scholarly journals Photoinduced Electron Transfer-Promoted Reactions Using Exciplex-Type Organic Photoredox Catalyst Directly Linking Donor and Acceptor Arenes

Molecules ◽  
2019 ◽  
Vol 24 (24) ◽  
pp. 4453
Author(s):  
Mugen Yamawaki ◽  
Akiko Asano ◽  
Toshiki Furutani ◽  
Yuki Izumi ◽  
Yosuke Tanaka ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Photoinduced Electron Transfer ◽  
Polar Solvent ◽  
Catalyst Activity ◽  
Excited Complex ◽  
Redox Catalyst ◽  
Low Concentrations ◽  
Donor And Acceptor

Directly linked donor and acceptor arenes, such as phenanthrene/naphthalene/biphenyl and 1,3-dicyanobenzene were found to work as photoredox catalysts in the photoreactions of indene, 2,3-dimethyl-2-butene, and 4-methoxyphenylacetic acid. The new stable organic photocatalyst forms an intramolecular exciplex (excited complex) when irradiated in a polar solvent and shows redox catalyst activity, even at low concentrations. To the best of our knowledge, this is the first example of an intramolecular exciplex working as a redox catalyst.

scholarly journals Thorpe−Ingold Effect on Photoinduced Electron Transfer of Dialkylsilylene-Spaced Divinylarene Copolymers Having Alternating Donor and Acceptor Chromophores

2007 ◽  
Vol 40 (26) ◽  
pp. 9238-9243 ◽  
Author(s):  
Mei-Yu Yeh ◽  
Hsin-Chieh Lin ◽  
Tsong-Shin Lim ◽  
Shern-Long Lee ◽  
Chun-hsien Chen ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Photoinduced Electron Transfer ◽  
Donor And Acceptor

Transient states in photoinduced electron transfer reactions of porphyrin- and phthalocyanine-fullerene dyads

2009 ◽  
Vol 13 (10) ◽  
pp. 1090-1097 ◽  
Author(s):  
Helge Lemmetyinen ◽  
Nikolai Tkachenko ◽  
Alexander Efimov ◽  
Marja Niemi
Keyword(s):  
Electron Transfer ◽  
Charge Separation ◽  
Photoinduced Electron Transfer ◽  
Transient State ◽  
Primary Electron ◽  
Transfer Reactions ◽  
Acceptor Pair ◽  
Electron Transfer Reactions ◽  
Exciplex Formation ◽  
Donor And Acceptor

This paper combines the most important results on studies performed by the authors during the last decade on photoinduced electron transfer reactions of pheophytin-, phthalocyanine-, and porphyrin-fullerene dyads, in which donor and acceptor moieties are covalently linked to each other. Practically all studied molecules form an intramolecular exciplex as a transient state before the formation of the charge separation state or tight ion pair. When the center-to-center distance of the donor and acceptor pair is short (7–10 Å) both the exciplex formation and primary electron transfer are extremely fast with rate constants of 7–23 × 1012 s -1 and 40–1400 × 109 s -1, respectively. Rates become slower when the distance and orientational fluctuation increases. No systematic correlation between free energies and the rates of the formation and recombination of the exciplex and the charge separation state, respectively, were observed. The mechanism is discussed in frames of the Marcus electron transfer and the radiationless quantum transition theories.

Synergistic effect of trimethylsilane for photoinduced electron transfer on 1,8-naphthalimides in polar solvent

2012 ◽  
Vol 246 ◽  
pp. 23-28 ◽  
Author(s):  
Dae Won Cho ◽  
Dae Won Cho ◽  
Hea Jung Park ◽  
Ung Chan Yoon ◽  
Myoung Hee Lee ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Synergistic Effect ◽  
Photoinduced Electron Transfer ◽  
Polar Solvent

Photoinduced Electron-Transfer and Electron-Mediating Processes of Fullerenes and Phenothiazine Oligomers in a Polar Solvent

2008 ◽  
Vol 81 (1) ◽  
pp. 103-109 ◽  
Author(s):  
D.-M. Shafiqul Islam ◽  
Yoshiko Sasaki ◽  
Hidehito Kawauchi ◽  
Masatoshi Kozaki ◽  
Yasuyuki Araki ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Photoinduced Electron Transfer ◽  
Polar Solvent

Photoinduced electron transfer from zinc tetraphenylporphyrin to 2-nitrofluorene in polar solvent acetonitrile

2015 ◽  
Vol 306 ◽  
pp. 55-65 ◽  
Author(s):  
Mihir Ghosh ◽  
Aruna K. Mora ◽  
Sukhendu Nath ◽  
P. Hemant Kumar ◽  
Prakriti Ranjan Bangal ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Photoinduced Electron Transfer ◽  
Polar Solvent
Sign in / Sign up

Export Citation Format

Share Document