Measurement of Concentration of Singlet Molecular Oxygen in the Gas Phase by Electron Paramagnetic Resonance

2004 ◽  
Vol 33 (2) ◽  
pp. 152-153 ◽  
Author(s):  
Mikio Yagi ◽  
Syougo Takemoto ◽  
Ryouji Sasase
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Gas Phase ◽  
Molecular Oxygen ◽  
Singlet Molecular Oxygen ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic

Evaluation of EPR monitoring of singlet oxygen production using the photosensitizer chloroboron subphthalocyanine

2011 ◽  
Vol 15 (02) ◽  
pp. 118-121 ◽  
Author(s):  
Lawrence J. Berliner ◽  
Helmut Görner ◽  
Heinz-Peter Schuchmann
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Singlet Oxygen ◽  
Reaction System ◽  
Oxygen Production ◽  
Crucial Aspect ◽  
Singlet Molecular Oxygen ◽  
Radical Product ◽  
Paramagnetic Resonance ◽  
Boron Subphthalocyanine ◽  
Electron Paramagnetic

Singlet molecular oxygen produced in the presence of 2,2,6,6-tetramethyl-4-piperidone (TMPD) in 1,4-dioxan, by boron subphthalocyanine chloride as the sensitizer, was monitored by Electron Paramagnetic Resonance (EPR) via the oxidation of TMPD to the corresponding aminoxyl radical. This radical product is formed in low yields along the singlet oxygen pathway. A kinetic analysis of the process allows one to understand the reasons behind this, while affording more accurate quantitative insights into the mechanistic details. A crucial aspect of this reaction system, which explains the low aminoxyl radical yields along the singlet oxygen pathway, is the disappearance of the sensitizer triplet state in a reaction with TMPD, which has a rate constant of 1 × 109 M-1.s-1.

Probing the Structure and Visible Light Photocatalytic Mechanism of LaVO4/TiO2 Composite Using XRD, BET, and EPR

2012 ◽  
Vol 217-219 ◽  
pp. 737-740
Author(s):  
Han Jie Huang
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Visible Light ◽  
Gas Phase ◽  
Spin Trapping ◽  
X Ray Diffraction ◽  
Paramagnetic Resonance ◽  
X Ray ◽  
Photocatalytic Mechanism ◽  
Electron Paramagnetic ◽  
Visible Light Photocatalytic

In this work, a visible light-induced LaVO4/TiO2 composite has been characterized by powder X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) and spin-trapping electron paramagnetic resonance (EPR) to reveal the structure and visible light photocatalytic mechanism for the decompostion of benzene in gas-phase. Based on the experimental results, a visible light-induced photochemical processes on LaVO4/TiO2 are proposed and elucidated.

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