Synthesis, characterization of new carboxylic acid derivatives bearing 1,3,4-thiadiazole moiety and study their liquid crystalline behaviors

Jaffer, Hamed J.; Aldhaif, Yasmeen A.; Tomi, Ivan Hameed R.

doi:10.1080/15421406.2016.1266881

Cited by 16 publications

(3 citation statements)

References 27 publications

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“…The solution was prepared by NACE 1D196 standard procedure [17,18], which consists of several salts: 1.0304g MgCl2.6H2O, 2.2386g CaCl2.2H2O, and 0.0532g NaCl (Baker, AR grade) with purity 98%, 97%, and 99%, respectively in 0.5 liters of distilled water and 0.125 liters of kerosene to achieve the ratio 8:2. Nitrogen gas with high purity was used for 30 minutes to reaerated the solution and then purged with CO2 gas for 15 minutes (controlled pressure is 0.70 Kg.cm-2).Three heterocyclic derivatives were prepared and characterized according to the References [19][20][21]. These derivatives include 3,5-di(4-hydroxyphnyl)-4-amino-1,2,4triazol (HAT), 4-[3-(4-methylphnyl)-1,2,4-oxadizol-5-yl]-phenol (MOP), and 4-(5-(p-tolyl)-1,3,4thiadizol-2-yl)phenol (TTP).…”

Section: Chemicals and Materialsmentioning

confidence: 99%

“…FTIR Figure 7 shows the FTIR of the prepared compounds, from the chemical formula of these compounds, it can be seen the most important band to C═C stretching in benzene ring at approximately 1600 and 1475 cm −1 , the peak at 1608 cm -1 attributed to C═ , stretching bands of C-H aromatic at 3050 cm -1 , and at 3111 cm -1 represent to the broad peak of O-H. HAT spectrum indicates the presence of the N-H stretching in primary amine occurs as two bands, symmetrical and asymmetrical, at 3320 and 3200 cm -1 , while the spectrum of MOP shows stretching bands of C-H aliphatic at 2960-2850 cm -1 of methyl group, and the spectrum of TTP observed, the peak at 1155 cm -1 is attributed to stretching of C-S. Figure 8, indicates the FTIR spectrum of film formed through adsorption of the three compounds on surface of steel indicating the decreases in intensity of amino and hydroxyl groups in HAT, hydroxyl groups in MOP and TTP. In addition to the decreasing in the intensity of C═C bonds of benzene rings because of the for ation of lin s through these rings [9][10][11][12][13][14][15][16][17][18][19][20][21].…”

Section: Sem Analysesmentioning

confidence: 99%

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Comparative Study of Different Organic Molecules as an Anti-Corrosion for Mild Steel in Kerosene

Yaqo¹,

Anaee²,

Abdulmajeed³

2020

ETJ

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The investigation on the efficiency of three organic derivatives was done as inhibitors for carbon steel using electrochemical methods at four temperatures (303, 313, 323, and 333 K) and 100 ppm. The results showed that these prepared compounds gave good efficiencies at experimental conditions by adsorption process and they act as mixed-type inhibitor, the data of corrosion were measured and debated. Using SEM, the inhibited surface of specimens was characterized. In addition, for display the interaction between these compounds and the metallic surface, the Fourier transform infrared spectra was used. In addition, the activity of antibacterial of the inhibitors against some types of bacteria was tested.

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Section: Chemicals and Materialsmentioning

confidence: 99%

Section: Sem Analysesmentioning

confidence: 99%

Comparative Study of Different Organic Molecules as an Anti-Corrosion for Mild Steel in Kerosene

Yaqo¹,

Anaee²,

Abdulmajeed³

2020

ETJ

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“…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

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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.

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

2022

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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.

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Synthesis, characterization of new carboxylic acid derivatives bearing 1,3,4-thiadiazole moiety and study their liquid crystalline behaviors

Cited by 16 publications

References 27 publications

Comparative Study of Different Organic Molecules as an Anti-Corrosion for Mild Steel in Kerosene

Comparative Study of Different Organic Molecules as an Anti-Corrosion for Mild Steel in Kerosene

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

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

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