Dielectric Relaxation in Low Temperature Smectic Phases of 4‐n‐Alkyloxy‐benzylidene‐amino‐4′‐cyanobiphenyls

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Abstract
The dielectric behaviour of five homologous 4‐n‐alkyloxy‐benzylidene‐amino‐4′‐cyanobiphenyls was investigated. Especially, we were interested in the dielectric relaxation frequencies of the smectic low temperature phases SB and SE as well as the dielectric behaviour in the solid state. We have found in all liquid crystalline phases a low frequency relaxation region explained by a hindered rotation of the molecules around their short axes. By supercooling of the hexyl and heptyl derivatives a new liquid crystalline phase can be obtained. A dielectric relaxation in the solid phase could not be found.