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Banana-shaped 1,2,4-oxadiazoles

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Abstract

3,5-Disubstituted 1,2,4-oxadiazoles are a new type of liquid crystalline (LC) compounds with asymmetrical five-membered heterocycle as a central unit. They have a bent shape and are very convenient model-compounds for studying the dependence of the LC properties on the molecular design. We have also synthesized and investigated ‘banana-shaped’ 1,2,4-oxadiazoles using the ester groups as the linkage units. The new compounds exhibit spontaneous polarization in the smectic phase, even if there is no chiral group in the molecules. Preliminary experimental data suggest the presence of spontaneous polarization in the nematic phase as well. In order to study the structural properties of the LC phases, X-ray diffraction (XRD) measurements on powder samples have been carried out. Based on the XRD data, a model of the structural arrangement of the bent molecules in the smectic phase is provided, which accounts for the macroscopic spontaneous polarization as well as the ferroelectric switching behavior.

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Authors and Affiliations

  1. Organic Intermediates and Dyes Institute, FSUE «NIOPIK’, B. Sadovaya 1/4, 123995, Moscow, Russia

    S. I. Torgova & T. A. Geivandova

  2. Dipartimento di Fisica e Ingegneria dei Materiali e del Territorio and INFM, Universitá Politecnica délie Marche, Via Brecce Bianche, III-60131, Ancona, Italy

    O. Francescangeli

  3. Dipartimento di Fisica and INFM, Politecnico di Torino, C. Duca degli Abruzzi 24, I-10129, Torino, Italy

    A. Strigazzi

  4. Joint Laboratory of Orientationally Ordered Media (OOM-Lab), C. Duca degli Abruzzi 24, I-10129, Torino, Italy

    S. I. Torgova, T. A. Geivandova & A. Strigazzi

Authors
  1. S. I. Torgova
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  2. T. A. Geivandova
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  3. O. Francescangeli
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  4. A. Strigazzi
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Torgova, S.I., Geivandova, T.A., Francescangeli, O. et al. Banana-shaped 1,2,4-oxadiazoles. Pramana - J Phys 61, 239–248 (2003). https://doi.org/10.1007/BF02708306

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