Jump to main content
Jump to site search

Issue 8, 2010
Previous Article Next Article

Nematic phases of bent-core mesogens

Author affiliations

Abstract

Bent-core mesogens derived from 4-cyanoresorcinol with terminal alkyl chains have been synthesized and investigated by polarizing microscopy, XRD and electro-optical methods. Short chain compounds have exclusively nematic phases which can be cooled to ambient temperature. These nematic phases are similar to ordinary nematic phases with only nearest neighbour correlation (N) whereas long chain compounds form SmC-type cybotactic clusters and these cybotactic nematic phases (NcybC) can be regarded as strongly fragmented SmC phases. The chain length dependent as well as temperature dependent structural transition from N to NcybC is continuous and associated with a change of the position and intensity of the small angle scattering in the XRD patterns. Moreover, a temperature dependent stepwise transition from cybotactic nematic phases to different types of non-polar and tilted smectic phases (SmC(I) and SmC(II)) is observed with a mesophase composed of elongated, but not yet fused cybotactic clusters (CybC) as an intermediate state of this transition. This improves the understanding of the nature and special properties of the nematic phases formed by bent-core molecules as well as their transition to smectic phases and it paves the way to new materials with spontaneous or field-induced biaxial nematic phases at ambient temperatures.

Graphical abstract: Nematic phases of bent-core mesogens

Back to tab navigation

Supplementary files

Publication details

The article was received on 06 Nov 2009, accepted on 23 Jan 2010 and first published on 02 Mar 2010


Article type: Paper
DOI: 10.1039/B923262A
Citation: Soft Matter, 2010,6, 1704-1721
  •   Request permissions

    Nematic phases of bent-core mesogens

    C. Keith, A. Lehmann, U. Baumeister, M. Prehm and C. Tschierske, Soft Matter, 2010, 6, 1704
    DOI: 10.1039/B923262A

Search articles by author

Spotlight

Advertisements