Synthesis and mesomorphic properties of 4,4”-dialkynyl-2’,3’-difluoro-p-terphenyls – the influence of C≡C acetylene linking bridge

Effect of the linking bridge type on the self-assembly behaviour of 2′,3′-difluoroterphenyl derivatives

“…The fluorinated terphenyls are promising components of ferroelectric mixtures because of low viscosity, low conductivity, and high chemical and thermal stability. 18,19 Appropriately functionalised terphenyls exhibit the following properties: nematics with negative dielectric anisotropy, 20 medium birefringence nematics, 21 smectics, 22 cholesterics, 23 ferroelectrics, 24 antiferroelectrics 15 and twist-bend nematics. 25 Our main aim is to check how the linking bridge type ('X' = -CH 2 O-or -COO-) connected to the alkyl chain of various lengths ('(CH 2 ) n ', n = 3 or 6) affects the self-assembly behaviour and the crystallization kinetics of the CH2O.3 and COO.6 compounds.…”

“…The fluorinated terphenyls are promising components of ferroelectric mixtures because of low viscosity, low conductivity, and high chemical and thermal stability. 18,19 Appropriately functionalised terphenyls exhibit the following properties: nematics with negative dielectric anisotropy, 20 medium birefringence nematics, 21 smectics, 22 cholesterics, 23 ferroelectrics, 24 antiferroelectrics 15 and twist-bend nematics. 25…”

P‐12.8: Synthesis Method for Obtaining Arylacetylenecarboxylic Acids ‐ Synthons for Liquid Crystalline Compounds

“…triple bond C ≡ C is commonly used as linking element between aromatic rings in rigid molecular core, for example phenyltolane, tolane, bistolane, biphenylbistolane, diaryldiacetylene, dinaphtylacetylene. This type of linker enables effective conjugation of π electrons system [1]. Traditionally, such structures are obtained by the Sonogashira reaction and its modifications [2].…”