Dielectric relaxation processes in some substituted amides in dilute solutions.

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概要

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• The dielectric measurements have been carried out in the microwave region (3.1 cm) over a range of temperatures on propionamide, <I>N</I>-methylpropionamide, <I>N</I>,<I>N</I>-dimethylpropionamide, and <I>N</I>-ethylacetamide. All the molecules except propionamide exhibit high value of distribution parameter. The dielectric dispersion, when resolved by Higasi, Koga, and Nakamura method gives two relaxation times τ(1) and τ(2) widely different from each other, suggesting the two separate processes occurring in the system. The enthalpies for different processes involved have been evaluated by the Eyring equations. The comparison with NMR data of enthalpy to Δ<I>H</I><SUB>τ(1)</SUB>, which is related to the process other than molecular, suggests that the rotation of–NR<SUB>2</SUB> group around the carbonyl carbon nitrogen bond is not feasible. The observed result indicates that this may be due to group inversion process. These results are in agreement with the earlier investigations of Saxena <I>et al.</I> on some substituted amides and of Phillips on <I>N</I>,<I>N</I>-dimethylamide using proton resonance spectra. The substituted amides in dilute solution of benzene exhibit some association with the benzene molecules.

• 公益社団法人 日本化学会の論文

著者

• SHUKLA J.

  Physics Department, Lucknow University

• Saxena M.

  Physics Department Lucknow University

• Saxena S.

  Physics Department Lucknow University

• Shukla J.

  Physics Department Lucknow University

関連論文

• Dielectric Relaxation of Dye-Doped Ferroelectric Liquid Crystal Mixture : A Comparative Study of Smectic C and Smectic A Phase
• Dielectric Relaxation of Dye-Doped Ferroelectric Liquid Crystal Mixture: A Comparative Study of Smectic C* and Smectic A Phase
• Dielectric relaxation processes in some substituted amides in dilute solutions.

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