Quantitative EPR Spin Trapping. 1. Nitrogen Dioxide Radicals and Nitrite Ions from Energetic Materials in Alkaline Aqueous Solution

1997 ◽  
Vol 101 (10) ◽  
pp. 1848-1853 ◽  
Author(s):  
M. D. Pace ◽  
A. J. Carmichael
Keyword(s):  
Aqueous Solution ◽  
Nitrogen Dioxide ◽  
Energetic Materials ◽  
Spin Trapping ◽  
Alkaline Aqueous Solution ◽  
Epr Spin Trapping

Free Radicals from Photolysis of (NTO) 5-Nitro-2,4-Dihydro-3H-1,2,4-Triazol-3-One Studied by EPR Spin Trapping

1995 ◽  
Vol 418 ◽  
Author(s):  
M. D. Pace ◽  
L. Fan ◽  
T. Burkey
Keyword(s):  
Aqueous Solution ◽  
Free Radicals ◽  
Free Radical ◽  
Alkaline Solution ◽  
Anion Radical ◽  
Chemical Reduction ◽  
Spin Trapping ◽  
Radical Formation ◽  
Alkaline Aqueous Solution ◽  
Epr Spin Trapping

AbstractNTO (5-Nitro-2,4-dihydro-3H-1,2,4-triazol-3-one)is shown to form aphotochemical free radical in alkaline aqueous solution containing nitromethane (CH3NO2). The NTO free radical can also be produced by chemical reduction of NTO with hydroquinone in alkaline solution. Details of radical formation and assignment of the NTO radical to a nitro anion radical, having the NTO ring intact, are presented.

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.

Microwave Induced Free Radicals Production in Red Wine and Model Wine by EPR Spin Trapping

2021 ◽  
Author(s):  
Jiangfeng Yuan ◽  
Zhuoyao Chen ◽  
Dahong Wang ◽  
Minggui Gong ◽  
Zhijun Qiu
Keyword(s):  
Free Radicals ◽  
Red Wine ◽  
Spin Trapping ◽  
Epr Spin Trapping

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
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