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Time-resolved FT-IR study on reorientation of ferroelectric liquid crystal, (S)-4-methylhexyl 4-[4-(decyloxy) phenylethynyl]-2-fluorobenzate.
Autorzy
Rok wydania
1993
Czasopismo
Numer woluminu
47
Strony
1382-1385
DOI
10.1366/0003702934067388
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
The electric-field-induced reorientation of (S)-4-methylhexyl 4-[4-(decyloxy) phenylethynyl]-2-fluorobenzate in the Sc* phase was investigated by using an asynchronous time-resolved FT-IR technique. The band assignments were made on the basis of the polarized FT-IR spectra and FT-Raman spectrum. The time-resolved study indicates that the reorientation occurs immediately after the electric field is applied. The molecule reorients as a unit; however the rigid core of the molecule seems to be more mobile than the hydrocarbon chains and needs a shorter period of time for the reorientation. The change of orientation is not completely finished in a 500-μs time period. Of particular note is the behavior of the carbonyl band; this band, usually strong in infrared spectra, is very weak in the time-resolved spectra.
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