Abstract
Abstract Two members of a chiral tolane series exhibiting a new TGBA phase and a S*C ferroelectric phase have been investigated by means of electro-optical measurements. These materials belong to the optically active series of (R)-4-(1-methylheptyloxycarbonyl)-4′-(4′'- alkyloxy-3′'-fluorobenzoyloxy) tolanes and are the tetra- and octa-decyloxy derivatives. Due to the large pitch values in these TGBA mesophases, complete unwinding of the helix is found to be possible in thick cells. This also allows measurements of the electroclinic properties, such as the electric field induced tilt angle, response time, and the ferroelectric properties in the S*C phase.
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