scholarly journals Remote electron and energy transfer sensitized photoisomerization of encapsulated stilbenes

2020 ◽  
Vol 19 (7) ◽  
pp. 976-986
Author(s):  
Ramkumar Varadharajan ◽  
A. Mohan Raj ◽  
V. Ramamurthy
Keyword(s):  
Electron Transfer ◽  
Energy Transfer ◽  
Energy And Electron Transfer

Energy and electron transfer sensitizers present outside trigger the photoisomerization of encapsulated stilbenes; thus establishing communication between a donor and an acceptor is not arrested by a molecular wall.

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.

On the relation of energy and electron transfer in multidimensional chromophores based on polychlorinated triphenylmethyl radicals and triarylamines

2015 ◽  
Vol 17 (17) ◽  
pp. 11848-11867 ◽  
Author(s):  
Markus Steeger ◽  
Stefanie Griesbeck ◽  
Alexander Schmiedel ◽  
Marco Holzapfel ◽  
Ivo Krummenacher ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Energy Transfer ◽  
Energy And Electron Transfer ◽  
Triphenylmethyl Radicals

Chromophores with many donors and acceptors show electron transfer which is identical to energy transfer.

Supramolecular ultrafast energy and electron transfer in a directly linked BODIPY–oxoporphyrinogen dyad upon fluoride ion binding

2020 ◽  
Vol 56 (27) ◽  
pp. 3855-3858 ◽  
Author(s):  
Mandeep K. Chahal ◽  
Anuradha Liyanage ◽  
Habtom B. Gobeze ◽  
Daniel T. Payne ◽  
Katsuhiko Ariga ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Energy Transfer ◽  
Fluoride Ion ◽  
Ion Binding ◽  
Energy And Electron Transfer

Photosynthetic mimicry of sequential ultrafast energy transfer followed by electron transfer upon fluoride binding to the oxoporphyrinogen cavity in a BODIPY–oxoporphyrinogen dyad is demonstrated.

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.

scholarly journals Ultrafast exciton quenching by energy and electron transfer in colloidal CdSe nanosheet–Pt heterostructures

2015 ◽  
Vol 6 (2) ◽  
pp. 1049-1054 ◽  
Author(s):  
Kaifeng Wu ◽  
Qiuyang Li ◽  
Yongling Du ◽  
Zheyuan Chen ◽  
Tianquan Lian
Keyword(s):  
Electron Transfer ◽  
Energy Transfer ◽  
Energy And Electron Transfer

Large in-plane exciton mobility in CdSe nanosheets leads to ultrafast exciton quenching by energy transfer to Pt.

Light induced intramolecular energy and electron transfer events in carbazole–corrole and phenothiazine-corrole dyads

2020 ◽  
Vol 24 (05n07) ◽  
pp. 693-704
Author(s):  
B. Shivaprasadachary ◽  
A. R. Ramya ◽  
Govind Reddy ◽  
L. Giribabu
Keyword(s):  
Electron Transfer ◽  
Energy Transfer ◽  
Ground State ◽  
Transfer Rates ◽  
Fluorescence Studies ◽  
H Nmr ◽  
Quenching Efficiency ◽  
Energy And Electron Transfer ◽  
Donor Acceptor ◽  
Photo Induced Electron Transfer

We report two corrole based donor–acceptor (D–A) dyads, Cbz-Cor and Ptz-Cor to understand the energy/electron transfer reactions. In these D–A systems, the donor, either carbazole (Cbz) or phenothiazine (Ptz), is covalently connected at the meso-phenyl position of 10-(phenyl)-5,15-bis-(pentafluorophenyl)corrole (Ph-Cor) by C–N linkage. Both the dyads were characterized by 1H NMR, MALDI-TOF MS, UV-vis, electrochemical, computational methods, study state fluorescence and TCSPC techniques. A comparison of absorption spectra with their reference monomeric compounds (Cbz-Ph, Ptz-Ph and Ph-Cor) revealed minimal ground-state interactions between chromophores in both dyads. Fluorescence studies suggested that singlet–singlet energy transfer from 1Cbz* to corrole is the major photochemical pathway in the Cbz-Cor dyad with a quenching efficiency of [Formula: see text]99%. Detailed analysis of the data suggests that Forster’s dipole–dipole mechanism does not adequately explain this energy transfer. However, at a 410 nm excitation, florescence quenching is detected in Ptz-Cor (49%) supporting a photo induced electron transfer (PET) process from the ground state of PTZ to the excited state of corrole macrocycle. The electron-transfer rates ([Formula: see text] of Ptz-Cor are found in the range [Formula: see text] to [Formula: see text] and are concluded to be solvent dependent.

Photoinduced energy and electron transfer in micellar solutions of methylene blue

1988 ◽  
Vol 53 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Viktor Řehák ◽  
Yvona Rybová
Keyword(s):  
Methylene Blue ◽  
Electron Transfer ◽  
Energy Transfer ◽  
Ethylenediaminetetraacetic Acid ◽  
Sodium Dodecyl ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Quenching Rate ◽  
Pyrene Fluorescence ◽  
Energy And Electron Transfer

In the micellar medium of sodium dodecyl sulphate the monomer-dimer equilibrium of methylene blue is shifted markedly in favour of the monomer. Methylene blue quenches the fluorescence of pyrene solvated in micelles, which is explained in terms of resonance energy transfer. Based on the theoretical model, the pyrene fluorescence quenching constant in the micelles was determined (kqm = 1.8 106 s-1) and the average pyrene-methylene blue interaction distance for the singlet-singlet energy transfer estimated. The T1 → Tn absorption of methylene blue is quenched by pyrene and tetrasodium salt of ethylenediaminetetraacetic acid (EDTA); the quenching rate constants corresponding to the electron transfer are 5 106 and 2.05 108 1 mol-1 s-1, respectively.

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