DSC, polarizing optical microscopy and X-ray diffractometry were used to investigate the mesomorphic behavior of 4-n-butyl-4'-acetyl-biphenyl, which resulted to exhibit a smectic E and, possibly, a smectic K phase. Addnl., 2H 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 mol. dynamics. Two motional processes were found to be active in the smectic E phase, namely fast à-flips of the benzene rings and mol. self-diffusion about the herringbone bidimensional lattice of the layers. No mol. overall diffusional motions were obsd. by either 2H NMR spectroscopy or dielec. relaxation measurements.
2H NMR and X-ray studies of a substance exhibiting crystal-like smectic phases
Calucci L;
2007
Abstract
DSC, polarizing optical microscopy and X-ray diffractometry were used to investigate the mesomorphic behavior of 4-n-butyl-4'-acetyl-biphenyl, which resulted to exhibit a smectic E and, possibly, a smectic K phase. Addnl., 2H 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 mol. dynamics. Two motional processes were found to be active in the smectic E phase, namely fast à-flips of the benzene rings and mol. self-diffusion about the herringbone bidimensional lattice of the layers. No mol. overall diffusional motions were obsd. by either 2H NMR spectroscopy or dielec. relaxation measurements.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
