engleski

The effect of terminal chain length on mesogenic properties of bent-shaped dimers

Liquid crystals are organic molecules with properties between solid crystal and conventional fluid: the fluidity of the liquid and some structural and optical properties of crystals. According to temperature and physical properties, the liquid-crystalline phase occurs between solid and liquid and therefore is called the mesophase and the compounds mesogenic compounds. Liquid crystal molecules can self-organize into different mesophases that exhibit characteristic textures visible under a polarizing microscope. Depending on the arrangement and orientation of molecules in space, smectic, nematic, cholesteric and columnar mesophases are most often distinguished [1]. The formation of mesophases is primarily governed by the shape of the molecule ; bent-shaped dimers are particularly interesting because they can form helical structures without chirality at the molecular level [2]. In order to examine the structure-property relationship, bent-shaped dimers that consist of two mesogenic units connected by a flexible odd spacer and differ in the length of the terminal chain were synthesized. The mesogenic properties of the prepared dimers were investigated. It is generally observed that increasing the length of the terminal chain stabilizes the smectic phase.

liquid crystals ; terminal chain length ; mesogenic properties ; bent-shaped dimers

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