2312-15-4Relevant articles and documents
Synthesis and liquid crystalline properties of new triazine-based π-conjugated macromolecules with chiral side groups
Akkurt, Nihat,Al-Jumaili, Mohammed Hadi Ali,C?kar, Fatih,Ocak, Hale,Torun, Lokman
, p. 726 - 735 (2020)
In this study, we reported the synthesis of a new tribranched macromolecule liquid crystal with triazine in the centre. The central triazine core is bonded via sequences of Sonigashira coupling to 3 triazine unites through acetylenic bridges. The triazines at the periphery are substituted with 2 chiral citronellyloxy side groups. The salt of the resulting star-shaped macromolecule, which was oily at room temperature, with 4-dodecyloxybenzoic acid at 1:1 ratio exhibited a Smectic C (SmC) mesophase. The liquid crystalline properties of organic salt were investigated using DSC (differential scanning calorimetry) and POM (polarizing optical microscopy).
Ionic interaction of tri-armed structure based on benzene ring: synthesis and characterization
Al-Jumaili, Mohammed Hadi Ali,Akkurt, Nihat,Torun, Lokman
, p. 551 - 558 (2021)
Abstract: Liquid crystalline is a state of matter which combines the properties of liquid and a crystalline solid. Ionic liquid crystals are a new class of materials which exhibit phase transition at low temperature. A new structure was synthesized based on a benzene ring carrying three armed, two arms of triazine ring and the third arm is phenoxy benzene. The presence of alkyl chain groups on the periphery reduced the mesophase transitions which are desirable for low-temperature applications of liquid crystals. The substitution was achieved efficiently by Sonogashira coupling. The tri-armed compound was synthesized successfully through cross-coupling. However, it was oily and no transition phase was observed. Therefore, to increase the liquid crystal possibility, the compound was mixed with 4-(dodecyloxy)benzoic acid (4-DBA) with 1:1 ratio to produce an organic salt through hydrogen bonding. The organic salt obtained by ionic interaction between the tri-armed compound and 4-DBA exhibited a phase transition at low temperature. However, ionic liquid crystals are important class of mesomorphic materials and have considered as sealants due to their very low vapour pressure which demonstrated a proficient electrolyte systems for their anisotropic phase such as high ionic conductivity and diffusion along with excellent thermal stability. All the intermediate compounds and final compounds were confirmed by spectroscopic techniques (1H NMR, 13C NMR, FT-IR, and HRMS). Graphic abstract: [Figure not available: see fulltext.].
Naphthoyl hydrazine organic gel factor as well as preparation method and application thereof
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Paragraph 0062; 0066-0067, (2021/11/06)
The invention relates to a naphthoyl hydrazine organic gel factor and a preparation method and application thereof. Where n is-18; wherein n is-18. The alkoxy benzoic acid and the condensation agent are mixed into a mixed solution, naphthalene carbonylhydrazide is added and the condensation reaction is carried out, and the alkoxy benzoic acid and the condensation agent are subjected to condensation reaction and can be prepared by separation and purification. The organic gel factor is mixed with an organic solvent, is heated and dissolved in a sealed state, and after cooling, an organic gel with fluorine ion responsiveness can be obtained. Compared with the prior art, the preparation method has the advantages of simple preparation process, mild reaction conditions, good gel ability for various organic solvents such as methanol and ethanol, and the like. The fluorinion has a remarkable specific response to fluoride ions in a gel state, and shows a remarkable advantage in the aspect of fluorine ion detection.
Synthesis and Characterization of New 1,3,5 -Triazine Derivatives Based on Benzene Ring
Shallal, Muhammed Abdalhasan,Hussien, Hyffaa Y.
, p. 7201 - 7208 (2021/11/16)
Liquid crystal materials have a number of ordinary uniqueness such as mechanical or electro-optical properties. New triazines derivatives compound was obtained starting from 1,3,5-triazine and 1,3,5-trichlorobenzene. The synthesized compound consists of three-armed, one arm of phenol and two armed of 2,4-bis-(dode-cyloxy)-6- ethynyltriazine that built up via reaction of triazine with dodecan-1-ol. The substitution was achieved efficiently at appropriate temperature under the argon atmosphere by cross coupling. However, the two armed of 2,4- bis(dodecyloxy)ethynyltriazine on the periphery are considered for liquid crystal application. The target compound did not exhibit a transition phase in its pure state but, after ionic interaction with 4-DBA which already possess a phase transition, it showed a phase transition and liquid crystal properties. We study the liquid crystal properties of obtained organic salts after ionic interaction through hydrogen bonding via methods of OPM "optical polarizing microscope"and DSC "differential calorimetric scanning). After purification with column chromatography then confirmed their structures by analysis of spectroscopy (MS, NMR, and FT-IR).
