NMR Studies of the Pressure Dependence of Self-Diffusion in Four Organic Solids
- 15 May 1966
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 44 (10), 3647-3649
- https://doi.org/10.1063/1.1726510
Abstract
NMR pulse techniques have been used to study the influence of hydrostatic pressure on self‐diffusion in four organic solids composed of nearly spherical molecules: cyclohexane, 2,2‐dichloropropane, t‐butyl chloride, and t‐butyl bromide. The self‐diffusion was studied from the pressure and temperature dependence of T2, the spin—spin relaxation time, at pressures between 1 and 680 atm, and at temperatures within 10–50 deg of the melting point. The measured activation volumes were 8%—15% of the molar volumes. Comparable ratios have been previously observed for rotational motion in similar solids. The activation enthalpies for self‐diffusion were 5–6 kcal/mole, somewhat exceeding the values for rotational motion. Comparisons are made with the latent volumes and enthalpies of fusion.Keywords
This publication has 22 references indexed in Scilit:
- Nuclear Spin Relaxation by Translational Diffusion. III. Spin-Spin RelaxationPhysical Review B, 1963
- Nuclear magnetic resonance in solids containing small moleculesJournal of Physics and Chemistry of Solids, 1961
- Plastic crystals: A historical reviewJournal of Physics and Chemistry of Solids, 1961
- Proton Magnetic Resonance of the CH3 Group. V. Temperature Dependence of T1 in Several Molecular CrystalsThe Journal of Chemical Physics, 1959
- Effect of Pressure on Self-Diffusion in White PhosphorusThe Journal of Chemical Physics, 1955
- Nuclear Spin Relaxation in Alkali MetalsPhysical Review B, 1955
- Effects of Diffusion on Free Precession in Nuclear Magnetic Resonance ExperimentsPhysical Review B, 1954
- A nuclear magnetic resonance investigation of solid cyclo hexaneProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1953
- Spin EchoesPhysical Review B, 1950
- Relaxation Effects in Nuclear Magnetic Resonance AbsorptionPhysical Review B, 1948