Synthesis and properties of antiferroelectric and/or ferroelectric compounds with the –CH2O group close to chirality centre

Magdalena Urbańska, Paweł Perkowski, Mateusz Szala
2019 Figshare  
Novel chiral three-ring compounds with the –CH2O group close to chirality centre were synthesised and their properties were studied. The phase transitions and phase sequences were observed using a polarising optical microscope. The phase transition temperatures and enthalpies were checked by differential scanning calorimetry. A broad-frequency dielectric spectroscopy was also used to confirm the phase transition temperatures as well as the phase sequence. The helical pitch was measured by the
more » ... s measured by the spectrophotometry method. It was found that the compounds differing only in one lateral substituted fluorine atom create two different chiral tilted smectic phases, one a ferroelectric phase (SmC*) and the other an antiferroelectric phase (SmCA*).
doi:10.6084/m9.figshare.8266766.v3 fatcat:ls2225fzgrfy7d6mghrskwyt34