Applied Magnetic Resonance

, Volume 19, Issue 3–4, pp 413–420 | Cite as

Molecular dynamics of n-dodecylammonium chloride studied by nuclear magnetic resonance

  • Z. Fojud
  • E. Szczesniak
  • K. Jurga
  • S. Jurga
Article

Abstract

The relation between molecular dynamics and phase properties of the bilayered compound C12H25NH3C1 is studied by differential scanning calorimetry, proton second moment, and spin-lattice relaxation times. In the low-temperature phase I of the compound methyl and ammonium groups execute a classical threefold reorientation, while the alkylammonium chains are rigid on the nuclear magnetic resonance time scale. In the intermediate-temperature phase δ a trans-gauche isomerization of the alkyl chains is observed. In the high-temperature phase α the reorientation of the whole chains about their long axes, which are parallel to the normal to the ionic layer is evidenced. In the metastable ε phase the dynamics involves classical rotation of methyl and ammonium groups and CH2 groups motion of the trans-gauche isomerization type.

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Copyright information

© Springer 2000

Authors and Affiliations

  • Z. Fojud
    • 1
  • E. Szczesniak
    • 1
  • K. Jurga
    • 1
  • S. Jurga
    • 1
  1. 1.Institute of PhysicsAdam Mickiewicz UniversityPoznańPoland

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