'H-NMR spectroscopy is employed to investigate the orientational order in the nematic and smectic A, B, and crystal G phases formed by 4-( 2-methylbuty1)phenyl 4'n-heptylbiphenyl- 4-carboxylate-d,, . Evidence of the lock in the trans-conformation of the first two mcthylene groups of the n-heptyl chain is found in the S, and C; phases. The dynamics of the aromatic molecular core are studied in a temperature interval including the SA-S, transition, by the analysis of the deuterium Zeeman and Quadrupolar relaxation times using the rotational diffusion model. Hence the diffusion constants related to the molecular spinning and tumbling motions are evaluated.

A H-2 NMR study of orientational order, phase transitions and dynamics in a liquid crystalline compound

CATALANO, DONATA INES MARIA;GEPPI, MARCO;
1996-01-01

Abstract

'H-NMR spectroscopy is employed to investigate the orientational order in the nematic and smectic A, B, and crystal G phases formed by 4-( 2-methylbuty1)phenyl 4'n-heptylbiphenyl- 4-carboxylate-d,, . Evidence of the lock in the trans-conformation of the first two mcthylene groups of the n-heptyl chain is found in the S, and C; phases. The dynamics of the aromatic molecular core are studied in a temperature interval including the SA-S, transition, by the analysis of the deuterium Zeeman and Quadrupolar relaxation times using the rotational diffusion model. Hence the diffusion constants related to the molecular spinning and tumbling motions are evaluated.
1996
Catalano, DONATA INES MARIA; Ciampi, E; Fodorcsorba, K; Forte, C; Geppi, Marco; Imbardelli, D.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/46098
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