Perfluorodecyl decane, F(CF2)10(CH2)10H, is shown to undergo a liquid crystal-liquid crystal transition above room temperature. The accompanying reversible structural reorganization is observed by transmitted polarized light microscopy, small angle x-ray scattering and wide angle x-ray diffraction. Both liquid crystalline phases have a layered structure; within the layers the molecules are interdigitated, tilted relative to the layer normal, and packed in a pseudo-hexagonal fashion. The transformation between the structures is achieved by a change in molecular tilt, together with a change in the extent to which the molecules are interdigitated within each layer.
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Viney et al. (1989) studied this question.