Abstract

New symmetrical liquid crystal dimers composed of three-ring ester imine rod-shaped monomers with flexible alkyl chains of different parity were synthesized. The thermal stability of the newly synthesized compounds was determined using thermogravimetric analysis. The phase transition and mesogenic behavior of the compounds were explored using polarising optical microscopy and differential scanning calorimetry. Dimers with odd parity spacers exhibited the phase sequence Iso-N-Nx-SmX-Cr. The Nx phase transition was observed by polarising optical microscopy. This transition was distinct from that of the uniaxial nematic phase. The Nx phase was absent in the dimer with even parity spacers. A density functional theory study was carried out to investigate the stable configuration and influence of the solvent on the structural parameters, chemical reactivity parameters, and excited state properties of the molecules.

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