1H spin-lattice NMR relaxation in the presence of residual dipolar interactions: Dipolar relaxation enhancement

Danuta Kruk, Pawel Rochowski, Malgorzata Florek-Wojciechowska, Pedro José Sebastião, David J Lurie, Lionel M Broche

Research output: Contribution to journalArticle

Abstract

A model of spin-lattice relaxation for spin-1/2 nuclei in the presence of a residual dipole-dipole coupling has been presented. For slow dynamics the model predicts a bi-exponential relaxation at low frequencies, when the residual dipole-dipole interaction dominates the Zeeman coupling. Moreover, according to the model a frequency-specific relaxation enhancement, referred to as Dipolar Relaxation Enhancement (DRE) in analogy to the Quadrupole Relaxation Enhancement (QRE) is expected. The frequency position of the relaxation maximum is determined by the amplitude of the residual dipole-dipole interaction. Experimental examples of relaxation properties that might be attributed to the DRE are presented. The DRE effect has the potential to be exploited, in analogy to QRE, as a unique source of information about molecular dynamics and structure.

Original languageEnglish
Article number106783
Number of pages7
JournalJournal of Magnetic Resonance
Volume318
Early online date13 Jul 2020
DOIs
Publication statusPublished - Sep 2020

Keywords

  • NMR
  • relaxation
  • dynamics
  • Relaxation
  • TIMES
  • Dynamics
  • DYNAMICS
  • TRANSLATIONAL DIFFUSION
  • LIQUIDS
  • RANGE
  • WATER

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