Dielectric and Optical Measurements for Some Compounds Exhibiting an Is-Ch-SmC* Phase Transition Sequence

Publisher Website
Google Scholar
Abstract
The Isotropic—Cholesteric—Chiral Smectic C—Crystal phase transition sequence for some terminal alkoxy derivatives of 2,2'-dihydroxybenzalazine has been studied. Dielectric and optical measurements for the compounds with n = 7, 8, 9 and 10 are reported. The low-frequency dielectric anisotropy is determined for the chiral meso-phases and the results are analysed as a function of the terminal chain length. The helical pitch values and tilt angles in the chiral smectic C phases are found to exhibit some peculiar characteristics which are qualitatively different from those of the materials undergoing the more fully studied smectic A—chiral smectic C phase transition.