Synthesis and characterization of biphenyl-based azo liquid crystals and its optical properties: effect of lateral and tail group

Thakor, Akshay; Dwivedi, Durgesh J.; Desai, V. B.; Jadeja, U. H.; Sharma, Vinay S.; Patel, R. B.

doi:10.1080/15421406.2021.1933685

Cited by 8 publications

(3 citation statements)

References 34 publications

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“…The esterification reaction to protect the acid group of p‐amino benzoic acid was carried out by using ethanol and concentrated H 2 SO 4 to convert ethyl 4‐amino benzoate (A) in 80 % yield [35] . In the second step, the diazotization reaction is performed on compound ( A ) with resorcinol by using NaNO 2 , HCl, and NaOH in an ice bath [36] . The mass volume of the reaction was vigorously mixed for 2 h. At that point, the azo dye product ( B ) conformed by using starch iodide and congo red paper.…”

Section: Resultsmentioning

confidence: 99%

“…[35] In the second step, the diazotization reaction is performed on compound (A) with resorcinol by using NaNO 2 , HCl, and NaOH in an ice bath. [36] The mass volume of the reaction was vigorously mixed for 2 h. At that point, the azo dye product (B) conformed by using starch iodide and congo red paper. Further, the alkylation of compound (B) is carried out by the using acetone and alkyl bromides and K 2 CO 3 to convert di-alkoxy phenyl compounds (C 1 -C 4 ) in higher yields.…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

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Thiacalixarene Appended Azo‐based Supramolecular Systems: Self‐assembly and Photo Tuning Reversible Liquid Crystalline Properties

et al. 2023

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Four new azo‐based supramolecular materials containing thiacalixarene core substituted by variable alkoxy groups (TFA1–TFA4) have been designed and synthesized for the mesomorphic and photoswitching properties. The liquid crystalline behavior were accomplished by using DSC, POM, and XRD studies. All azo‐based thiacalixarene based materials with short and higher chain length display columnar hexagonal mesophase with broad temperature range. The thermal behavior of all the materials was investigated by DSC and TGA study. The structural and conformational study of the lower rim functionalized materials was confirmed by using different techniques. These thiacalixarene moulded liquid crystalline compounds shows columnar self‐assembly type behavior and higher thermal stability. The introduction of bi‐substituted azo‐ester network towards the lower rim of thiacalixarene core has impact on the electron delocalization and liquid crystalline properties. The photoswitching properties suggested cis and trans azo‐isomerization under radiation of UV light and higher thermal back relaxation time. The mesogenic behaviour of compound TFA2 and TFA4 were demolished by the influence of cis and trans isomerization. The structure‐property correlation is studied to understand the variation in mesogenic properties with the substitution of variable alkoxy side chain.

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Section: Resultsmentioning

confidence: 99%

Section: Synthesis and Characterizationmentioning

confidence: 99%

Thiacalixarene Appended Azo‐based Supramolecular Systems: Self‐assembly and Photo Tuning Reversible Liquid Crystalline Properties

et al. 2023

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“…Finally, targeted compounds have been prepared by esterification of sulfanilamide (1 mmol) with 4-n-alkoxy cinnamic acid derivatives (B1-B4) (1.2 mmol) in presence of DCC (2.2 mmol) and DMAP (0.05 mmol) using dichloromethane (30 ml) as a solvent. 31 The white precipitate of DCU is obtained which was isolated by filtration and discarded, while the filtrate was evaporated to dryness. The obtained crude product was further recrystallized by ethanol to get pure product.…”

Section: Synthesis Of Acrylamide-based Target Compounds (C1-c4)mentioning

confidence: 99%

Synthesis and characterization of acrylamide substituted sulfanilamide based calamitic LCs: effect of terminal group on phase behavior

Meena,

Sharma,

Mali

et al. 2024

10.5267/j.ccl

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In the present study, we have prepared two phenyl ring substituted sulfanilamide bearing acrylamide linking groups. The four derivatives (C1-C4) were prepared by changing the left n-alkoxy terminal group. The liquid crystalline properties of the synthesized sulfanilamide-based compounds were investigated using POM and DSC studies. All four materials exhibit nematic liquid crystalline properties during both heating and cooling. They also demonstrate a broad temperature range and thermal stability. Further, we have studied the structure-property relationship to gain a better understanding of the effect of the linking group and variable alkoxy tail group on mesomorphic behavior. The results indicate that thermal stability, mesophase temperature range, and liquid crystalline properties depend on the linking group and variable alkyl chain length.

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Novel branched liquid crystal oligomers containing azo and Schiff base groups

Sun

Ge²,

Li³

et al. 2023

Journal of Molecular Structure

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Synthesis and characterization of biphenyl-based azo liquid crystals and its optical properties: effect of lateral and tail group

Cited by 8 publications

References 34 publications

Thiacalixarene Appended Azo‐based Supramolecular Systems: Self‐assembly and Photo Tuning Reversible Liquid Crystalline Properties

Thiacalixarene Appended Azo‐based Supramolecular Systems: Self‐assembly and Photo Tuning Reversible Liquid Crystalline Properties

Synthesis and characterization of acrylamide substituted sulfanilamide based calamitic LCs: effect of terminal group on phase behavior

Novel branched liquid crystal oligomers containing azo and Schiff base groups

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