PELDOR at S- and X-Band Frequencies and the Separation of Exchange Coupling from Dipolar Coupling

A. Weber, Olav Schiemann, Bela Ernest Bode, TF. Prisner

Research output: Contribution to journalArticlepeer-review

89 Citations (Scopus)

Abstract

A pulsed electron double resonance (PELDOR) setup working at S-band frequencies is introduced and its performance compared with an X-band setup. Furthermore, to verify experimentally that it is possible to disentangle the dipolar coupling nu(Dip) from the exchange coupling J by PELDOR we synthesized and investigated four bisnitroxide radicals. They exhibit in pairs the same distances r(AB) between the nitroxide moieties but only one of each pair possesses a non-zero J. The experimental values for rAB match the ones from molecular modeling very well for the molecules without exchange coupling. For one bisnitroxide it was possible to separate nu(Dip) from J and to ascertain the magnitude and sign of J to +11 MHz (antiferromagnetic spin-spin coupling). (C) 2002 Elsevier Science (USA).

Original languageEnglish
Pages (from-to)277-285
Number of pages9
JournalJournal of Magnetic Resonance
Volume157
Issue number2
DOIs
Publication statusPublished - Aug 2002

Keywords

  • dipolar coupling
  • PELDOR
  • S-band EPR
  • pulse EPR
  • exchange coupling
  • ELECTRON-PARAMAGNETIC-RESONANCE
  • SPIN-ECHO
  • CORRELATION SPECTROSCOPY
  • NUCLEAR MODULATION
  • SPECTROMETER
  • DISTANCES
  • SOLIDS
  • ESE

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