| | 1 | Author
| C. Forte, M. Geppi, C. A. Veracini | Requires cookie* | | | Title
| Study of the Molecular Dynamics from Deuterium Zeeman and Quadrupolar NMR Relaxation of 4,4'-di-n-Heptylazoxybenzene in the Nematic and Smectic A Phases  | | | | Abstract
| The deuterium spin-lattice (T1Z) and quadrupolar (r iQ) relaxation times of the liquid crystal 4,4'-Heptyl-azoxybenzene (HAB), deuterated on the aromatic rings and the first methylene group of the chains, have been measured by means of the Jeener-Broekaert pulse sequence at two different frequencies (10 and 46.04 M Hz) and throughout the nematic and the smectic A phase. By applying suitable models, we have determined rotational and reorientational diffusion coefficients and evalu ated the contribution of the different m otions (internal, molecular and collective) to the relaxation. In particular we have found a non negligible contribution from order director fluctuations. A comparison between the Tlz and Ti Q measurements performed by means of Jeener-Broekaert and Wimperis pulse sequences is also shown. | | | |
Reference
| Z. Naturforsch. 49a, 311 (1994); received August 16 1993 | | | |
Published
| 1994 | | | |
Keywords
| Liquid crystal, Deuterium N M R, M olecular dynamics, Deuterium relaxation, Director fluctuation | | | |
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| 49 | |
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