Torsion-Induced Nonradiative Relaxation of the Singlet Excited State of meso-Thienyl Bodipy and Charge Separation, Charge Recombination-Induced Intersystem Crossing in Its Compact Electron Donor/Acceptor Dyads

2021 ◽  
Author(s):  
Yu Dong ◽  
Maria Taddei ◽  
Sandra Doria ◽  
Laura Bussotti ◽  
Jianzhang Zhao ◽  
...  
Keyword(s):  
Excited State ◽  
Electron Donor ◽  
Charge Separation ◽  
Charge Recombination ◽  
Intersystem Crossing ◽  
Singlet Excited State ◽  
Nonradiative Relaxation ◽  
Donor Acceptor

scholarly journals Charge separation, charge recombination and intersystem crossing in orthogonal naphthalimide–perylene electron donor/acceptor dyad

2021 ◽  
Vol 20 (1) ◽  
pp. 69-85
Author(s):  
Xi Chen ◽  
Junhong Pang ◽  
Muhammad Imran ◽  
Xiaolian Li ◽  
Jianzhang Zhao ◽  
...  
Keyword(s):  
Electron Donor ◽  
Charge Separation ◽  
Charge Recombination ◽  
Intersystem Crossing ◽  
Donor Acceptor

scholarly journals Charge separation in the excited state electron donor—acceptor compounds containing the piperazine moiety

1991 ◽  
Vol 180 (6) ◽  
pp. 556-562 ◽  
Author(s):  
A.M. Brouwer ◽  
R.D. Mout ◽  
P.H.Maassen van den Brink ◽  
H.J. van Ramesdonk ◽  
J.W. Verhoeven ◽  
...  
Keyword(s):  
Excited State ◽  
Electron Donor ◽  
Charge Separation ◽  
State Electron ◽  
Donor Acceptor

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?

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.

scholarly journals Sc3N@Ih-C80 based donor–acceptor conjugate: role of thiophene spacer in promoting ultrafast excited state charge separation

RSC Advances ◽  
2020 ◽  
Vol 10 (34) ◽  
pp. 19861-19866
Author(s):  
Rubén Caballero ◽  
Luis David Servián ◽  
Habtom B. Gobeze ◽  
Olivia Fernandez-Delgado ◽  
Luis Echegoyen ◽  
...  
Keyword(s):  
Excited State ◽  
Charge Separation ◽  
Charge Recombination ◽  
Photoinduced Charge Separation ◽  
Donor Acceptor ◽  
Photoinduced Charge ◽  
State Charge

Photoinduced charge separation and dark charge recombination occurring within picoseconds is observed in newly synthesized triphenylamine–thiophene-Sc3N@Ih-C80 and triphenylamine–thiophene-C60 conjugates.

scholarly journals Long‐Lived Triplet Excited State Accessed with Spin–Orbit Charge Transfer Intersystem Crossing in Red Light‐Absorbing Phenoxazine‐Styryl BODIPY Electron Donor/Acceptor Dyads

ChemPhysChem ◽  
2020 ◽  
Vol 21 (13) ◽  
pp. 1388-1401 ◽  
Author(s):  
Yu Dong ◽  
Ayhan Elmali ◽  
Jianzhang Zhao ◽  
Bernhard Dick ◽  
Ahmet Karatay
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Electron Donor ◽  
Red Light ◽  
Intersystem Crossing ◽  
Spin Orbit ◽  
Triplet Excited State ◽  
Donor Acceptor

Spiro Rhodamine-Perylene Compact Electron Donor–Acceptor Dyads: Conformation Restriction, Charge Separation, and Spin–Orbit Charge Transfer Intersystem Crossing

2021 ◽  
Vol 125 (16) ◽  
pp. 4187-4203
Author(s):  
Mengyu Hu ◽  
Andrei A. Sukhanov ◽  
Xue Zhang ◽  
Ayhan Elmali ◽  
Jianzhang Zhao ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Electron Donor ◽  
Charge Separation ◽  
Intersystem Crossing ◽  
Spin Orbit ◽  
Donor Acceptor

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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