https://doi.org/10.65770/LRWY4450
ABSTRACT
A new homologues series of azo-ester containing tert-butyl terminal group has been synthesised and investigated for its mesomorphic properties. The series consists of total eleven homologues (A1-A14) in which lower homologues (A1-A3) are non-mesomorphic in nature due to lack of molecular flexibility. The higher homologues (specifically A4–A14) demonstrate consistent enantiotropic nematic phases. The liquid crystal phase remains stable at broad range of temperatures. The phase transition temperatures and characteristic textures of homologues were identified via polarised optical microscopy (POM) using heating stage and differential scanning calorimetry (DSC). The observed texture of nematic phase is schlieren or threaded. Thermal, analytical and spectral (IR, 1H NMR, Mass analysis) data confirmed the molecular structure.
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