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Symmetrical 1,3‐Dialkylimidazolium Based Ionic Liquid Crystals
Author(s) -
Rohini Rondla,
Lee ChingKuan,
Lu JungTang,
Lin Ivan J. B.
Publication year - 2013
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201200598
Subject(s) - mesophase , chemistry , liquid crystal , alkyl , lamellar structure , homeotropic alignment , crystallography , monolayer , phase (matter) , texture (cosmology) , diffraction , stereochemistry , organic chemistry , optics , biochemistry , physics , artificial intelligence , computer science , image (mathematics)
The synthesis and characterization for a series of symmetrical 1,3‐dialkylimidazolium salts with different chain lengths and counter anions together with their 1‐alkylimidazole precursors are described. Liquid crystal (LC) properties of these salts are studied. Images under polarizing optical microscopy show focal conic texture together with homeotropic domains. A smectic A mesophase, typical for rod‐like imidazolium salts, is assigned. Studies from powder X‐ray diffraction suggest a lamellar structure with noninterdigitated monolayer arrangement for the LC salts in the mesophase. In addition, a short note on the structure and property relationship for rod‐like, disc‐ or fan‐like, and dendritic shaped imidazolium ionic liquid crystals (ImILCs) forming smectic, columnar, and cubic phase is briefly summarized. A comparison of minimum alkyl chain length needed for 1‐alkyl‐3‐methyl and symmetrical 1,3‐dialkyl ImILCs to exhibit LC behavior is addressed.