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Liquid Crystals Volume 33, 2006 - Issue 6
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Original Articles

(S)‐Isoleucine and (R)‐2‐octanol as chiral precursors of new chiral liquid crystalline thiadiazoles: synthesis, mesomorphic and ferroelectric properties

M. Parra Facultad de Ciencias Químicas, Departamento de Química Orgánica, Universidad de Concepción, Casilla 160‐C, Concepción, ChileCorrespondence[email protected]
,
J. Vergara Facultad de Ciencias‐Instituto de Ciencia de Materiales de Aragón, Química Orgánica, Universidad de Zaragoza‐C.S.I.C., 50009‐Zaragoza, España
,
P. Hidalgo Facultad de Ciencias Químicas, Departamento de Química Orgánica, Universidad de Concepción, Casilla 160‐C, Concepción, Chile
,
J. Barberá Facultad de Ciencias‐Instituto de Ciencia de Materiales de Aragón, Química Orgánica, Universidad de Zaragoza‐C.S.I.C., 50009‐Zaragoza, España
&
T. Sierra Facultad de Ciencias‐Instituto de Ciencia de Materiales de Aragón, Química Orgánica, Universidad de Zaragoza‐C.S.I.C., 50009‐Zaragoza, España
Pages 739-745 | Accepted 27 Feb 2006, Published online: 20 Feb 2007
 
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Abstract

New chiral Schiff bases with a 1,3,4‐thiadiazole unit in the rigid core were synthesized (SB1–SB4). These compounds contain a chiral chain derived from (S)‐isoleucine and (R)‐2‐octanol. Their liquid crystalline properties were studied by polarizing optical microscopy, differential scanning calorimetry and X‐ray diffraction. Thereby it was found that most of the new compounds exhibit a chiral Smectic C phase. A study of the ferroelectric properties is described.

Acknowledgement

This work was supported by FONDECYT (Grant 1030696, 7040041) and Dirección de Investigación, Universidad de Concepción.

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