Title

Hybrid Rod-like and Bent-core Liquid Crystal Dimers Exhibiting Biaxial Smectic A and Nematic Phases

Publication Title

Journal of Materials Chemistry

Publication Date

9-11-2012

Document Type

Article

DOI

10.1039/C2JM34315K

Keywords

mesophases, polarizing optical microscopy, x-ray diffraction studies

Disciplines

Chemistry | Materials Chemistry | Physics

Abstract

Liquid crystal hybrid dimers involving bent-core units and rod-like units were designed, synthesized and investigated by a combination of polarizing optical microscopy (POM),differential scanning calorimetry (DSC) and X-ray diffraction studies. All the four unsymmetrical dimers 1–4 exhibited stable nematic phases over a wide temperature range. Moreover, dimer 1exhibited the biaxial smectic A (SmA) phase and dimer 2 exhibited a highly ordered mesophase below the nematic (N) phase. Two rod-like and bent-core nematogenic units were covalently linked in dimers 3 and 4 to furnish exclusively the nematic phase. The observation of the biaxial SmA phase underlying the nematic phase in one of the bent-core–rod dimers 1 would be a significant step forward towards achieving the biaxial nematic phase and resolving controversies related to the presence of cybotactic groups.

Share

COinS