Birefringence study of the nematic‐smectic a phase transition ofN-(4-n-pentyloxybenzylidene)-4-n-alkylaniline (50.m)

Takahashi, Masashi; Mita, Shigeru; Kondō, Shōichi

doi:10.1080/01411598708241331

Cited by 15 publications

(1 citation statement)

References 21 publications

(14 reference statements)

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“…It is observed that the I-N-SmC variant exhibited by the 11O.BA used in this work is found to agree with the reported trend of phase variants of the nO.BA series of LC compounds [3,13,23]. In the context of these reported results, the observed nematic to isotropic transition temperature (135.16 ‡C) in 11O.BA follows the expected odd-even effect (due to the alternating contributions of dipole moments with methylene group increment in the alkoxy end chain) [27][28][29]. However, this effect is found to be more pronounced at IpN (clearing) and SmpCr (melting) transitions than at the NpSmC transition.…”

Section: Resultssupporting

confidence: 90%

Influence of hydrogen bonding on phase abundance in ferroelectric liquid crystals

et al. 2004

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The synthesis and characterization of five hydrogen-bonded ferroelectric liquid crystal complexes (HBFLCs) prepared from mesogenic p-n-alkoxy benzoic acids and non-mesogenic propionic/butyric acids with different chiral centres are reported. Complementary intermolecular hydrogen bonding is confirmed through IR study. HBFLCs are found to exhibit chiral nematic (N*), smectic C* (SmC*) and smectic G* (monotropic) phases in their cooling profiles during polarizing thermal microscopy and differential scanning calorimetry. Phase coexistence regions are observed above the IN* transition. The chiral nematic to smectic C* transition is found to be of first order. The temperature variation of spontaneous polarization exhibited by these HBFLC complexes in their SmC* phase is presented. The effect of non-covalent interaction imparted by the soft hydrogen bonding in these LC complexes on enhanced or induced thermal stability of tilted LC phases is discussed.

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Section: Resultssupporting

confidence: 90%