Abstract
Abstract Both smectic hexatic phases, Hex-B and Sm-F, were found m some three-ring 2-methylthlenyi derivatives terminated wth alkoxyl substituents. In a homologous series THI, the molecular terminal chains promote either tilted (for short chains) or orthogonal (for long chains) hexatic mesophases. For intermediate length chains (having 14 or 15 carbon atoms), the phase sequence is Hex-B - Sm-F - SmC - Sm-A. Thus phase sequence allows observation of two new triple points involving Hex-B phase. For some halogen substituted thienyl derivatives other mixed-tilt type phase sequence, Cry-G - Sm-F - Hex-B - Sm-A is found. Phase transitions involving hexatic phases were studied by DSC and X-ray scattering method.
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