Fluorine containing nonsymmetrical five-ring achiral banana-shaped compounds with columnar and synclinic antiferroelectric layered phases

Soft Matter
C V YelamaggadQuan Li

Abstract

The phase transitional behavior of two homologous series of five-ring banana-shaped compounds comprising fluorine substituents synthesized through covalent linking of two chemically dissimilar rod-like anisometric cores (arms) to central 1,3-phenylene is reported. The novelty of these molecules originates from the fact that the molecules are highly nonsymmetrical. One of the arms, which is either salicylaldimine or Schiff base core, possesses two vicinal fluorine atoms at the terminal ring having a -decyloxy tail; while the -alkyl tail attached to the other arm was varied to realize a homologous series of compounds. The mesophases have been characterized by several complementary studies. The banana-shaped systems having short or medium alkyl chain lengths form apolar columnar (two-dimensional) structures, while on ascending the series, a polar smectic phase is stabilized. Detailed electro-optical investigations on one of the polar smectic phases revealed a synclinic antiferroelectric (racemic) ground state structure, which switches, as expected, to an anticlinic ferroelectric state by the application of an electrical field. At higher field strengths applied for an extended time interval, the anticlinic ferroelectric state switc...Continue Reading

References

Apr 24, 2002·Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics·G HeppkeH Sawade
Apr 12, 2003·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·J SzydlowskaD Guillon
Jun 29, 2004·Angewandte Chemie·Channabasaveshwar V YelamaggadSivaramakrishna Chandrasekhar
May 11, 2005·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Ewa GoreckaJozef Mieczkowski
Feb 24, 2006·Angewandte Chemie·R Amaranatha ReddyCarsten Tschierske

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Citations

Feb 15, 2017·Chemistry : a European Journal·Mohamed AlaasarCarsten Tschierske
Dec 1, 2019·Chemistry : a European Journal·Manh Linh Nguyen, Byoung-Ki Cho
Mar 17, 2012·Beilstein Journal of Organic Chemistry·Sonja Findeisen-TandelChannabasaveshwar V Yelamaggad
Dec 13, 2006·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·A JákliC V Yelamaggad

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