2H NMR and X-Ray Studies of a Substance Exhibiting Crystal-Like Smectic Phases

DSC, polarizing optical microscopy and X-ray diffractometry were used to investigate the mesomorphic behaviour of 4-n-butyl-4′-acetyl-biphenyl, which resulted to exhibit a smectic E and, possibly, a smectic K phase. Additionally, 2 H NMR spectroscopy was applied on a selectively deuterated sample to...

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Bibliographic Details
Published in:Molecular crystals and liquid crystals (Philadelphia, Pa. : 2003) Pa. : 2003), 2007-04, Vol.465 (1), p.109-119
Main Authors: Calucci, L., Geppi, M., Przedmojski, J., Czub, J., Urban, S., Dabrowski, R.
Format: Article
Language:English
Subjects:
4-n-butyl-4′-acetyl-biphenyl
deuterium NMR
dielectric spectroscopy
smectic E phase
smectic K phase
X-ray
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Summary:DSC, polarizing optical microscopy and X-ray diffractometry were used to investigate the mesomorphic behaviour of 4-n-butyl-4′-acetyl-biphenyl, which resulted to exhibit a smectic E and, possibly, a smectic K phase. Additionally, 2 H NMR spectroscopy was applied on a selectively deuterated sample to study the properties of alignment of the mesophases within a magnetic field, as well as to characterize molecular dynamics. Two motional processes were found to be active in the smectic E phase, namely fast π-flips of the benzene rings and molecular self-diffusion about the herringbone bidimensional lattice of the layers. No molecular overall diffusional motions were observed by either 2 H NMR spectroscopy or dielectric relaxation measurements.
ISSN:1542-1406
1563-5287
DOI:10.1080/15421400701205636