Charge Recombination Dynamics of Geminate Ion Pairs Formed by Electron Transfer Quenching of Molecules in an Upper Excited State

2001 ◽  
Vol 105 (25) ◽  
pp. 5994-6000 ◽  
Author(s):  
Pierre-Alain Muller ◽  
Eric Vauthey
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Ion Pairs ◽  
Charge Recombination ◽  
Recombination Dynamics

scholarly journals Ultrafast Charge Recombination of Photogenerated Ion Pairs to an Electronic Excited State

2002 ◽  
Vol 106 (19) ◽  
pp. 4833-4837 ◽  
Author(s):  
Ana Morandeira ◽  
Laurine Engeli ◽  
Eric Vauthey
Keyword(s):  
Excited State ◽  
Ion Pairs ◽  
Charge Recombination ◽  
Electronic Excited State

Demonstrating the role of anchoring functionality in interfacial electron transfer dynamics in the newly synthesized BODIPY–TiO2 nanostructure composite

2017 ◽  
Vol 41 (12) ◽  
pp. 5215-5224 ◽  
Author(s):  
Sunil Aute ◽  
Partha Maity ◽  
Amitava Das ◽  
Hirendra N. Ghosh
Keyword(s):  
Electron Transfer ◽  
Charge Recombination ◽  
Interfacial Electron Transfer ◽  
Tio2 Nanostructure ◽  
Recombination Dynamics

Scheme illustrating the extent of coupling and charge recombination dynamics between BODIPY and NS-TiO2 anchoring through the catechol and resorcinol binding group.

scholarly journals Excited-state proton-coupled electron transfer within ion pairs

2020 ◽  
Vol 11 (13) ◽  
pp. 3460-3473 ◽  
Author(s):  
Wesley B. Swords ◽  
Gerald J. Meyer ◽  
Leif Hammarström
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Ion Pairs ◽  
Proton Coupled Electron Transfer ◽  
General Method ◽  
Salicylate Ion

Electrostatic ion pairs provide a general method to study excited-state proton-coupled electron transfer. A PTaETb mechanism is identified for the ES-PCET oxidation of salicylate within photoexcited cationic ruthenium–salicylate ion pairs.

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.

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