scholarly journals Photoinduced electron transfer in a molecular dyad by nanosecond pump–pump–probe spectroscopy

2018 ◽  
Vol 17 (7) ◽  
pp. 903-909 ◽  
Author(s):  
M.-H. Ha-Thi ◽  
V.-T. Pham ◽  
T. Pino ◽  
V. Maslova ◽  
A. Quaranta ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Photoinduced Electron Transfer ◽  
Charge Accumulation ◽  
Pump Probe ◽  
Probe Spectroscopy ◽  
Photoinduced Charge

Photoinduced charge accumulation was investigated in a molecular dyad composed of a porphyrin chromophore and a ruthenium-based catalyst by pump–pump–probe experiments.

Ultrafast Energy And Electron Transfer In Conjugated Oligomer-Fullerene Molecules

2001 ◽  
Vol 665 ◽  
Author(s):  
P.A. van Hal ◽  
R.A.J. Janssen ◽  
G. Lanzani ◽  
G. Cerullo ◽  
M. Zavelani-Rossi ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Energy Transfer ◽  
Time Constant ◽  
Transfer Reaction ◽  
Polar Solvent ◽  
Phenylene Vinylene ◽  
Intramolecular Electron Transfer ◽  
Pump Probe ◽  
Energy And Electron Transfer ◽  
Probe Spectroscopy

ABSTRACTThe intramolecular photoinduced energy and electron transfer within a fullereneoligothiophene-fullerene triad with nine thiophene units (C60-9T-C60) and an oligo(p-phenylene vinylene)-fullerene dyad with four phenyl groups (OPV4-C60) is investigated with femtosecond pump-probe spectroscopy with sub-10 fs and 200 fs time resolution in solvents of different polarity. Photoexcitation of the π-conjugated oligomer moiety in the triad and dyad results in an ultrafast singlet-energy transfer reaction to create the fullerene singlet-excited state with a time constant of 150-190 fs, irrespective of the polarity of the medium. In a polar solvent, intramolecular electron transfer occurs from the oligomer moiety to the C60 moiety with a time constant of 10-13 ps as a secondary reaction, subsequent to the ultrafast singlet-energy transfer. The charge-separated state has a lifetime of 50-80 ps and recombines to the ground state.

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.

scholarly journals Direct estimation of the transfer integral for photoinduced electron transfer from TD DFT calculations

2017 ◽  
Vol 19 (46) ◽  
pp. 31007-31010 ◽  
Author(s):  
Lluís Blancafort ◽  
Alexander A. Voityuk
Keyword(s):  
Electron Transfer ◽  
Dft Calculations ◽  
Charge Separation ◽  
Photoinduced Electron Transfer ◽  
Simple Approach ◽  
Electronic Coupling ◽  
Td Dft ◽  
Photoinduced Charge Separation ◽  
Transfer Integral ◽  
Photoinduced Charge

A simple approach to estimate the electronic coupling for photoinduced charge separation in materials and biomolecules is proposed.

Electron and energy transfer in a porphyrin–oxoporphyrinogen–fullerene triad, ZnP–OxP–C60

2020 ◽  
Vol 22 (25) ◽  
pp. 14356-14363 ◽  
Author(s):  
Mandeep K. Chahal ◽  
Habtom B. Gobeze ◽  
Whitney A. Webre ◽  
Paul A. Karr ◽  
Daniel T. Payne ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Energy Transfer ◽  
Pump Probe ◽  
Zinc Porphyrin ◽  
Energy And Electron Transfer ◽  
Probe Spectroscopy

Competitive energy and electron transfer in a newly synthesized supramolecular triad composed of zinc porphyrin, oxoporphyrinogen and C60 has been demonstrated using ultrafast pump–probe spectroscopy.

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