New series of chiral smectic chlorinated liquid crystals

Two series of ferroelectric liquid crystalline materials, containing a late ral chlorine group on the aromatic ring of the molecular core, have been sy nthesised and investigated. Sequences of mesophases and phase transition te mperatures have been determined for all substances. The temperature depende nces of the complex permittivity and the spontaneous polarisation were dete rmined in the whole range of the ferroelectric SmC* phase. The substitution of chlorine increases the values of spontaneous polarisation more than 5 t imes in comparison with non-chlorinated compounds.