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

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.

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

Physical Chemistry Chemical Physics ◽

10.1039/c8cp07700b ◽

2019 ◽

Vol 21 (8) ◽

pp. 4387-4393 ◽

Cited By ~ 3

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.

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ChemInform Abstract: Photoinduced Charge Separation in Rigid Bichromophoric Compounds and Charge Transfer State Electron Transfer Reactivity.

ChemInform ◽

10.1002/chin.199605029 ◽

2010 ◽

Vol 27 (5) ◽

pp. no-no

Author(s):

J. L. HABIB JIWAN ◽

J. PH. SOUMILLION

Keyword(s):

Electron Transfer ◽

Charge Transfer ◽

Charge Separation ◽

Charge Transfer State ◽

State Electron ◽

Photoinduced Charge Separation ◽

Photoinduced Charge ◽

Transfer State

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Temperature Effects on the Energy Gap Dependence of Charge Recombination Rates of Ion Pairs Produced by Excitation of Charge-Transfer Complexes Adsorbed on Porous Glass

The Journal of Physical Chemistry B ◽

10.1021/jp971705z ◽

1997 ◽

Vol 101 (40) ◽

pp. 7978-7984 ◽

Cited By ~ 14

Author(s):

Hiroshi Miyasaka ◽

Shoji Kotani ◽

Akira Itaya ◽

Gerd Schweitzer ◽

Frans C. De Schryver ◽

...

Keyword(s):

Charge Transfer ◽

Porous Glass ◽

Temperature Effects ◽

Energy Gap ◽

Ion Pairs ◽

Charge Recombination ◽

Charge Transfer Complexes ◽

Recombination Rates

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

RSC Advances ◽

10.1039/c6ra15195g ◽

2016 ◽

Vol 6 (81) ◽

pp. 77184-77194 ◽

Cited By ~ 19

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.

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Charge separation, charge recombination and electron transfer reactions in solutions of fullerene-C60 and phenothiazines

Chemical Physics Letters ◽

10.1016/s0009-2614(96)01456-x ◽

1997 ◽

Vol 265 (3-5) ◽

pp. 365-373 ◽

Cited By ~ 14

Author(s):

H.N. Ghosh ◽

D.K. Palit ◽

A.V. Sapre ◽

J.P. Mittal

Keyword(s):

Electron Transfer ◽

Charge Separation ◽

Charge Recombination ◽

Fullerene C60 ◽

Transfer Reactions ◽

Electron Transfer Reactions

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Photoinduced Charge Separation in Rigid Bichromophoric Compounds and Charge Transfer State Electron Transfer Reactivity

The Journal of Physical Chemistry ◽

10.1021/j100039a007 ◽

1995 ◽

Vol 99 (39) ◽

pp. 14223-14230 ◽

Cited By ~ 9

Author(s):

J. L. Habib Jiwan ◽

J. Ph. Soumillion

Keyword(s):

Electron Transfer ◽

Charge Transfer ◽

Charge Separation ◽

Charge Transfer State ◽

State Electron ◽

Photoinduced Charge Separation ◽

Photoinduced Charge ◽

Transfer State

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Solvent Dependence of Charge Separation and Charge Recombination Rates in Porphyrin−Fullerene Dyad

The Journal of Physical Chemistry A ◽

10.1021/jp002158b ◽

2001 ◽

Vol 105 (2) ◽

pp. 325-332 ◽

Cited By ~ 137

Author(s):

Hiroshi Imahori ◽

Mohamed E. El-Khouly ◽

Mamoru Fujitsuka ◽

Osamu Ito ◽

Yoshiteru Sakata ◽

...

Keyword(s):

Charge Separation ◽

Charge Recombination ◽

Recombination Rates ◽

Solvent Dependence

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

The Journal of Physical Chemistry ◽

10.1021/j100205a010 ◽

1992 ◽

Vol 96 (26) ◽

pp. 10608-10616 ◽

Cited By ~ 56

Author(s):

E. W. Schlag ◽

R. D. Levine

Keyword(s):

Electron Transfer ◽

Charge Separation ◽

Charge Recombination ◽

Large Systems

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

Journal of Porphyrins and Phthalocyanines ◽

10.1002/(sici)1099-1409(199901)3:1<32::aid-jpp99>3.0.co;2-8 ◽

1999 ◽

Vol 03 (01) ◽

pp. 32-44 ◽

Cited By ~ 6

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.

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