The dependence of the spontaneous polarization on the molecular structure

The spontaneous polarization Ps of homologous liquid crystalline thiadiazole derivatives was investigated. By elongation of the alkyloxy group attached near to the asymmetric carbon atom Ps increases from the methoxy to the hexyloxy derivative and decreases by further extension of the alkyloxy part. By chemical variation of the polarity and the molecular shape we demonstrate the importance of the steric relations for Ps.