Ionic interaction of tri-armed structure based on benzene ring: synthesis and characterization

Liquid crystalline is a state of matter which combines the properties of liquid and a crystalline solid. Ionic liquid crystals are a new class of materials which exhibit phase transition at low temperature. A new structure was synthesized based on a benzene ring carrying three armed, two arms of triazine ring and the third arm is phenoxy benzene. The presence of alkyl chain groups on the periphery reduced the mesophase transitions which are desirable for low-temperature applications of liquid crystals. The substitution was achieved efficiently by Sonogashira coupling. The tri-armed compound was synthesized successfully through cross-coupling. However, it was oily and no transition phase was observed. Therefore, to increase the liquid crystal possibility, the compound was mixed with 4-(dodecyloxy)benzoic acid (4-DBA) with 1:1 ratio to produce an organic salt through hydrogen bonding. The organic salt obtained by ionic interaction between the tri-armed compound and 4-DBA exhibited a phase transition at low temperature. However, ionic liquid crystals are important class of mesomorphic materials and have considered as sealants due to their very low vapour pressure which demonstrated a proficient electrolyte systems for their anisotropic phase such as high ionic conductivity and diffusion along with excellent thermal stability. All the intermediate compounds and final compounds were confirmed by spectroscopic techniques (H-1 NMR, C-13 NMR, FT-IR, and HRMS). [GRAPHICS] .

Automated summary

A new tri-armed compound was successfully synthesized through Sonogashira coupling, further mixed with 4-DBA to produce an organic salt with phase transition at low temperature. The obtained ionic liquid crystals showed excellent thermal stability and conductivity, making them suitable for applications as sealants.