13 C NMR Observation of Molecular Motions at the Smectic-A-Smectic-C (Smectic-C ) Transition in a Recemic (Chiral) Smectic Liquid Crystal
We have studied molecular motions and the microscopic environment at the SmA-SmC (SmC * ) transition in a racemic (chiral) smectic liquid crystal by means of 13 C NMR with CP/MAS and without sample spinning. Fast overall fluctuation caused by the existence of the molecular chirality has been observe...
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| Veröffentlicht in: | Japanese Journal of Applied Physics 1990-07, Vol.29 (7A), p.L1153 |
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| Hauptverfasser: | , , , |
| Format: | Artikel |
| Sprache: | eng |
| Online-Zugang: | Volltext |
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| Zusammenfassung: | We have studied molecular motions and the microscopic environment at the SmA-SmC (SmC
*
) transition in a racemic (chiral) smectic liquid crystal by means of
13
C NMR with CP/MAS and without sample spinning. Fast overall fluctuation caused by the existence of the molecular chirality has been observed in the SmA phase by
T
1
measurements. Static NMR spectra indicate that the conformation of the enantiomer in the SmC
*
phase is different from that of the corresponding racemic compound in the SmC phase. |
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| ISSN: | 0021-4922 1347-4065 |
| DOI: | 10.1143/JJAP.29.L1153 |