Intermolecular dipole-dipole relaxation of (129)Xe dissolved in water

J Magn Reson. 2000 Aug;145(2):302-6. doi: 10.1006/jmre.2000.2097.

Abstract

Intermolecular (129)Xe-(1)H nuclear Overhauser effects and (129)Xe longitudinal relaxation time measurements were used to demonstrate that the dipole-dipole coupling is the dominant relaxation mechanism for (129)Xe in water, at room temperature. (129)Xe-(1)H cross-relaxation rates were derived to be sigma(XeH) approximately 3.2 +/- 0.3 x 10(-3) s(-1), independent of xenon pressure (in the range of 1-10 bar) and of the presence of oxygen. Corresponding xenon-proton internuclear distances were calculated to be 2.69 +/- 0.12 A. Using the magnitude of the dipole-dipole coupling and the spin density ratio between dissolved xenon and bulk water, it is estimated that (129)Xe-(1)H spin polarization-induced nuclear Overhauser effects would yield little net proton signal enhancement in water.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Algorithms
  • Chemical Phenomena
  • Chemistry, Physical
  • Magnetic Resonance Spectroscopy
  • Water / chemistry
  • Xenon / chemistry*
  • Xenon Isotopes

Substances

  • Xenon Isotopes
  • Water
  • Xenon