Electron paramagnetic resonance monitoring for on-demand electrochemically-generated radicals

Morsy, Mohamed A.; Kawde, Abdel‐Nasser

doi:10.1016/j.electacta.2015.02.014

Cited by 8 publications

(4 citation statements)

References 40 publications

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“…Although the spectrum was too complex to assign hyperfine spacing (hfs) for the 75 lines, WinSim-EPR software available from the National Institute of Environmental Health Sciences (NIEHS) [ 22 ], simulated the anthracene EPR spectrum. Previous studies have substantiated the ability of the WinSim-EPR software to simulate the EPR spectrum of other complex radical systems [ 20 , 21 ]. The superimposed spectra in Figure 3 display the close fit between the experimental and simulated EPR spectra.…”

Section: Resultsmentioning

confidence: 99%

“…Due to the growing interest in radical detection and identification, electron paramagnetic resonance (EPR) spectroscopy is uniquely suited as a technique for monitoring free radical kinetics. We have previously reported using EPR spectroscopy as an analytical tool for free radical intermediates generated by different oxidation processes such as the irradiation of alanine [ 19 ] and the chemical and electrochemical oxidations of active ingredients in drug formulations [ 20 , 21 ]. In this work, we report the investigation of the free radical reactions of anthracene in concentrated sulfuric acid using EPR spectroscopy, which can be seen as a model system for other PAHs.…”

Section: Introductionmentioning

confidence: 99%

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Electron and proton magnetic resonance spectroscopic investigation of anthracene oxidation

Morsy

Kawde

Kamran

et al. 2021

Heliyon

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The work reports a method for monitoring anthracene radical-mediated oxidation reactions using electron paramagnetic resonance (EPR) spectroscopy. The formation of anthracene dimer product was well-defined using 1 H-NMR and 1 H-1 H correlation spectroscopy (COSY). Unrestricted 3-21G/B3LYP DFT was used to estimate radical hyperfine spacing (hfs), then to identify the characteristic EPR-spin transitions of anthracene radical intermediate. A detailed investigation of an anthracene oxidation reaction and its possible reaction mechanism in concentrated sulphuric acid is conducted as a model system for polyaromatic hydrocarbons. Peak-to-peak (p2p) intensities of selected EPR-spectral lines were used to evaluate anthracene's oxidation kinetic model. The findings showed that radical intermediate formation is a unimolecular autocatalytic process, dimerization is a pseudo-zeroorder reaction, and the latter is the rate-determining step with a half-life of 48 AE 2 min at 25.0 C.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electron and proton magnetic resonance spectroscopic investigation of anthracene oxidation

Morsy

Kawde

Kamran

et al. 2021

Heliyon

Self Cite

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“…The potential of the WE in these experiments was typically between À0.2 and À0.3 V. It is very likely that the setup presented here can be improved by integrating the electrolysis cell with the EPR resonator by commercial solution, 44 or with a thin capillary setup. 45…”

Section: Ec-oe-dnp Samplementioning

confidence: 99%

Electrochemical Overhauser dynamic nuclear polarization

Tamski

Milani

Roussel

et al. 2020

Phys. Chem. Chem. Phys.

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“…A powerful technique for characterization of ionizing induced defects is Electron Paramagnetic Resonance (EPR). In addition, EPR is used to evaluate polymerization reactions [1] , catalysis [2] , laser [3] , free radicals in living tissues and fluids [4] and drug detection [5] . EPR is a useful technique for solid state dosimetry.…”

Section: Introductionmentioning

confidence: 99%

Radiation effects on microstructure and EPR signal of yttrium oxide rods

Santos

Rodrigues

Campos

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Designing nanostructured materials with high dosimetric efficiency is a great challenge in radiation dosimetry research. From rare-earth series, yttrium oxide is considered as excellent host matrix for rare-earth ions, leading to formation of advanced functional materials with optical, mechanical, chemical, and thermal properties notably improved. Nevertheless, there is a lack of information which correlates microstructural characteristics and performance of rare earths. This work aims to evaluate the radiation effects on microstructure and EPR signal of Y 2 O 3 rods produced by colloidal processing followed by sintering at 1600ºC/4h in air. Ceramic rods were exposed to gamma radiation with doses up to 100kGy. Microstructural and dosimetric characterizations were performed by XRD, SEM and EPR techniques. Yttrium oxide rods as sintered exhibited dense microstructure (96.6% theoretical density) and linear EPR dose response behaviour for wide dose range. These results reveal that yttrium oxide is a promising material for radiation dosimetry.

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Electron paramagnetic resonance monitoring for on-demand electrochemically-generated radicals

Cited by 8 publications

References 40 publications

Electron and proton magnetic resonance spectroscopic investigation of anthracene oxidation

Electron and proton magnetic resonance spectroscopic investigation of anthracene oxidation

Electrochemical Overhauser dynamic nuclear polarization

Radiation effects on microstructure and EPR signal of yttrium oxide rods

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