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Hybrid Rod-Like And Bent-Core Liquid Crystal Dimers Exhibiting Biaxial Smectic A And Nematic Phases, Yan Wang, Hyung Yoon, Hari Bisoyi, Satyendra Kumar, Quan Li
Hybrid Rod-Like And Bent-Core Liquid Crystal Dimers Exhibiting Biaxial Smectic A And Nematic Phases, Yan Wang, Hyung Yoon, Hari Bisoyi, Satyendra Kumar, Quan Li
Satyendra Kumar
Liquid crystal hybrid dimers involving bent-core units and rod-like units were designed, synthesized and investigated by a combination of polarizing optical microscopy (POM), differential scanning calorimetry (DSC) and X-ray diffraction studies. All the four unsymmetrical dimers 1–4 exhibited stable nematic phases over a wide temperature range. Moreover, dimer 1exhibited the biaxial smectic A (SmA) phase and dimer 2 exhibited a highly ordered mesophase below the nematic (N) phase. Two rod-like and bent-core nematogenic units were covalently linked in dimers 3 and 4 to furnish exclusively the nematic phase. The observation of the biaxial SmA phase underlying the nematic phase in …