Liquid crystalline hydrogen-bonded ionic associates

Sahin Y., Diele S., Kresse H.

LIQUID CRYSTALS, cilt.25, sa.2, ss.175-178, 1998 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 25 Konu: 2
  • Basım Tarihi: 1998
  • Doi Numarası: 10.1080/026782998206317
  • Sayfa Sayıları: ss.175-178


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.