Abstract
ABSTRACT A distinct feature of the layer spacing has been observed on entering the SmC phase: the layer thickness initially decreases down about few degrees below the SmA to SmC transition temperature and then starts to increase again despite to the molecular tilt angle increases further with a reduction in temperature. This observation cannot be explained by the tilting of the molecule as an entity. Our results of the IR spectroscopy show that the orientational behaviours of terminal chains are distinctly different from that of the rigid core and clearly show that any model considering orientation of the molecule as an entity cannot be correct. A compensation model is used to explain it, where a contraction of the layer caused by the tilt of the mesogen is re-compensated by a simultaneous expansion of the layer of the fluorinated chain.
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