Liquid-crystalline polymorphism of 4-heptyloxybenzylidene-4′-alkyloxyanilines and their phase equilibrium with 4-octyloxyphenyl 4-nitrobenzoate

► New liquid crystalline series 4-heptyloxybenzylidene-4′-alkyloxyanilines. ► Phase transitions, change of entropies and types of mesophases are discussed. ► Phase diagram technique was applied to mesophase identification. ► Induce of SmA mesophase in mixtures with 4-octyloxyphenyl 4-nitrobenzoate.