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The synthesis and characterization of a series of new symmetrical 4,4’-biphenyl derivatives carrying a hydro or perfluoroalkyl chain via, ethyl-3-thiopropoxy linker are described. The mesomorphic properties were studied using differential scanning calorimetry and polarizing optical microscopy techniques. It has been found that compounds having longer fluoroalkyl chain exhibit higher transition temperatures. Only compounds with fluoroalkyl segment exhibit smectic phases.

Synthesis and mesomorphic properties of 4,4'-bis[F-alkylethyl-3-thiopropoxy]biphenyl