Abstract
Some chiral series with benzoate cores (CnHH, CnF3 and CnF2) are reported. These series (hydrogenous, monofluoro-substituted in positions 2 and 3 of the first phenyl ring near the chiral chain) display very rich polymorphism, including SmC*, SmC*α, SmC*FI1, SmC*FI2 and SmC*A phases. Based on the theoretical Hammaneh–Taylor model, we analyze phase diagrams and physical properties, including spontaneous polarization, transverse dipole moment and torsion of the studied compounds. This description offers an insight into the factors that affect the stability of the intermediate smectic phases. The effect of fluoro substitution on the visco-elastic properties is investigated.
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