Studies of intermolecular proton transfer, its influence on the liquid crystal properties and electrically-driven transport of chiral ions in mixtures of chiral liquid crystalline 4-phenylpyridine derivative and organic acids of various strength

2021 ◽  
pp. 116455
Author(s):  
Lukasz Duda ◽  
Bartlomiej Potaniec ◽  
Maciej Czajkowski ◽  
Marta Fiedot-Tobola ◽  
Marcin Palewicz ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Proton Transfer ◽  
Organic Acids ◽  
Liquid Crystalline ◽  
Intermolecular Proton Transfer ◽  
Crystal Properties

scholarly journals The use of isoxazoline and isoxazole scaffolding in the design of novel thiourea and amide liquid-crystalline compounds

2020 ◽  
Vol 16 ◽  
pp. 175-184 ◽  
Author(s):  
Itamar L Gonçalves ◽  
Rafaela R da Rosa ◽  
Vera L Eifler-Lima ◽  
Aloir A Merlo
Keyword(s):  
Liquid Crystal ◽  
Relative Position ◽  
Liquid Crystalline ◽  
Condensation Reaction ◽  
Ammonium Thiocyanate ◽  
The Other ◽  
Amide Derivatives ◽  
Crystal Properties ◽  
Benzoyl Chlorides ◽  
Membered Heterocycle

A series of novel thiourea and amide liquid crystals containing 5-membered isoxazoline and isoxazole rings were synthetized and the liquid crystal properties studied. Thioureas were obtained using a condensation reaction of benzoyl chlorides, arylamines and ammonium thiocyanate. The amides, on the other hand, were the byproduct of a quantitative reaction which used potassium cyanate as the starting material. Thiourea and amide derivatives were predominantly SmA mesophase inductors. A nematic mesophase was observed only for thioureas and amides containing an isoxazole ring. Additionaly, the liquid crystal behavior was also dependent on the relative position of nitrogen and oxygen atoms on the 5-membered heterocycle.

scholarly journals An unsymmetrical porphyrin and its metal complexes: Synthesis, spectroscopy, thermal analysis and liquid crystal properties

2009 ◽  
Vol 74 (10) ◽  
pp. 1097-1104 ◽  
Author(s):  
Changfu Zhuang ◽  
Xuexin Tang ◽  
Dong Wang ◽  
Aiqing Xia ◽  
Wenhui Lian ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Liquid Crystalline ◽  
Thermal Studies ◽  
Luminescent Properties ◽  
Quantum Yields ◽  
Scanning Calorimetry ◽  
Crystal Properties

The synthesis and characterization of a new unsymmetrical porphyrin liquid crystal, 5-(4-stearoyloxyphenyl)phenyl-10,15,20-triphenylporphyrin (SPTPPH2) and its transition metal complexes (SPTPPM, M(II) = Zn, Fe, Co, Ni, Cu or Mn) are reported. Their structure and properties were studied by elemental analysis, and UV-Vis, IR, mass and 1H-HMR spectroscopy. Their luminescent properties were studied by excitation and emission spectroscopy. The quantum yields of the S1 ? S0 fluorescence were measured at room temperature. According to thermal studies, the complexes have a higher thermal stability (no decomposition until 200?C). Differential scanning calorimetry (DSC) data and an optical textural photograph, obtained using a polarizing microscope (POM), indicate that the porphyrin ligand had liquid crystalline character and that it exhibited more than one mesophase and a low-lying phase transition temperature, with transition temperatures of 19.3 and 79.4?C; the temperature range of the liquid crystal (LC) phase of the ligand was 70.1?C.

scholarly journals Preparation and Aggregation-Induced Emission of New 1,3,5-Triazine-2,4,6-tricarboxamide with Liquid Crystal Properties

2018 ◽  
Vol 34 (4) ◽  
pp. 1741-1748 ◽  
Author(s):  
ABDULHAMID UMAR ◽  
MUSTAFFA SHAMSUDDIN
Keyword(s):  
Liquid Crystal ◽  
Solid State ◽  
Liquid Crystalline ◽  
Crystalline Material ◽  
Aggregation Induced Emission ◽  
Liquid Crystal Material ◽  
Crystal Properties ◽  
Thermal Data ◽  
Active Liquid ◽  
Liquid Crystalline Material

The combination of aggregation-induced emission (AIE) and liquid crystal properties generates solid-state efficient luminescent liquid crystal materials. Here in, we reported the synthesis of 1,3,5-triazine-2,4,6-tricarboxamide and utilized it as a supramolecular organic motif for the AIE-active liquid crystal material. The compound exhibits high-intensity emission maxima at 417 and 468 nm in the solid state with excitation at 254 nm, whereas it shows weak emission in the solution phase. Also, this compound behaves as liquid crystalline material and shows columnar hexagonal mesophase with endothermic peaks at 73.4oC, 185.6oC, and exothermic peaks were observed at 181.9oC and 66.1oC with focal conic fan shape texture. The thermal data showed that the compound is stable up to 200oC.

scholarly journals Sandwich organization of non-ionic surfactant liquid crystalline phases as induced by large inorganic K4Nb6O17 nanosheets

2016 ◽  
Vol 52 (8) ◽  
pp. 1594-1597 ◽  
Author(s):  
R. Guégan ◽  
K. Sueyoshi ◽  
S. Anraku ◽  
S. Yamamoto ◽  
N. Miyamoto
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystalline ◽  
Nonionic Surfactants ◽  
Ionic Surfactant ◽  
Crystalline Phases ◽  
Liquid Crystalline Phases ◽  
Crystal Properties

While retaining its liquid crystal properties, niobate nanosheets were used to sandwich a lamellar monodomain made up of nonionic surfactants and water.

Solvent-dependent gelation behaviour and liquid crystal properties of a bent-core dihydrazide derivative

2017 ◽  
Vol 41 (17) ◽  
pp. 9482-9488 ◽  
Author(s):  
Chunxue Zhang ◽  
Xiangyang Che ◽  
Tianren Zhang ◽  
Binglian Bai ◽  
Haitao Wang ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Elastic Property ◽  
Liquid Crystalline ◽  
Polar Liquid ◽  
Crystal Properties ◽  
Liquid Crystalline Gel

Both liquid crystalline gel and crystalline gel are obtained by changing the solvent from non-polar to polar. Liquid crystalline gels exhibit better elastic property over crystalline gel from EtOH. And their corresponding xerogels show distinct mesophase behaviour.

scholarly journals Synthesis and Determination of Thermotropic Liquid Crystalline Behavior of Cinnamaldehyde-Based Molecules with Two Schiff Base Linking Units

Molecules ◽  
2020 ◽  
Vol 25 (17) ◽  
pp. 3780
Author(s):  
Zuhair Jamain ◽  
Nor Faizawani Omar ◽  
Melati Khairuddean
Keyword(s):  
Schiff Base ◽  
Liquid Crystal ◽  
Nematic Phase ◽  
Liquid Crystalline ◽  
Condensation Reaction ◽  
Structure Property ◽  
Scanning Calorimetry ◽  
Crystal Properties ◽  
Structure Property Relationship

A series of liquid crystal molecules with two Schiff base linking units and a cinnamaldehyde core with different terminal groups were synthesized and characterized. The intermediates of 4-heptyloxybenzaldehyde (1a) and 4-dodeyloxybenzaldehyde (1b) were synthesized through the alkylation of 4-hydroxybenzaldehyde with a series of bromoalkane. A condensation reaction of cinnamaldehyde, 1,4-phenylenediamine and a series of substituted benzaldehydes with different terminal groups such as bromo, chloro, hydroxy, cinnamaldehyde, hydrogen, methoxy, heptyloxy and dodecyloxy produced a series of new cinnamaldehyde-based compounds, 2–9, respectively. All these compounds were characterized using Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (NMR) spectroscopy, and CHN elemental analysis. The liquid crystal properties of these compounds were determined using polarized optical microscopy (POM), and their transitions were further confirmed using differential scanning calorimetry (DSC). Compounds with chloro, bromo, methoxy, heptyloxy, and dodecyloxy substituents are mesogenic compounds with nematic phase behavior. However, the other compounds were found to be non-mesogenic without any mesophase transitions. The structure–property relationship was investigated in order to study the effect of different terminal groups and Schiff base linking units on the liquid crystalline behavior of these compounds.

Synthesis and Properties of Novel Thiophene-Based Liquid Crystalline Conducting Polymers

2017 ◽  
Vol 25 (9) ◽  
pp. 669-676 ◽  
Author(s):  
Danesh Roudini
Keyword(s):  
Magnetic Field ◽  
Differential Scanning Calorimetry ◽  
Liquid Crystal ◽  
Optical Microscopy ◽  
Electronic Properties ◽  
Liquid Crystalline ◽  
Side Chain ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Crystal Properties

Side-chain liquid crystalline polythiophenes were synthesised and the effects of the mesogenic units on the structure and electronic properties of the polymers were studied. The liquid crystal properties of the polymer films were studied using polarised hot-stage optical microscopy and differential scanning calorimetry, and X-ray diffractometry was used to investigate the effect of a magnetic field on the monomers and polymers.

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