  
Author(s):  
Vladimir I. Novoderezhkin ◽  
Elisabet Romero ◽  
Rienk van Grondelle
Keyword(s):  
Photosystem Ii ◽  
Reaction Center ◽  
Charge Separation ◽  
Photon Echo ◽  
Energy Electron ◽  
Two Dimensional ◽  
Directed Energy ◽  
Electron Transfers

Two-dimensional photon echo in the photosystem II reaction center reveals the exciton-vibrational coherences that promote directed energy/electron transfers.

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