ESR and ENDOR investigations of the degenerate electron exchange reactions of various viologens in solution. Solvent dynamical effects

  • G. Grampp
  • B. Y. Mladenova
  • D. R. Kattnig
  • S. Landgraf


The temperature dependences of the rates of the degenerate electron transfer of various viologens (1,1′-di(hydrocarbyl)-4,4′-bipyridinium salts) are measured in seven different solvents by means of electron spin resonance (ESR) line broadening. Rates vary between 1.7·108 and 1.1·109 M−1s−1 at room temperature and clearly show a solvent dynamical effect, which is inferred from the dependence of the rate constants on the longitudinal relaxation time of the solvent. Activation energies ranging from 5.3 to 24.4 kJ mol−1 are found. For the first time, hyperfine coupling constants are reported for the radical cations of the hydroxyethyl viologen and the amino viologen based on both continuous-wave ESR and electron-nuclear double resonance spectroscopy. Furthermore, the temperature and the solvent dependence of the hyperfine coupling constants of the methyl viologen radical cation are reported.


Electron Spin Reso Electron Spin Reso Spectrum Propylene Carbonate Reorganization Energy ENDOR Spectrum 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer 2006

Authors and Affiliations

  • G. Grampp
    • 1
  • B. Y. Mladenova
    • 1
  • D. R. Kattnig
    • 1
  • S. Landgraf
    • 1
  1. 1.Institute of Physical and Theoretical ChemistryGraz University of TechnologyGrazAustria

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