Liquid crystalline hydrogen-bonded ionic associates

Sahin Y., Diele S., Kresse H.

LIQUID CRYSTALS, vol.25, no.2, pp.175-178, 1998 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 25 Issue: 2
  • Publication Date: 1998
  • Doi Number: 10.1080/026782998206317
  • Journal Name: LIQUID CRYSTALS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.175-178
  • Istanbul Technical University Affiliated: No


Phase diagrams of different substituted acids with 1-heptyl-4-( 4-pyridyl) pyridinium bromide were investigated. The formation of ionic hydrogen-bonded 1:1 and 1:2 associates can be detected in the solid state. In some cases thermodynamically stable smectic A phases are observed. The maximum phase stability in the liquid crystalline state can differ considerably from the expected value for the 1:1 associates. The layer thickness of the smectic layers measured by X-ray methods is smaller than the value calculated from molecular models. This indicates a complicated packing behaviour of the molecular building units in the SmA layers.