PELDOR at S- and X-band frequencies and the separation of exchange coupling from dipolar coupling

Axel Weber, Olav Schiemann, Bela Bode, Thomas F. Prisner

Research output: Contribution to journalArticlepeer-review

90 Scopus citations

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 vDip from the exchange coupling J by PELDOR we synthesized and investigated four bisnitroxide radicals. They exhibit in pairs the same distances rAB 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 vDip from J and to ascertain the magnitude and sign of J to +11 MHz (antiferromagnetic spin-spin coupling).

Original languageEnglish
Pages (from-to)277-285
Number of pages9
JournalJournal of Magnetic Resonance
Volume157
Issue number2
DOIs
StatePublished - 2002
Externally publishedYes

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