Liquid crystalline hydrogen-bonded ionic associates

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Abstract
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.