13C chemical shifts and spin-lattice relaxation in the nematic liquid crystal 4-cyano-4′-n-pentylbiphenyl
- 15 January 1983
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 78 (2), 632-637
- https://doi.org/10.1063/1.444819
Abstract
The 13C chemical shifts and spin‐lattice relaxation times were obtained for all the resolved resonances in the isotropic and nematic phases of 5CB. NOE measurements were also obtained for the isotropic phase. A study of these data indicates that a flexibility gradient exists along the n‐pentyl chain and that D⊥, the rotational diffusion constant for the entire molecule, can be estimated. A study of the chemical shifts of 5CB shows that a single average shielding tensor is inadequate for a proper description of the chemical shifts of this liquid crystal molecule. These results are compared with those previously obtained for MBBA and PAA.Keywords
This publication has 12 references indexed in Scilit:
- 13C Relaxation Times Study of Liquid Crystalline p-Methoxybenzylidene-p-ButylanilineMolecular Crystals and Liquid Crystals, 1981
- Dipole-coupled carbon-13 spectra, a source of structural information on liquid crystalsMolecular Physics, 1979
- High resolution carbon-13 spin–lattice relaxation study of the nematogen p-methoxybenzylidene–p-?-butylanilineThe Journal of Chemical Physics, 1978
- 13C Spin-Lattice Relaxation Times in Liquid Crystalline p,p′-AzoxyanisoleBulletin of the Chemical Society of Japan, 1977
- Study of the isotropic-nematic-solid transitions in a liquid crystal by carbon-13—proton double resonancePhysical Review A, 1974
- Effect of phase transitions on carbon-13 nuclear magnetic resonance spectra in p-azoxydianisole, a nematic liquid crystalJournal of the American Chemical Society, 1974
- Temperature-dependent study of carbon-13 spin-lattice relaxation times in para -azoxyanisole-A nematic liquid crystalThe Journal of Chemical Physics, 1974
- Calculation of dipolar nuclear magnetic relaxation times in molecules with multiple internal rotations. II. Theoretical results for anisotropic over-all motion of the molecule, and comparison with 13C relaxation times in n -alkanes and n -alkyl bromidesThe Journal of Chemical Physics, 1974
- Carbon-13 Relaxation Time Measurements in Formic AcidThe Journal of Chemical Physics, 1971
- Effects of Anisotropic Molecular Rotational Diffusion on Nuclear Magnetic Relaxation in LiquidsThe Journal of Chemical Physics, 1968