Oxidation of sulfides and disulfides under electron transfer or singlet oxygen photosensitization using soluble or grafted sensitizers

2002 ◽  
Vol 1 (5) ◽  
pp. 347-354 ◽  
Author(s):  
S. Lacombe ◽  
H. Cardy ◽  
M. Simon ◽  
A. Khoukh ◽  
J. Ph. Soumillion ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Singlet Oxygen ◽  
Oxidation Of Sulfides

Singlet oxygen and electron-transfer in photooxidations

1990 ◽  
Vol 9 ◽  
pp. 75
Author(s):  
Christopher S. Foote ◽  
Richard Kanner
Keyword(s):  
Electron Transfer ◽  
Singlet Oxygen

The oxidation of sulfides by chromium(V)

2003 ◽  
Vol 81 (1) ◽  
pp. 75-80 ◽  
Author(s):  
Carmela R Jackson Lepage ◽  
Lynn Mihichuk ◽  
Donald G Lee
Keyword(s):  
Electron Transfer ◽  
Molecular Orbital ◽  
Radical Cation ◽  
Oxygen Transfer ◽  
Single Electron ◽  
Frontier Molecular Orbital ◽  
Molecular Orbital Calculations ◽  
Single Electron Transfer ◽  
Oxidation Of Sulfides

The mechanism for the oxidation of sulfides by [(me4-salen)CrV(O)(pyO)]CF3SO3, where me4-salen is 8,8,8',8'-tetramethylsalen and pyO is pyridine N-oxide, has been investigated. Results from Hammett correlations on the rates of oxidation of substituted thioanisoles, frontier molecular orbital calculations, and product studies are consistent with a mechanism that is initiated by a single electron transfer to give a radical cation intermediate.Key words: oxidation, chromium(V), sulfides, radical cation, oxygen transfer.

Determination of Singlet Oxygen and Electron Transfer Mediated Mechanisms of Photosensitized Protein Damage by Phosphorus(V)porphyrins

2015 ◽  
Vol 28 (2) ◽  
pp. 262-267 ◽  
Author(s):  
Kazutaka Hirakawa ◽  
Hironobu Umemoto ◽  
Ryo Kikuchi ◽  
Hiroki Yamaguchi ◽  
Yoshinobu Nishimura ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Singlet Oxygen ◽  
Protein Damage

Photosensitized Electron Transfer Oxidation of Sulfides: A Steady-State Study

2008 ◽  
Vol 2008 (15) ◽  
pp. 2612-2620 ◽  
Author(s):  
Sergio M. Bonesi ◽  
Maurizio Fagnoni ◽  
Angelo Albini
Keyword(s):  
Electron Transfer ◽  
Steady State ◽  
Oxidation Of Sulfides ◽  
State Study

scholarly journals Vacancy-enhanced generation of singlet oxygen for photodynamic therapy

2019 ◽  
Vol 10 (8) ◽  
pp. 2336-2341 ◽  
Author(s):  
Shanyue Guan ◽  
Li Wang ◽  
Si-Min Xu ◽  
Di Yang ◽  
Geoffrey I. N. Waterhouse ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Photodynamic Therapy ◽  
Oxygen Vacancy ◽  
Singlet Oxygen ◽  
Band Gap ◽  
Ruthenium Complex

Oxygen vacancy introduced defects in the band gap of BiOBr–H allow facile electron transfer from a photo-excited ruthenium complex to the semiconductor, thereby increasing ROS yields and PDT efficiency.

scholarly journals Surface-Doped Graphitic Carbon Nitride Catalyzed Photooxidation of Olefins and Dienes: Chemical Evidence for Electron Transfer and Singlet Oxygen Mechanisms

Catalysts ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 639 ◽  
Author(s):  
Apostolos Chatzoudis ◽  
Vasileios Giannopoulos ◽  
Frank Hollmann ◽  
Ioulia Smonou
Keyword(s):  
Electron Transfer ◽  
Energy Transfer ◽  
Singlet Oxygen ◽  
Carbon Nitride ◽  
Solvent Polarity ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Electron Transfer Mechanism ◽  
Heterogeneous Nature ◽  
Chemical Evidence

A new photocatalytic reactivity of carbon-nanodot-doped graphitic carbon nitride (CD-C3N4) with alkenes and dienes, has been disclosed. We have shown that CD-C3N4 photosensitizes the oxidation of unsaturated substrates in a variety of solvents according to two competing mechanisms: the energy transfer via singlet oxygen (1O2) and/or the electron transfer via superoxide (O·−2). The singlet oxygen, derived by the CD-C3N4 photosensitized process, reacts with alkenes to form allylic hydroperoxides (ene products) whereas with dienes, endoperoxides. When the electron transfer mechanism operates, cleavage products are formed, derived from the corresponding dioxetanes. Which of the two mechanisms will prevail depends on solvent polarity and the particular substrate. The photocatalyst remains stable under the photooxidation conditions, unlike the most conventional photosensitizers, while the heterogeneous nature of CD-C3N4 overcomes usual solubility problems.

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