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Il Nuovo Cimento D

, Volume 1, Issue 1, pp 41–48 | Cite as

EPR study of the rotational dynamics of the peroxylamindisulphonate radical in alcohols

  • U. Segre
  • L. Pasimeni
Article

Summary

The rotational dynamics of the radical peroxylamindisulphonate dissolved in methanol, ethanol,n-propanol andn-butanol has been studied by EPR. Marked deviations from the ideal Brownian diffusion model follow from the line width analysis, which are ascribed to hydrogen bonding with the solvent. Freed's model of local fluctuating structures accounts for the results in methanol only. The anomalous behaviour observed for the other solvents should be a consequence of the greater stability of the bounded complexes.

Keywords

Nitroxide Nitroxide Radical TEMPONE Magnetic Tensor Stable Nitroxide Radical 
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.

Riassunto

La dinamica rotazionale del radicale perossilammindisolfonato, in soluzione di metanolo, etanolo,n-propanolo en-butanolo, è stata studiata con la spettroscopia EPR. Dall'analisi delle larghezze di riga si ottengono dei notevoli scostamenti rispetto al modello ideale di diffusione, browniana, che sono da attribuirsi alla presenza di legami ad idrogeno con le molecole di solvente. Il modello delle strutture locali proposto da Freed rende conto dei risultati sperimentali solo per il caso del metanolo. Il comportamento anomalo che si osserva per gli altri solventi dovrebbe essere una conseguenza della maggiore stabilità dei complessi legati.

Резюоме

С помощью ЭПР исследуется ротационная динамика радикала перок-силамин-дисульфоната, растворенного в метаноле, этаноле,n-пропаноле иn-бутаноле. Заметньые отклонения от идеальной модели броуновской диффуузии следуют из анализа шириньи линий, что приписьивается связи водорода с растворителем. Модль фрида для локальньих фликтуирующих структур обьясняет полученньие резлътаттьи толъко в метаноле. Аномальное поведение, обнаруженное для друтих растворителей, повидимому, является следствием вьисокой стабильности связаннйих комплексов.

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Copyright information

© Società Italiana di Fisica 1982

Authors and Affiliations

  • U. Segre
    • 1
  • L. Pasimeni
    • 1
  1. 1.Istituto di Chimica Fisica dell'UniversitàPadovaItalia

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