Structure and molecular packing in smectic BCr and Ad phases of Schiff base liquid crystal compounds through the analyses of layer spacing, entropy and crystal structure

2017 ◽  
Vol 19 (29) ◽  
pp. 19434-19441 ◽  
Author(s):  
Yasuhisa Yamamura ◽  
Takahito Murakoshi ◽  
Sakiko Iwagaki ◽  
Natalia Osiecka ◽  
Hideki Saitoh ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Schiff Base ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Chain Length ◽  
Molecular Packing ◽  
Smectic Liquid Crystals ◽  
Layer Spacing ◽  
Alkyl Chains ◽  
Base Liquid

Chain-length dependence of layer spacing reveals the packing of molten alkyl chains in smectic liquid crystals.

Examination of molecular packing in orthogonal smectic liquid crystal phases: a guide for molecular design of functional smectic phases

2017 ◽  
Vol 19 (37) ◽  
pp. 25518-25526 ◽  
Author(s):  
Yasuhisa Yamamura ◽  
Takahito Murakoshi ◽  
Mafumi Hishida ◽  
Kazuya Saito
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Chain Length ◽  
Molecular Design ◽  
Molecular Packing ◽  
Smectic Liquid Crystals ◽  
Alkyl Chains ◽  
Smectic Liquid Crystal ◽  
Smectic Phases ◽  
Crystal Phases

Two modes of packing of molten alkyl chains in smectic liquid crystals are revealed through analyzing the chain-length dependence of layer spacings.

scholarly journals Polar Alkoxy Group and Pyridyl Effects on the Mesomorphic Behavior of New Non-Symmetrical Schiff Base Liquid Crystals

Symmetry ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1832
Author(s):  
Sayed Z. Mohammady ◽  
Daifallah M. Aldhayan ◽  
Mohammed A. Alshammri ◽  
Ayoub K. Alshammari ◽  
Mohammed Alazmi ◽  
...  
Keyword(s):  
Schiff Base ◽  
Liquid Crystals ◽  
Chain Length ◽  
Density Functional ◽  
Theoretical Calculations ◽  
13C Nmr Spectroscopy ◽  
Alkoxy Group ◽  
Thermal Stabilities ◽  
New Compounds ◽  
Base Liquid

A series of non-symmetrical Schiff base liquid crystals were prepared and investigated. Schiff bases of p-alkyloxy aniline derivatives and 4-phenyl pyridine-4′-carbaldehyde were synthesized. The terminal alkoxy groups substituting aniline are of varied chain length, namely C6, C8, and C16. The structures of the compounds were confirmed via 1H NMR and 13C NMR spectroscopy. Different mesophases of the samples were thermally and optically characterized by differential thermal analysis (DSC) and polarized optical microscopy (POM). All samples revealed enantiotropic smectic B (SmB) and smectic A (SmA) mesophases. The results obtained were further correlated with the density functional theory (DFT) theoretical calculations. The results are compared to a series of compounds bearing biphenyl moiety in their mesogens. The thermal stabilities of the different mesophase reduced upon the increment of the alkoxy chain length. The temperature ranges of both the smectic mesophases of new compounds bearing the 4-phenyl pyridine moiety are generally expanded higher than the other series. In addition, the total mesophase range is greater in the new compounds when compared to their biphenyl analogues. The DFT results were investigated in terms of the molecular geometries and the frontier molecular orbitals as well as the charge distribution mapping to show and illustrate the difference in the mesomorphic properties.

Shear flow simulations of smectic liquid crystals based on the Gay–Berne fluid and the soft sphere string-fluid

2019 ◽  
Vol 21 (1) ◽  
pp. 292-305 ◽  
Author(s):  
Sten Sarman ◽  
Yong-Lei Wang ◽  
Aatto Laaksonen
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Shear Flow ◽  
Smectic Liquid Crystals ◽  
Soft Sphere ◽  
Flow Simulations ◽  
Smectic Liquid Crystal

Smectic liquid crystal undergoing shear flow.

Antiferroelectric Liquid Crystals from Achiral Molecules And A Liquid Conglomerate

1999 ◽  
Vol 559 ◽  
Author(s):  
David M. Walba ◽  
Eva Körblova ◽  
Renfan Shao ◽  
Joseph E. Maclennan ◽  
Darren R. Link ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Liquid Crystalline ◽  
Crystal Phase ◽  
Liquid Crystal Phase ◽  
Crystalline Structures ◽  
Chiral Liquid Crystal ◽  
Antiferroelectric Liquid Crystals ◽  
Liquid Crystal Structure

ABSTRACTUntil recently, it was an empirical fact that creation of a chiral liquid crystal phase required enantiomerically enriched molecules. In addition, to date known ferroelectric and antiferroelectric smectics have also been composed of enantiomerically enriched molecules. Herein are described the first examples of the formation of chiral and antiferroelectric supermolecular liquid crystalline structures from achiral molecules. In one case (apparently metastable) the liquid crystal structure is macroscopically chiral, with samples composed of heterochiral macroscopic domains: a liquid conglomerate.

New two rings Schiff base liquid crystals; ball mill synthesis, mesomorphic, Hammett and DFT studies

2020 ◽  
Vol 299 ◽  
pp. 112161 ◽  
Author(s):  
Sherif S. Nafee ◽  
Mohamed Hagar ◽  
Hoda A. Ahmed ◽  
O.A. Alhaddad ◽  
Reda M. El-Shishtawy ◽  
...  
Keyword(s):  
Schiff Base ◽  
Liquid Crystals ◽  
Ball Mill ◽  
Dft Studies ◽  
Base Liquid

scholarly journals New wide-stability four-ring azo/ester/Schiff base liquid crystals: synthesis, mesomorphic, photophysical, and DFT approaches

RSC Advances ◽  
2020 ◽  
Vol 10 (16) ◽  
pp. 9643-9656 ◽  
Author(s):  
Nagwa H. S. Ahmed ◽  
Gamal R. Saad ◽  
Hoda. A. Ahmed ◽  
Mohamed Hagar
Keyword(s):  
Schiff Base ◽  
Liquid Crystals ◽  
Base Liquid ◽  
Dsc Thermograms

DSC thermograms of some prepared compounds: (a) recorded from second heating and (b) from cooling at a rate of ±10 °C min−1.

Influence of meta-extended rigid-core, complementary hydrogen bonding and flexible chain on polymorphism in Schiff-base liquid crystals: (4)MeOBD(3)AmBA:nOBAs

2019 ◽  
Vol 47 (4) ◽  
pp. 582-603
Author(s):  
AVSN Krishna Murthy ◽  
M. Srinivasulu ◽  
AVN Ashok Kumar ◽  
YV Rao ◽  
DM Potukuchi
Keyword(s):  
Hydrogen Bonding ◽  
Schiff Base ◽  
Liquid Crystals ◽  
Rigid Core ◽  
Flexible Chain ◽  
Base Liquid
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