Synthesis and characterisation of asymmetrical mesogenic materials based on 2,5-disubstituted-1,3,4-oxadiazole

Abboud, Hussein J.; Lafta, Souad J.; Tomi, Ivan Hameed R.

doi:10.1080/02678292.2017.1360953

Cited by 11 publications

(5 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The synthesis route starts with the synthesis of 4‐((4‐alkoxybenzylidene) amino)benzoic acid (II n ) which was prepared previously by Abboud et al [15] . The compounds (III x , X=OCH 3 and Br) were prepared by an azo‐coupling reaction between 4‐methoxy aniline for (III OCH3 ) and bromo aniline for (III Br ) (diazonium) with phenol.…”

Section: Resultsmentioning

confidence: 99%

“…The synthesis route starts with the synthesis of 4-((4alkoxybenzylidene) amino)benzoic acid (II n ) which was prepared previously by Abboud et al [15] The compounds (III x , X=OCH 3 and Br) were prepared by an azo-coupling reaction between 4-methoxy aniline for (III OCH3 ) and bromo aniline for (III Br ) (diazonium) with phenol. The FT-IR for compounds (III OCH3 and III Br ) showed the stretching band of (OÀ H) groups near 3400 cm À 1 accompanied by the disappearance of stretching and bending bands for (-NH 2 ) group which was assigned to the primary amine.…”

Section: Synthesismentioning

confidence: 99%

See 1 more Smart Citation

Mesogenic Behavior of New Derivatives Containing Azo‐Ester‐Imine Links with Different Substituted Alkoxy Groups as Terminal Tails

2022

Self Cite

View full text Add to dashboard Cite

Two series of ten ester derivatives with four aromatic rings linked together by three different linkages (azo/ester/imine), 4-((4-substituted)diazenyl)phenyl 4-((4alkoxybenzylidene)amino)benzoate (IV n X=OCH 3 and V n X=Br) were synthesized. These derivatives have an alkoxy chain in the para position of the phenyl ring with different lengths (n = 3, 4, 6, 7, and 12) on one terminal side while the other side was substituted by methoxy and bromo groups linked to the pposition of phenyl. The structures of all synthesized derivatives were proven by nuclear magnetic resonance ( 1 H-NMR, 13 C-NMR), elemental analysis (C,H,N), and Fourier-transform infrared spectroscopy (FT-IR). The Mesophase textures of the final esters were observed by polarized optical microscopy (POM) and differential scanning calorimetry (DSC). Only the nematic texture was observed in the methoxy derivatives while nematic and smectic A textures were shown in the bromo mesogens. All the homologous showed mesogenic behavior with wide thermal stability. From the results, it was found that the liquid crystalline behaviors of these derivatives are dependent on the substituted group (-X) and the length of the alkoxy chain. The mesogenic behavior of these compounds was compared with other mesogens that have similar structures.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Synthesismentioning

confidence: 99%

Mesogenic Behavior of New Derivatives Containing Azo‐Ester‐Imine Links with Different Substituted Alkoxy Groups as Terminal Tails

2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…The presence of a highly polarized nitro group attached to the phenyl group expanded the electronic conjugation in the molecules effectively and produced a noticeable variation between liquid crystalline properties of the two series. [26]…”

Section: Mesomorphic Behaviors Of Compounds (Iii A-k )mentioning

confidence: 99%

“…Continuous to our previously published works concerned about the effectiveness of the five-membered different heterocyclic units placed in the central core of the mesogens on the thermal and liquid crystalline properties of the mesogens, [22][23][24][25][26] this study includes synthesis a new series of thiophene-based esters bearing imine moiety and p-nitrophenyl linked to the 5position in thiophene ring as well as a series of phenyl alkoxy benzoate attached to the nitrogen atom of imine moiety. The target of this study is to draw the attention of the combined effects of different groups and their arrangement in the molecule on their thermal and mesomorphic behaviors, the obtained results might suit certain applications in this field.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Some Boomerang Imine‐Ester Mesogenic Materials Based on Thiophene Unit

Abdulnabi

Habeeb²,

Tomi

et al. 2020

ChemistrySelect

View full text Add to dashboard Cite

A new homologous series of imine‐ester compounds ({(1E)‐[5‐(4‐nitrophenyl)‐2‐thienyl]methylene}amino)phenyl‐4‐alkoxybenzoate (series IIIa‐k) comprising thiophene ring as a rigid core has been synthesized. The molecular structures of these esters were proven by means of Fourier‐transform infrared spectroscopy (FT‐IR), nuclear magnetic resonance (1H‐NMR, 13C‐NMR) and mass spectrometry (MS). Different liquid‐crystalline textures (nematic and smectic A) have been observed by optical polarizing microscopy (OPM) and differential scanning calorimetry (DSC) techniques. The first four homologues in this series (IIIa‐IIId) displayed a nematic phase while the most of homologues that have longer alkyl group exhibited both nematic and smectic phases. The liquid crystalline phases of these compounds are dependent on the length of alkyl chain of the molecules. The mesomorphic phase stability of the prepared compounds in the presence of thiophene ring within chemical structures of the mesogens has been discussed comprehensively, and the liquid crystalline behaviors of these compounds have been compared with other reported mesogens that have similar chemical structures.

show abstract

“…Использование соединений с группами атомов, способными к образованию специфических межмолекулярных связей, весьма перспективно при разработке жидкокристаллических (ЖК) материалов с прогнозируемым комплексом свойств [2]. За счет изменения совокупности слабых направленных взаимодействий разных типов, участвующих в формировании надмолекулярных архитектур, образуются соединения с новыми электрофизическими и мезоморфными свойствами [3][4][5][6][7][8][9][10] с сохранением общей анизотропии супрамолекулярных ансамблей. В настоящее время п-н-алкилоксибензойные кислоты (ОБК) являются востребованными прекурсорами для получения новых жидкокристаллических материалов [11][12][13][14][15].…”

unclassified

Cocrystals in Systems with Alkyloxybenzoic Acids: Formation Tendencies

Efremova¹,

Kudryashova²,

Nosikova³

et al. 2019

Liq. Cryst. and their Appl.

View full text Add to dashboard Cite

Методами поляризационной оптической микроскопии и дифференциальной сканирующей калориметрии получены полные фазовые диаграммы бинарных систем, состоящих из гомологов п-налкилоксибензойных кислот с различной длиной алкоксильного заместителя: п-н-гексилоксибензойная кислота (6ОБК)-п-н-пентилоксибензойная кислота (5ОБК) и п-н-гексилоксибензойная кислота (6ОБК)-п-н-децилоксибензойная кислота (10ОБК). Рассмотрены закономерности образования сокристаллов в указанных системах. Полученные данные позволят спрогнозировать возможные изменения свойств в системах на основе замещенных бензойных кислот.

show abstract

Synthesis and characterisation of asymmetrical mesogenic materials based on 2,5-disubstituted-1,3,4-oxadiazole

Cited by 11 publications

References 45 publications

Mesogenic Behavior of New Derivatives Containing Azo‐Ester‐Imine Links with Different Substituted Alkoxy Groups as Terminal Tails

Mesogenic Behavior of New Derivatives Containing Azo‐Ester‐Imine Links with Different Substituted Alkoxy Groups as Terminal Tails

Synthesis and Characterization of Some Boomerang Imine‐Ester Mesogenic Materials Based on Thiophene Unit

Cocrystals in Systems with Alkyloxybenzoic Acids: Formation Tendencies

Contact Info

Product

Resources

About