Ultrafast Charge Recombination Dynamics in Ternary Electron Donor–Acceptor Complexes: (Benzene)2-Tetracyanoethylene Complexes

2016 ◽  
Vol 120 (48) ◽  
pp. 12390-12403 ◽  
Author(s):  
Chih-Chung Chiu ◽  
Chih-Chang Hung ◽  
Po-Yuan Cheng
Keyword(s):  
Electron Donor ◽  
Charge Recombination ◽  
Donor Acceptor ◽  
Recombination Dynamics

Light harvesting vesicular donor–acceptor scaffold limits the rate of charge recombination in the presence of an electron donor

2014 ◽  
Vol 7 (5) ◽  
pp. 1661-1669 ◽  
Author(s):  
Rijo T. Cheriya ◽  
Ajith R. Mallia ◽  
Mahesh Hariharan
Keyword(s):  
Charge Transfer ◽  
Survival Time ◽  
Electron Donor ◽  
Self Assembly ◽  
Light Harvesting ◽  
Charge Recombination ◽  
Donor Acceptor

This work highlights the utility of π–π stacked self-assembly for enhanced survival time of charge transfer intermediates upon photoexcitation of donor–acceptor systems.

scholarly journals Making triplets from photo-generated charges: observations, mechanisms and theory

2020 ◽  
Vol 19 (2) ◽  
pp. 136-158 ◽  
Author(s):  
Dáire J. Gibbons ◽  
Aram Farawar ◽  
Paul Mazzella ◽  
Stéphanie Leroy-Lhez ◽  
René M. Williams
Keyword(s):  
Excited State ◽  
Electron Donor ◽  
Charge Recombination ◽  
Triplet Excited State ◽  
Spin Flip ◽  
Donor Acceptor ◽  
A Charge

Photo-excitation of electron donor–acceptor systems can lead to the generation of a charge separated state (CT). Sometimes the charge recombination occurs mainly to the local triplet excited state (T1). How does the spin flip?

scholarly journals Effect of the excitation pulse carrier frequency on the ultrafast charge recombination dynamics of donor-acceptor complexes: Stochastic simulations and experiments

2004 ◽  
Vol 121 (8) ◽  
pp. 3643-3656 ◽  
Author(s):  
Roman G. Fedunov ◽  
Serguei V. Feskov ◽  
Anatoly I. Ivanov ◽  
Olivier Nicolet ◽  
Stéphane Pagès ◽  
...  
Keyword(s):  
Carrier Frequency ◽  
Charge Recombination ◽  
Excitation Pulse ◽  
Stochastic Simulations ◽  
Donor Acceptor ◽  
Recombination Dynamics

Long-lived charge-separated states of simple electron donor-acceptor dyads using porphyrins and phthalocyanines

2008 ◽  
Vol 12 (09) ◽  
pp. 993-1004 ◽  
Author(s):  
Kei Ohkubo ◽  
Shunichi Fukuzumi
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Electron Donor ◽  
Driving Force ◽  
Reorganization Energy ◽  
Charge Recombination ◽  
Zinc Phthalocyanine ◽  
Intramolecular Electron Transfer ◽  
Triplet Excited State ◽  
Donor Acceptor

Control of electron-transfer processes is described for a number of electron donor-acceptor dyads containing porphyrins or phthalocyanines as models for the photosynthetic reaction center. The rates for intramolecular electron transfer in the dyads are controlled by the driving force and reorganization energy of electron transfer. The small reorganization energy of electron transfer reactions and large driving force of charge recombination are required to form long-lived charge-separated states. A directly linked zinc chlorin-fullerene dyad, especially, has the longest lifetime of charge-separated state at 120 s at -150 °C, which is a much longer lifetime and higher energy than those of natural photosynthetic reaction centers. On the other hand, the charge-separated states of the phthalocyanine-based donor-acceptor dyads (silicon phthalocyanine-fullerene, and zinc phthalocyanine-perylenebisimide) are short-lived since charge recombination forms the low-lying triplet excited state of the chromophore. The energy of the charge-separated state of a zinc phthalocyanine-perylenebisimide dyad is decreased by binding of metal ions to the radical anion moiety in order to be lower than the triplet excited state. This results in formation of a long-lived charge-separated state. The mechanistic viability of formation of long-lived charge-separated states is demonstrated by a variety of examples based on the Marcus theory of electron transfer.

Intersystem crossing via charge recombination in a perylene–naphthalimide compact electron donor/acceptor dyad

2020 ◽  
Vol 8 (24) ◽  
pp. 8305-8319
Author(s):  
Muhammad Imran ◽  
Ahmed M. El-Zohry ◽  
Clemens Matt ◽  
Maria Taddei ◽  
Sandra Doria ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Triplet State ◽  
Singlet Oxygen ◽  
Electron Donor ◽  
Charge Recombination ◽  
Intersystem Crossing ◽  
Donor Acceptor ◽  
State Production

Efficient triplet state production (singlet oxygen quantum yield: 80%) by SOCT-ISC was observed for a perylene–naphthalimide compact electron donor/acceptor dyad.

scholarly journals Ultrafast photoinduced charge transport in Pt(ii) donor–acceptor assembly bearing naphthalimide electron acceptor and phenothiazine electron donor

2014 ◽  
Vol 16 (47) ◽  
pp. 25775-25788 ◽  
Author(s):  
Igor V. Sazanovich ◽  
Jonathan Best ◽  
Paul A. Scattergood ◽  
Michael Towrie ◽  
Sergei A. Tikhomirov ◽  
...  
Keyword(s):  
Charge Transport ◽  
Electron Donor ◽  
Electron Acceptor ◽  
Charge Separation ◽  
Charge Recombination ◽  
Photoinduced Charge Separation ◽  
Donor Acceptor ◽  
Photoinduced Charge

The Pt(ii)-based molecular triad engages in step-wise photoinduced charge-separation; the charge recombination occurs through-space via two distinct pathways.

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