Conformational equilibrium and orientational ordering:1H‐nuclear magnetic resonance of butane in a nematic liquid crystal

1995 ◽  
Vol 103 (16) ◽  
pp. 6891-6902 ◽  
Author(s):  
James M. Polson ◽  
E. Elliott Burnell
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Liquid Crystal ◽  
Magnetic Resonance ◽  
Nematic Liquid Crystal ◽  
Conformational Equilibrium ◽  
1H Nuclear Magnetic Resonance ◽  
Orientational Ordering ◽  
Nuclear Magnetic

Nuclear magnetic resonance spectra of ortho-, meta-, and para-difluorobenzenes in a nematic liquid crystal solvent

1969 ◽  
Vol 47 (6) ◽  
pp. 1057-1065 ◽  
Author(s):  
C. T. Yim ◽  
D. F. R. Gilson
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Liquid Crystal ◽  
Magnetic Resonance ◽  
Chemical Shift ◽  
Nematic Liquid Crystal ◽  
Hydrogen Atoms ◽  
Nuclear Magnetic Resonance Spectra ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

The proton and fluorine magnetic resonance spectra of ortho-, meta-, and para-difluorobenzene dissolved in a nematic liquid crystal solvent have been analyzed. Expressions for the anisotropy of the fluorine chemical shift were obtained but an attempt to fit these to the Karplus and Das theory failed. Hydrogen atoms ortho to fluorine show small displacements from their expected positions.

129Xe and 2H nuclear magnetic resonance (NMR) of xenon and deuterated-chloroform solutes in a thermotropic biaxial nematic liquid crystal

2011 ◽  
Vol 89 (9) ◽  
pp. 1143-1149 ◽  
Author(s):  
P. Tallavaara ◽  
A.M. Kantola ◽  
J. Jokisaari ◽  
T. Meyer ◽  
D.A. Wilson ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Liquid Crystal ◽  
Magnetic Resonance ◽  
Nematic Liquid Crystal ◽  
Nematic Phase ◽  
Deuterated Chloroform ◽  
H Nmr ◽  
Clear Change ◽  
Biaxial Nematic ◽  
Nuclear Magnetic

Properties of a thermotropic nematic liquid crystal (LC) TM35 (organosiloxane tetrapode) were investigated by means of nuclear magnetic resonance (NMR) spectroscopy of probe atoms and molecules. 129Xe isotope enriched xenon gas and 2H isotope enriched chloroform were used as probes. Both 129Xe and 2H NMR measurements were carried out over a wide temperature range, covering isotropic, nematic, and glass phases. A clear change in the behavior of the LC is observed within the nematic phase at 289 K by changing the temperature from low to high and inspecting the spectral line width. The derivative curve of the 129Xe chemical shift also reveals a change at 289 K. These changes may be an indication of hindered molecular rotation around the long axis, and the appearance of a biaxial nematic phase.

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