Ionization, charge separation, charge recombination, and electron transfer in large systems

1992 ◽  
Vol 96 (26) ◽  
pp. 10608-10616 ◽  
Author(s):  
E. W. Schlag ◽  
R. D. Levine
Keyword(s):  
Electron Transfer ◽  
Charge Separation ◽  
Charge Recombination ◽  
Large Systems

scholarly journals How can infra-red excitation both accelerate and slow charge transfer in the same molecule?

2018 ◽  
Vol 9 (30) ◽  
pp. 6395-6405 ◽  
Author(s):  
Zheng Ma ◽  
Zhiwei Lin ◽  
Candace M. Lawrence ◽  
Igor V. Rubtsov ◽  
Panayiotis Antoniou ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Charge Transfer ◽  
Charge Separation ◽  
Charge Recombination ◽  
Recombination Rates ◽  
Infra Red ◽  
Induced Changes

A UV-IR-Vis 3-pulse study of infra-red induced changes to electron transfer (ET) rates in a donor–bridge–acceptor species finds that charge-separation rates are slowed, while charge-recombination rates are accelerated as a result of IR excitation during the reaction.

Photoinduced electron transfer in 5-bromouracil labeled DNA. A contrathermodynamic mechanism revisited by electron transfer theories

2019 ◽  
Vol 21 (8) ◽  
pp. 4387-4393 ◽  
Author(s):  
Lorenzo Cupellini ◽  
Paweł Wityk ◽  
Benedetta Mennucci ◽  
Janusz Rak
Keyword(s):  
Electron Transfer ◽  
Charge Separation ◽  
Photoinduced Electron Transfer ◽  
Charge Recombination ◽  
Photoinduced Charge Separation ◽  
Photoinduced Charge

Neither the rates of photoinduced charge separation nor charge recombination account for the substantial damage observed in the 5′-ABrU sequence.

Molecular-structure control of electron transfer dynamics of push–pull porphyrins as sensitizers for NiO based dye sensitized solar cells

RSC Advances ◽  
2016 ◽  
Vol 6 (81) ◽  
pp. 77184-77194 ◽  
Author(s):  
Lei Zhang ◽  
Ludovic Favereau ◽  
Yoann Farre ◽  
Antoine Maufroy ◽  
Yann Pellegrin ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Electron Transfer ◽  
Solar Cells ◽  
Charge Separation ◽  
Photovoltaic Performance ◽  
Dye Sensitized Solar Cells ◽  
Charge Recombination ◽  
Structure Control ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Zn(ii)-porphyrin dyes for NiO dye-sensitized solar cells showed surprisingly rapid charge recombination, in spite of their push–pull character. Appending a secondary acceptor prolonged charge separation and led to improved photovoltaic performance.

Increasing the Yield of Photoinduced Charge Separation through Parallel Electron Transfer Pathways

1999 ◽  
Vol 03 (01) ◽  
pp. 32-44 ◽  
Author(s):  
NYANGENYA I. MANIGA ◽  
JOHN P. SUMIDA ◽  
SIMON STONE ◽  
ANA L. MOORE ◽  
THOMAS A. MOORE ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Quantum Yield ◽  
Charge Separation ◽  
Charge Recombination ◽  
Final State ◽  
Photoinduced Charge Separation ◽  
Electron Transfer Pathways ◽  
Artificial Photosynthetic ◽  
A Charge ◽  
Photoinduced Charge

A strategy for increasing the yield of long-lived photoinduced charge separation in artificial photosynthetic reaction centers which is based on multiple electron transfer pathways operating in parallel has been investigated. Excitation of the porphyrin moiety of a carotenoid ( C )–porphyrin ( P )–naphthoquinone (Q) molecular triad leads to the formation of a charge-separated state C ·+– P – Q ·− with an overall quantum yield of 0.044 in benzonitrile solution. Photoinduced electron transfer from the porphyrin first excited singlet state gives C – P ·+– Q ·− with a quantum yield of ~1.0. However, electron transfer from the carotenoid to the porphyrin radical cation to form the final state does not compete well with charge recombination of C – P ·+– Q ·−, reducing the yield. The related pentad C 3– P – Q features carotenoid, porphyrin and quinone moieties closely related to those in the triad. Excitation of this molecule gives a C ·+– P ( C 2)– Q ·− state with a quantum yield of 0.073. The enhanced yield is ascribed to the fact that three electron donation pathways operating in parallel compete with charge recombination. The yield does not increase by the statistically predicted factor of three owing to small differences in thermodynamic driving force between the two compounds.

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.

Corrole–ferrocene and corrole–anthraquinone dyads: synthesis, spectroscopy and photochemistry

2015 ◽  
Vol 17 (40) ◽  
pp. 26607-26620 ◽  
Author(s):  
Jaipal Kandhadi ◽  
Venkatesh Yeduru ◽  
Prakriti R. Bangal ◽  
Lingamallu Giribabu
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Charge Separation ◽  
Photoinduced Electron Transfer ◽  
Charge Recombination ◽  
Transfer Rates ◽  
Donor Acceptor

Two different donor–acceptor systems based on corrole–ferrocene (Cor–Fc) and corrole–anthraquinone (Cor–AQ) have been designed and synthesized. Excited state properties of these dyads indicates intramolecular photoinduced electron transfer (PET) take place in these dyads and the electron-transfer rates (kET) was found to be ∼1011s−1. The charge separation (CS) and charge recombination (CR) are found to be identical.

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