scholarly journals Triphenylamine- and triazine-containing hydrogen bonded complexes: liquid crystalline supramolecular semiconductors

2021 ◽  
Author(s):  
Beatriz Feringán ◽  
Roberto Termine ◽  
Attilio Golemme ◽  
Jose M. Granadino-Roldan ◽  
Amparo Navarro ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Charge Transport ◽  
Transport Properties ◽  
Liquid Crystalline ◽  
Crystal Phase ◽  
Liquid Crystal Phase ◽  
Hole Transporting ◽  
Hole Transporting Materials ◽  
Bonded Complexes ◽  
Hydrogen Bonded

Despite the fact that triphenylamine derivatives have been widely explored as hole-transporting materials, studies on charge transport properties in the liquid crystal phase have been overlooked. Here, it is reported...

A Columnar Liquid-Crystal Phase Formed by Hydrogen-Bonded Perylene Bisimide J-Aggregates

2017 ◽  
Vol 129 (8) ◽  
pp. 2194-2197 ◽  
Author(s):  
Stefanie Herbst ◽  
Bartolome Soberats ◽  
Pawaret Leowanawat ◽  
Matthias Lehmann ◽  
Frank Würthner
Keyword(s):  
Liquid Crystal ◽  
Crystal Phase ◽  
Liquid Crystal Phase ◽  
Perylene Bisimide ◽  
J Aggregates ◽  
Hydrogen Bonded

Synthesis and Characterization of Terthiophene-Based Rod-Like Liquid Crystals

2012 ◽  
Vol 532-533 ◽  
pp. 61-65
Author(s):  
Xiao Hui Liu ◽  
Zhong Xiao Li ◽  
Song Ya Zhang ◽  
Jia Ling Pu
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystalline ◽  
Crystal Phase ◽  
Liquid Crystal Phase ◽  
Schiff’S Base ◽  
Thermally Induced ◽  
H Nmr ◽  
Clearing Point ◽  
Temperature Ranges

With 2,2',5',2''-Terthiophene as starting material, two liquid crystalline compounds containing Schiff’s base unit were synthesized in this paper. The structure of the compounds was confirmed by FTIR and 1H NMR. The thermally induced phase transition behaviors were investigated by POM and DSC, and the temperature ranges of liquid crystal phase of the two compounds were compared. Results showed that the symmetric compound exhibited a lower clearing point temperature and broader temperature range of liquid crystal phase.

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.

scholarly journals Light absorption and hole-transport properties of copper corroles: from aggregates to a liquid crystal mesophase

2015 ◽  
Vol 39 (9) ◽  
pp. 7140-7146 ◽  
Author(s):  
Di Gao ◽  
Judicaelle Andeme Edzang ◽  
Abdou Karim Diallo ◽  
Thibault Dutronc ◽  
Teodor Silviu Balaban ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Transport Properties ◽  
Light Absorption ◽  
Room Temperature ◽  
Hole Transport ◽  
Crystal Phase ◽  
Liquid Crystal Phase

A room temperature corrole-based liquid crystal phase is described, fully characterized and compared to assemblies produced by simpler corrole derivatives.

Interplay Between the Crystal and Liquid Crystalline Ordering of iPP and Carbon Nanotube Composites under Melt-Shear

2011 ◽  
Vol 1308 ◽  
Author(s):  
Georgi Georgiev ◽  
Michael B. McIntyre ◽  
Robert Judith ◽  
Erin A. Gombos ◽  
Peggy Cebe
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystalline ◽  
Smectic Phase ◽  
Crystal Phase ◽  
Sudden Increase ◽  
Two Dimensional ◽  
Liquid Crystal Phase ◽  
Smectic Liquid Crystal ◽  
Polarized Microscopy ◽  
Nanotube Composites

ABSTRACTCarbon nanotubes (CNTs) exhibit liquid crystalline order and their nematic director couples to the one of low molecular weight liquid crystals. Here we explore the interactions between CNTs and the smectic liquid crystal phase of a polymer and the possibility for a similar coupling in this system. Isotactic Polypropylene (iPP) and iPP/CNTs nanocomposites were made in solution with varying CNT concentrations and hot pressed into 50-100μm thick films. The pure iPP and iPP/CNT films were then sheared at one rotation per second in the melt state. Shearing continued as the temperature was decreased from 200°C to 145°C to induce a smectic liquid crystal phase. The sheared samples were analyzed using polarized optical microscopy, Two Dimensional Microscopic Transmission Ellipsometry (2D-MTE) and Two Dimensional Wide Angle X-Ray Scattering (2D-WAXS). During shearing we detected a sudden increase of birefringence at 151°C in the samples, higher than the iPP crystallization temperature, indicating liquid crystalline ordering. The samples were then crystallized at 135°C for 30 minutes. We measured anisotropic 2D-WAXS patterns of the samples that contained CNTs, indicating strong ordering of the crystals. Upon reheating, we measured birefringence at temperatures higher than the melting endotherm for the iPP crystals, using polarized microscopy, which indicates that some smectic order still persists in the samples, even after crystallization and complete melting of all crystals. Our results indicate that CNTs couple to the smectic phase of iPP, improve its order upon shearing and the crystals created after the formation of the oriented smectic phase are strongly aligned parallel to the direction of shearing.

A Columnar Liquid-Crystal Phase Formed by Hydrogen-Bonded Perylene Bisimide J-Aggregates

2017 ◽  
Vol 56 (8) ◽  
pp. 2162-2165 ◽  
Author(s):  
Stefanie Herbst ◽  
Bartolome Soberats ◽  
Pawaret Leowanawat ◽  
Matthias Lehmann ◽  
Frank Würthner
Keyword(s):  
Liquid Crystal ◽  
Crystal Phase ◽  
Liquid Crystal Phase ◽  
Perylene Bisimide ◽  
J Aggregates ◽  
Hydrogen Bonded
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