The influence of driving force on intramolecular electron transfer: A theoretical study of subphthalocyanine‐AzaBODIPY‐C 60 supramolecular triad

2019 ◽  
Vol 120 (7) ◽  
Author(s):  
Wenlan Chen ◽  
Zhiqian Chen ◽  
Shaohui Zheng
Keyword(s):  
Electron Transfer ◽  
Driving Force ◽  
Theoretical Study ◽  
Intramolecular Electron Transfer

scholarly journals Solvatochromic and Ligand Effects in Ultrafast Intramolecular Electron Transfer in Fe-based Molecular Photosensitizers

2019 ◽  
Vol 205 ◽  
pp. 09029
Author(s):  
Kristjan Kunnus ◽  
Lin Li ◽  
Marco Reinhard ◽  
Sergey Koroidov ◽  
Kasper S. Kjaer ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Charge Transfer ◽  
Driving Force ◽  
Reorganization Energy ◽  
The Other ◽  
Intramolecular Electron Transfer ◽  
Ligand Effects ◽  
Ligand Charge Transfer ◽  
Excited State Lifetimes

Metal-to-ligand charge-transfer (MLCT) excited state lifetimes of [Fe(CN)4(2,2’-bipyridine)]2- and [Fe(CN)4(2,3-bis(2-pyridyl)pyrazine)]2-exhibit strong solvent and ligand dependence. We conclude that these effects can be described with Marcus-like model where changes in the MLCT energy correspond directly to the changes in the electron transfer driving force and all the other factors (e.g. reorganization energy) can be considered constant.

Synthesis, Characterization, and Theoretical Study of Sulfur-Containing Donor−Acceptor DCNQI Derivatives with Photoinduced Intramolecular Electron Transfer

1996 ◽  
Vol 61 (9) ◽  
pp. 3041-3054 ◽  
Author(s):  
Nazario Martín ◽  
José L. Segura ◽  
Carlos Seoane ◽  
Enrique Ortí ◽  
Pedro M. Viruela ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Theoretical Study ◽  
Intramolecular Electron Transfer ◽  
Donor Acceptor ◽  
Sulfur Containing

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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