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Title of Journal: Appl Magn Reson

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Abbravation: Applied Magnetic Resonance

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Springer Vienna

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DOI

10.1016/0303-2647(74)90023-9

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1613-7507

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Features of spin exchange in nitroxide biradicals

Authors: V A Tran Aleksandr I Kokorin G Grampp K Rasmussen
Publish Date: 2009/07/03
Volume: 35, Issue: 3, Pages: 389-398
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Abstract

The intramolecular electron spin exchange has been studied by electron paramagnetic resonance EPR spectroscopy in the ionic liquid 1butyl3methylimidazolium hexafluorophosphate bmimPF6 for various nitroxide biradicals as a function of temperature and the nature of the connecting bridge between two NO· centers Temperature variations of the isotropic nitrogen hyperfine splitting constant a and exchange integral values J/a were measured from EPR spectra and analyzed Thermodynamic parameters of the conformational rearrangements were obtained The spin exchange in rigid and flexible biradicals dissolved in the ionic liquid bmimPF6 was compared with that in toluene solutions Interesting features of the spin exchange in biradicals in ionic liquid were observed and explained as a result of the specific intramolecular conformational transitions The first example of a rather rigid biradical molecule becoming flexible under the influence of an ionic liquid is reported

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  2. EPR Spectra of Transition-Metal Proteins: the Benefits of Data Deposition in Standard Formats
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  6. EPR and SEM study of organo-mineral associations in Lower Permian evaporite dolomites
  7. EPR Study of Ligand Effects in Spin Triads of Bis( o -Semiquinonato)Copper(II) Complexes
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