EPR spin trapping evidence of radical intermediates in the photo-reduction of bicarbonate/CO2 in TiO2 aqueous suspensions

2015 ◽  
Vol 14 (5) ◽  
pp. 1039-1046 ◽  
Author(s):  
Alessandra Molinari ◽  
Luca Samiolo ◽  
Rossano Amadelli
Keyword(s):  
Spin Trapping ◽  
Reaction Intermediates ◽  
Reductive Activation ◽  
Radical Intermediates ◽  
Aqueous Suspensions ◽  
Epr Spin Trapping

Storage of CO2 as carbonates is a strategy for its reductive activation. Carbonates are reduced at pH 5.5–7.5 with photoexcited TiO2. EPR is convenient for detecting reaction intermediates.

scholarly journals Radical Intermediates in Photoinduced Reactions on TiO2 (An EPR Spin Trapping Study)

Molecules ◽  
2014 ◽  
Vol 19 (11) ◽  
pp. 17279-17304 ◽  
Author(s):  
Dana Dvoranová ◽  
Zuzana Barbieriková ◽  
Vlasta Brezová
Keyword(s):  
Spin Trapping ◽  
Radical Intermediates ◽  
Photoinduced Reactions ◽  
Epr Spin Trapping

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
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