Abstract
In order to study what role the direction of the whole mesogenic groups play on their mesomorphic behavior we synthesized a series of bent-shaped dimers in which the mesogens differ in their relative orientation along the long molecular axis of the dimers. A tilted anticlinic smectic mesophase is presented exclusively by the dimer where the mesogens are tethered in a head-to-head fashion. The head-to-tail and tail-to-tail organizations of the mesogens preclude any kind of mesophase formation. The mesomorphic behavior of dimers was characterized by a combination of polarizing optical microscopy, differential scanning calorimetry and computational techniques.
Highlights
Two rigid mesogenic units connected by a conformationally flexible spacer constitutes a liquid crystal dimer (LCD) whose mesomorphic behavior manifests unique liquid crystal characteristics or resembles that observed in polymeric systems.[1,2] The liquid crystalline properties of LCDs include a strong dependence of their transitional properties on the length and parity of aliphatic spacers.[3,4,5] These methylene chains are considered mostly extended in an all-trans conformation within the mesophases.[4]
In order to study what role the direction of the whole mesogenic groups play on their mesomorphic behavior we synthesized a series of bent-shaped dimers in which the mesogens differ in their relative orientation along the long molecular axis of the dimers
The mesomorphic behavior of dimers was characterized by a combination of polarizing optical microscopy, differential scanning calorimetry and computational techniques
Summary
Two rigid mesogenic units connected by a conformationally flexible spacer constitutes a liquid crystal dimer (LCD) whose mesomorphic behavior manifests unique liquid crystal characteristics or resembles that observed in polymeric systems.[1,2] The liquid crystalline properties of LCDs include a strong dependence of their transitional properties on the length and parity of aliphatic spacers.[3,4,5] These methylene chains are considered mostly extended in an all-trans conformation within the mesophases.[4]. The phase transition behavior of compounds was investigated using differential scanning calorimetry (DSC) and polarizing optical microscopy (POM) methods.
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