Abstract
The investigated optically active dimeric compound,4-n-undecyloxy-4′-(cholesteryloxycarbonyl-1-butyloxy)chalcone, shows wide temperatureranges of two twist grain boundary (TGB) phases, TGBA andTGBC*. Comprehensive dielectric studies have been carried out for this compound in thefrequency range 1 Hz–10 MHz for different conditions of molecular anchoring. Thiscompound shows negative dielectric anisotropy (). Various electrical parameters, namely the dielectric permittivity, dielectricanisotropy, DC conductivity and activation energy, have been determined for theseTGB phases. Weak relaxation processes have been detected in the TGBA andTGBC* phases, presumably due to amplitude (soft mode) and phase (Goldstone mode)fluctuations.
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