Electron dipole-dipole ESEEM in field-step ELDOR of nitroxide biradicals

L. V. Kulik, Yu A. Grishin, S. A. Dzuba, I. A. Grigoryev, S. V. Klyatskaya, S. F. Vasilevsky, Yu D. Tsvetkov

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

The use of a rapid stepping of the magnetic field for investigation of electron dipole-dipole ESEEM in pulsed X-band ELDOR is described. The magnetic field jump, synchronized with a microwave pumping pulse, is positioned between the second and the third pulses of the stimulated echo pulse sequence. This echo is measured as a function of the delay between the first and the second pulses. The data are analyzed for a Fourier transform resulting in a Pake resonance pattern. To remove the electron-nuclear contributions to ESEEM, time traces with pumping were divided by those without. This resulted in complete elimination of electron-nuclear contributions, which is seen from the absence of peaks at nuclear frequencies and the similarity of results for protonated and deuterated solvents. For increasing the electron-electron modulation depth, a scanning of the magnetic field during the microwave pumping is proposed. The interspin distances and their distribution are determined for two long-chained (ca. 2 nm) nitroxide biradicals in glassy toluene and in frozen nematic liquid crystal 4-cyano-4′-pentyl-biphenyl. For the latter solvent, the alignment of the axis connecting two nitroxides in biradicals is quantitatively analyzed.

Original languageEnglish
Pages (from-to)61-68
Number of pages8
JournalJournal of Magnetic Resonance
Volume157
Issue number1
DOIs
Publication statusPublished - 1 Jan 2002
Externally publishedYes

Fingerprint

Electrons
dipoles
Magnetic Fields
pumping
Magnetic fields
Microwaves
pulses
electrons
echoes
magnetic fields
microwaves
Liquid Crystals
Nematic liquid crystals
Toluene
Fourier Analysis
superhigh frequencies
toluene
elimination
Fourier transforms
liquid crystals

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Kulik, L. V., Grishin, Y. A., Dzuba, S. A., Grigoryev, I. A., Klyatskaya, S. V., Vasilevsky, S. F., & Tsvetkov, Y. D. (2002). Electron dipole-dipole ESEEM in field-step ELDOR of nitroxide biradicals. Journal of Magnetic Resonance, 157(1), 61-68. https://doi.org/10.1006/jmre.2002.2579

Electron dipole-dipole ESEEM in field-step ELDOR of nitroxide biradicals. / Kulik, L. V.; Grishin, Yu A.; Dzuba, S. A.; Grigoryev, I. A.; Klyatskaya, S. V.; Vasilevsky, S. F.; Tsvetkov, Yu D.

In: Journal of Magnetic Resonance, Vol. 157, No. 1, 01.01.2002, p. 61-68.

Research output: Contribution to journalArticle

Kulik, LV, Grishin, YA, Dzuba, SA, Grigoryev, IA, Klyatskaya, SV, Vasilevsky, SF & Tsvetkov, YD 2002, 'Electron dipole-dipole ESEEM in field-step ELDOR of nitroxide biradicals', Journal of Magnetic Resonance, vol. 157, no. 1, pp. 61-68. https://doi.org/10.1006/jmre.2002.2579
Kulik, L. V. ; Grishin, Yu A. ; Dzuba, S. A. ; Grigoryev, I. A. ; Klyatskaya, S. V. ; Vasilevsky, S. F. ; Tsvetkov, Yu D. / Electron dipole-dipole ESEEM in field-step ELDOR of nitroxide biradicals. In: Journal of Magnetic Resonance. 2002 ; Vol. 157, No. 1. pp. 61-68.
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