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Can I read A Time-Resolved EPR Study of the Electron-Spin-Polarization Pathways of p-Benzosemiquinone on EtoBox?
A Time-Resolved EPR Study of the Electron-Spin-Polarization Pathways of p-Benzosemiquinone by Martin Jäger; James R. Norris Jr. is a Chemistry article available to read on EtoBox.
What is A Time-Resolved EPR Study of the Electron-Spin-Polarization Pathways of p-Benzosemiquinone about?
Benzoquinone (BQ), deuterobenzoquinone (d 4 -BQ), and hydroquinone (BQH 2 ) are investigated in ethylene glycol by means of direct detection fast time-resolved EPR spectroscopy after laser flash photolysis. The development of the magnetization as a function of time and magnetic field is obtained and analyzed in terms of the Bloch equations and hyperfine parameters. The signals are attributed to the semiquinones BQH • and d 4 -BQH • . The presence of 1,2-dihydroxyethyl radicals during the photolysis of BQ and d 4 -BQ is verified. No alkyl radicals are observed in solutions of BQ with excess BQH 2 . Detailed analysis of the chemically induced dynamic electron polarization spectra with respect to their development in time shows that polarization patterns of the semiquinones can be traced back to a superposition of triplet mechanism and radical pair mechanism, the latter arising from geminate T-pairs. Hence, two independent pathways for polarization are assumed: reaction of triplet benzoquinone with ethylene glycol leads to the semiquinone and dihydroxyethyl radicals with all signals in emission, whereas the reaction of triplet BQ and BQH 2 yields two semiquinones exhibiting both net e
Who reads A Time-Resolved EPR Study of the Electron-Spin-Polarization Pathways of p-Benzosemiquinone?
It is typically read by researchers, students, and practitioners in Chemistry.
- Author
- Martin Jäger; James R. Norris Jr.
- Publisher
- Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 1090-7807)
- Published
- 2001
- Language
- EN
- Field
- Chemistry (Physical Sciences)