Electron paramagnetic evidence for molecular motion in the solid phase of the nematic liquid crystal Methoxy Benzylidene Butylaniline (MBBA)

1986 ◽  
Vol 60 (2) ◽  
pp. 129-131
Author(s):  
F.J. Owens
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Molecular Motion ◽  
Solid Phase ◽  
Electron Paramagnetic

Proton NMR Study of Molecular Motions in the Solid Phase of a Smectic A Liquid Crystal

1975 ◽  
Vol 53 (17) ◽  
pp. 1646-1650 ◽  
Author(s):  
Ronald Y. Dong ◽  
M. Wiszniewska ◽  
E. Tomchuk ◽  
E. Bock
Keyword(s):  
Activation Energy ◽  
Liquid Crystal ◽  
Molecular Motion ◽  
Solid Phase ◽  
Methyl Groups ◽  
Molecular Motions ◽  
Kcal Mole ◽  
Self Diffusion ◽  
Smectic A ◽  
Nmr Study

Proton T1, T1ρ, and T1D were studied in the solid phase of diethylazoxybenzoate from 105 K to the melting point. The activation energies for the threefold reorientation of methyl groups and for the molecular self-diffusion were determined to be about 3.3 and 11 kcal/mole respectively. Between 170 and 240 K, a new slow molecular motion with an estimated activation energy of 3.7 kcal/mole was detected via the T1ρ data.

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