Synthesis and characterization of azo liquid crystal compounds based on 5H-Thiazolo [3,4-b][1,3,4]thiadiazole unit

Jabar, Maha A.; Karam, Nisreen H.

doi:10.21931/rb/2022.07.02.17

Cited by 2 publications

(2 citation statements)

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“…In the course of researching heterocyclic liquid crystal derivatives, various thermotropic liquid crystals with heterocyclic units have been created over a long period of time. [5,6] In line with our investigation of heterocyclic unit-containing derivatives of liquid crystals, various thermotropic liquid crystals with heterocyclic units have been created over a long period of time. [7][8][9].…”

Section: Introductionmentioning

confidence: 97%

Design of New V Shaped Thermotropic Liquid Crystals containing Heterocyclic

Ali

Karam

2023

IHJPAS

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The characterization and design of this study of new liquid crystals with a V shape compounds containing thiazolidine-2,4-dione and 1,3-phenylene as a core unite with mesophase properties were reported. Preparation and characterization of chloroacetic acid, water, and thiourea to produce thiazolidine-2,4-dione [I] in the presence of strong hydrochloric acid. The 4-hydreoxybenzaldehyde and n-alkyl bromide were reacted with potassium hydroxide to create the n-alkoxy benzaldehyde., then the compound [I] reacted with [II]n in presence of piperidine to produce compounds [III]n. Also, converted resorcinol to a corresponding compound [IV] by refluxing pyridine and DMF with two moles of chloracetyl chloride, after that interacted the compounds [III]n and compound [IV] with sodium acetate to form compounds [V]n. FT-IR and 1HNMR spectroscopy were really used to determine the structures of the produced substances. Using polarized optical microscopy, these mesogens' mesomorphic characteristics were studied (POM).The synthesized molecules exhibited enantiotropic liquid crystal phases, the substances [V]1-4 exhibited an only the enantiotropic nematic phase.

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Section: Introductionmentioning

confidence: 97%

Design of New V Shaped Thermotropic Liquid Crystals containing Heterocyclic

Ali

Karam

2023

IHJPAS

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“…General structure of calamitic LC molecules can be described as a combination of relatively rigid parts, typically aromatic cores with/without linking groups, with flexible parts, usually represented by terminal alkyl chains [9]. Heterocyclic composites are a significant class of the organic chemicals with numerous scientific uses, and particularly five-membered heterocyclic ring-containing liquid crystalline substances have been effectively tested [10][11][12]. The hunt for new heterocyclic compounds has recently focused on several significant groups, including thiazolidine-2,4-dione.…”

Section: Introductionmentioning

confidence: 99%

Untitled

2023

J. Med. Chem. Sci.

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This research includes the synthesis, characterization, and investigation of liquid crystalline properties of new rod-shaped liquid crystal compounds 1,4phenylene bis(2-(5-(four-alkoxybenzylidene)-2,4-dioxothiazolidin-3yl)acetate), prepared thiazolidine-2,4-dione (I) by the thiourea reaction with chloroacetic acid and water in the presence of the concentrated hydrochloric acid. The n-alkoxy benzaldehyde (II)n synthesized from the reacted 4hydreoxybenzaldehyde and n-alkyl bromide with potassium hydroxide, and then the compound (I) was reacted with (II)n in the presence of piperidine to produce compounds (III)n. Also, hydroquinone was converted into a corresponding compound (IV) by refluxing with two moles of chloracetyl chloride in pyridine and DMF. After that, the compounds (III)n was interacted with sodium acetate to form compounds (V)n. FT-IR and 1 H-NMR spectroscopy were really used to determine the structures of the produced substances. By using the polarized optical microscopy, these mesogens' mesomorphic characteristics were studied (POM). The produced compounds displayed enantiotropic liquid crystal phases, while the substances (V)6-8 displayed a smectic enantiotropy in a variation on the nematic phases.

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Synthesis and characterization of azo liquid crystal compounds based on 5H-Thiazolo [3,4-b][1,3,4]thiadiazole unit

Cited by 2 publications

References 29 publications

Design of New V Shaped Thermotropic Liquid Crystals containing Heterocyclic

Design of New V Shaped Thermotropic Liquid Crystals containing Heterocyclic

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