Synthesis, Mesomorphic Properties and Application of (R,S)-1-Methylpentyl 4′-Hydroxybiphenyl-4-carboxylate Derivatives

Thirteen new liquid crystalline racemic mixtures were synthesized and investigated. For these racemic mixtures, the phase sequences and their changes were determined by polarizing optical microscopy (POM). The phase transition temperatures and transition enthalpies were checked by differential scanning calorimetry (DSC). All new racemates have an anticlinic smectic C-A phase in a broad temperature range. Three highly tilted antiferroelectric mixtures were doped with six racemates at a concentration of 20% by weight. The helical pitch of the prepared mixtures was measured by the spectrophotometry method. All doped mixtures have a longer helical pitch than the base mixtures.

Automated summary

Thirteen new liquid crystalline racemic mixtures were synthesized and studied. The phase sequences, phase transition temperatures, and transition enthalpies of these mixtures were determined by POM and DSC. The results showed that all the new racemates have an anticlinic smectic C-A phase in a broad temperature range, and doping with racemates can increase the helical pitch of highly tilted antiferroelectric mixtures.