Electric-Field-Induced Reorientation of a Ferroelectric Liquid Crystal Molecule without a Carboxylate Group near the Stereocenter Studied by Time-Resolved Infrared Spectroscopy Combined with Normalized Sample−Sample Two-Dimensional Correlation Spectroscopy

2003 ◽  
Vol 107 (18) ◽  
pp. 4227-4236 ◽  
Author(s):  
J. G. Zhao ◽  
K. Tatani ◽  
T. Yoshihara ◽  
Y. Ozaki
Keyword(s):  
Infrared Spectroscopy ◽  
Liquid Crystal ◽  
Electric Field ◽  
Correlation Spectroscopy ◽  
Liquid Crystal Molecule ◽  
Ferroelectric Liquid Crystal ◽  
Carboxylate Group ◽  
Two Dimensional ◽  
Time Resolved ◽  
Time Resolved Infrared Spectroscopy

Submicrosecond Preliminary Process of Electric-Field-Induced Reorientation of a Ferroelectric Liquid Crystal, 5-(2-Fluoroalkoxy)-2-(4-n-Alkylphenyl)-Pyrimidine, Studied by Time-Resolved Infrared Spectroscopy

1995 ◽  
Vol 49 (7) ◽  
pp. 977-980 ◽  
Author(s):  
Norihisa Katayama ◽  
Takashi Sato ◽  
Yukihiro Ozaki ◽  
Katsuyuki Murashiro ◽  
Makoto Kikuchi ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
Delay Time ◽  
Strong Influence ◽  
Spectroscopic Technique ◽  
Ferroelectric Liquid Crystal ◽  
Time Resolved ◽  
Rigid Rod ◽  
Time Resolved Infrared Spectroscopy ◽  
Reorientation Process

Pulsed electric-field-induced reorientation of a ferroelectric liquid crystal (FLC), 5-(2-fluorooctyloxy)-2-(4-hexylphenyl)-pyrimidine, has been investigated by using a dispersive submicrosecond time-resolved infrared spectroscopic technique. The observed absorbance decay for a band at 1440 cm−1 due to a ring-stretching mode of the phenylpyrimidine group indicates that the FLC molecule reorients from a stationary state with a slight delay (less than 1 μs) just after the upswing of the electric field, while counter-reorientation occurs with a delay time of a microsecond after the reverse of the electric field. The delay time for the counter-reorientation changes with temperature, indicating that the viscosity has a strong influence on the delay time. It is also indicated in the present study that the whole FLC molecule reorients simultaneously as a rigid rod in both the preliminary and the counter-reorientation process.

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