Proton spin–lattice relaxation in selectively deuterated p,p′-azoxyanisoles
- 15 February 1977
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 66 (4), 1720-1725
- https://doi.org/10.1063/1.434099
Abstract
Proton spin–lattice relaxation rates 1/T1 are observed for the nematic liquid crystal PAA and its selectively deuterated species PAA‐d6 and PAA‐d8 in the nematic and in the isotropic states at frequencies of 15 and 55 MHz. The main relaxation process for the ring protons of PAA‐d6 is the thermal fluctuation of the order director, and the translational diffusion of the molecules also contributes to the relaxation rate of these protons. On the other hand, the methyl protons of PAA‐d8 relax predominantly through the translational diffusion in the nematic and isotropic phases. The thermal fluctuation of the order director makes a small contribution to the spin relaxation of the methyl protons in the nematic state and in the isotropic state near the transition point.Keywords
This publication has 29 references indexed in Scilit:
- Proton spin relaxation in methyl deuterated p a r a-azoxyanisoleThe Journal of Chemical Physics, 1976
- Effect of phase transitions on carbon-13 nuclear magnetic resonance spectra in p-azoxydianisole, a nematic liquid crystalJournal of the American Chemical Society, 1974
- Proton-spin thermometry at low fields in liquid crystalsPhysical Review A, 1974
- Temperature-dependent study of carbon-13 spin-lattice relaxation times in para -azoxyanisole-A nematic liquid crystalThe Journal of Chemical Physics, 1974
- Frequency dependence of the proton spin relaxation of the dipolar energy in a liquid crystalThe Journal of Chemical Physics, 1973
- Nuclear relaxation in liquid crystalsAdvances in Molecular Relaxation Processes, 1972
- Interpretation of the Nuclear Spin-Lattice Relaxation-Time Behavior in the Nematic MesophasesPhysical Review Letters, 1972
- Molecular Description of Nematic Liquid CrystalsPhysical Review A, 1970
- Quasielastic Rayleigh Scattering in Nematic Liquid CrystalsPhysical Review Letters, 1969
- The Mechanism of the Nitration of AnisoleJournal of the American Chemical Society, 1948