Identification of a Defect Chain Motion in n-Alkanes by Means of NMR Spin-Lattice Relaxation Time Measurements

  • E C Reynhardt
  • I Basson
Conference paper


Proton spin-lattice relaxation time measurements in the rotating frame as a function of inverse temperature have revealed shallow minima not previously observed for a series of n-alkanes ranging from n-C22H46 to n-C41H84.The most likely reorientational model is one in which a thermally activated trans-gauche defect motion modulates the internuclear dipolar interactions. The results suggest that the gauche defect equilibrium orientation has a higher energy than that of the ordered all-trans equilibrium orientation. Activation energies for the motion as well as energy differences between the two orientations have been extracted from the results for these n-alkanes.

PACS number



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Copyright information

© Springer-Verlag Berlin Heidelberg 1990

Authors and Affiliations

  • E C Reynhardt
    • 1
  • I Basson
    • 1
  1. 1.Department of PhysicsUniversity of South AfricaPretoriaSouth Africa

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