Synthesis, mesomorphic and dielectric properties of new bent-core liquid crystal with a terminal lactate group


Ocak H. , Canli N. Y. , Bilgin Eran B.

Journal of Molecular Structure, vol.1223, 2021 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 1223
  • Publication Date: 2021
  • Doi Number: 10.1016/j.molstruc.2020.128975
  • Title of Journal : Journal of Molecular Structure
  • Keywords: Bent-core liquid crystal, Lactate group, Ferroelectric switching, Impedance spectroscopy, Dielectric properties, Conductivity mechanism, POLAR ORDER, ELECTROMAGNETIC PROPERTIES, SPONTANEOUS POLARIZATION, MAGNETIC-PROPERTIES, CONDUCTIVITY, TEMPERATURE, CHIRALITY, BEHAVIOR, PHASE, ACID

Abstract

© 2020 Elsevier B.V.The synthesis, liquid crystalline properties and dielectric properties of a new bent-core compound (DBOB) composed of terephthalate based rod-like units with a O-dodecyl lactate group substituted at one side as well as n-octyloxy located at other terminal are presented. The liquid crystalline properties have been investigated by polarizing optical microscopy, differential scanning calorimetry and electro-optical studies. The dielectric parameters and phase regions of DBOB, which exhibits an enantiotropic non-polar SmA phase between 156 and 100 °C as well as SmA phase with a ferroelectric polar response at lower temperatures than 100 °C, have been carried out by impedance spectroscopy at different temperatures. The dielectric relaxation mechanisms have been analyzed by Cole-Cole plots. The Debye distribution parameters and activation energies have also been determined.