Mechanism of photodegradation of aqueous organic pollutants. 1. EPR spin-trapping technique for the determination of hydroxyl radical rate constants in the photooxidation of chlorophenols following the photolysis of hydrogen peroxide

1991 ◽  
Vol 95 (13) ◽  
pp. 5116-5120 ◽  
Author(s):  
Jan Kochany ◽  
James R. Bolton
Keyword(s):  
Hydrogen Peroxide ◽  
Hydroxyl Radical ◽  
Organic Pollutants ◽  
Rate Constants ◽  
Spin Trapping ◽  
Epr Spin Trapping ◽  
Spin Trapping Technique

Photoredox Reactions of Iodo Iron(III) Complexes Containing Tetradentate Ligands

2001 ◽  
Vol 66 (1) ◽  
pp. 109-118 ◽  
Author(s):  
Jozef Šima ◽  
Dáša Lauková ◽  
Vlasta Brezová
Keyword(s):  
Schiff Bases ◽  
Spin Trapping ◽  
Molar Ratio ◽  
Oh Radicals ◽  
Solvated Electrons ◽  
Open Chain ◽  
Tetradentate Ligands ◽  
Visible Irradiation ◽  
Epr Spin Trapping ◽  
Spin Trapping Technique

Photoredox reactions occurring in irradiated methanolic solutions of trans-[FeIII(R,R'-salen)(CH3OH)I], where R,R'-salen2- are N,N'-ethylenebis(R,R'-salicylideneiminato), tetradentate open-chain N2O2-Schiff bases with R,R' = H, 5-Cl, 5-Br, 3,5-di-Br, 3,5-di-(CH3), 3-OCH3, 5-OCH3, have been investigated and their mechanism proposed. The complexes are redox-stable in the dark. Ultraviolet and/or visible irradiation of methanolic solution of the complexes induces photoreduction of Fe(III) to Fe(II). Depending on the composition of the irradiated solutions, •CH2OH radicals or solvated electrons were identified by the EPR spin trapping technique. The final product of the photooxidation coupled with the photoreduction of Fe(III) is formaldehyde and the molar ratio of Fe(II) and CH2O is close to 2 : 1. The efficiency of the photoredox process is strongly wavelength-dependent and influenced by the peripheral groups R,R' of the tetradentate ligands.

Reactions of the hydroxyl radical. Part 2.—Determination of absolute rate constants

1965 ◽  
Vol 61 (0) ◽  
pp. 1417-1424 ◽  
Author(s):  
G. E. Adams ◽  
J. W. Boag ◽  
B. D. Michael
Keyword(s):  
Hydroxyl Radical ◽  
Rate Constants ◽  
Absolute Rate

Photodynamic action of C-phycocyanins obtained from marine and fresh water cyanobacterial cultures: A comparative study using EPR spin trapping technique

2006 ◽  
Vol 40 (8) ◽  
pp. 821-825 ◽  
Author(s):  
Bibbin Tom Paul ◽  
Anamika Patel ◽  
Govindan Sadasivam Selvam ◽  
Sandhya Mishra ◽  
Pushpita Kumar Ghosh ◽  
...  
Keyword(s):  
Comparative Study ◽  
Fresh Water ◽  
Spin Trapping ◽  
Photodynamic Action ◽  
Epr Spin Trapping ◽  
Spin Trapping Technique

scholarly journals Fused-Ring Derivatives of Quinoxalines: Spectroscopic Characterization and Photoinduced Processes Investigated by EPR Spin Trapping Technique

Molecules ◽  
2014 ◽  
Vol 19 (8) ◽  
pp. 12078-12098 ◽  
Author(s):  
Zuzana Barbieriková ◽  
Dana Dvoranová ◽  
Maroš Bella ◽  
Viktor Milata ◽  
Adriana Czímerová ◽  
...  
Keyword(s):  
Spectroscopic Characterization ◽  
Spin Trapping ◽  
Fused Ring ◽  
Epr Spin Trapping ◽  
Derivatives Of ◽  
Spin Trapping Technique ◽  
Photoinduced Processes
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