Thermal, dielectric characteristics and conduction mechanism of azodyes derived from quinoline and their copper complexes

El-Ghamaz, N.A.; Diab, M.A.; El-Bindary, A.A.; El‐Sonbati, A.Z.; Nozha, S.G.

doi:10.1016/j.saa.2015.01.065

Cited by 31 publications

(12 citation statements)

References 44 publications

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“…7 and 8, respectively. The decreasing behavior of e r and e i can be attributed to the loss of water molecules of the complexes [21,32]. This behavior is in agreement with the results obtained from thermal analysis (see Table 3; Fig.…”

Section: Temperature and Frequency Dependence Of Dielectric Constant supporting

confidence: 91%

“…6. In general, both e r and e i are found to decrease with increasing frequency as expected for other organic compounds [21,39]. In general, for semiconductor materials, the dielectric constant is increasing with increasing temperature, but for SQL, at the first stage of heating a different behavior of e r and e i with temperature is observed.…”

Section: Temperature and Frequency Dependence Of Dielectric Constant supporting

confidence: 60%

“…IR spectra of the complexes (1)(2)(3)(4)(5)(6) show that the ligand behaves as a bidentate ligand depending on the metal salt used. IR spectrum of the Schiff base ligand (SQL) shows a broad band assigned to phenolic OH group; t(OH) [5,21,22] and a strong band at 1305 cm -1 assigned to the stretching frequency of the phenolic C-O bond; t(C-O) [5,21,22], affected by complexation with different degrees. The bands appearing in the regions 1480 and 750 cm -1 were usual modes of phenyl ring vibration [21,22], while a band at 2848 cm -1 was for CH 3 stretching vibrations of the methyl group [25].…”

Section: Ir Spectra and Mode Of Coordinationmentioning

confidence: 99%

“…IR spectrum of the Schiff base ligand (SQL) shows a broad band assigned to phenolic OH group; t(OH) [5,21,22] and a strong band at 1305 cm -1 assigned to the stretching frequency of the phenolic C-O bond; t(C-O) [5,21,22], affected by complexation with different degrees. The bands appearing in the regions 1480 and 750 cm -1 were usual modes of phenyl ring vibration [21,22], while a band at 2848 cm -1 was for CH 3 stretching vibrations of the methyl group [25]. The (C=N) Schiff (1615 cm -1 ) stretching frequency in the free ligand shifted towards lower values (1590-1575 cm -1 ) in all complexes, indicating that the azomethine nitrogen atom was coordinated [4], i.e., the nitrogen atom is considered to be another center for complex formation.…”

Section: Ir Spectra and Mode Of Coordinationmentioning

confidence: 99%

“…8-Hydroxyquinoline is the only one, among seven isomeric monohydroxyquinolines, capable of forming complexes with divalent metal ions through chelation [21,22]. El-Sonbati and El-Bindary [23] described the synthesis and characterization by different techniques of Schiff bases derived from 7-formyl-8-hydroxyquinoline (oxine) with 2-aminophenol or 2-aminopyridine and their coordination compounds of copper(II), nickel(II), cobalt(II), manganese(II), iron(II), tin(II), mercury(II), dioxouranium(VI) and iron(III).…”

Section: Introductionmentioning

confidence: 99%

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Dielectrical properties and conduction mechanism of quinoline Schiff base and its complexes

et al. 2015

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The synthesized Schiff base ligand 8-hydroxyquinoline-7-formylidene-4-amino-1-phenyl-2,3-dimethylpyrazolin-5-one (SQL) and its Cu(II), VO(IV) and UO 2 (II) complexes are characterized by various physicochemical techniques. The thermal properties, dielectric properties, alternating current conductivity (r ac ) and conduction mechanism of SQL and its complexes (1-6) are investigated in the frequency range of 0.1-100 kHz and temperature range 298-583 K. The temperature and frequency dependence of the real and the imaginary part of the dielectric constant are studied. The values of the thermal activation energy of conduction mechanism for SQL and its complexes under investigation are calculated at different test frequencies, and found to be in the range 0.0023-0.0798 eV for DE 1 and 0.0897-1.296 eV for DE 2 . The ac conductivity, r ac , is related to the frequency as r ac a x S where the behavior of the exponent S with temperature determines the operating conduction mechanism. The correlated barrier hopping model is found to be the dominant conduction mechanism for SQL and its complexes (1) and (3-5), and the values of the maximum barrier height (W m ) are calculated for SQL and its complexes (1) and (3-5). The quantum-mechanical tunneling is the dominant conduction mechanism for complexes (2) and (6).

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Section: Temperature and Frequency Dependence Of Dielectric Constant supporting

confidence: 91%

Section: Temperature and Frequency Dependence Of Dielectric Constant supporting

confidence: 60%

Section: Ir Spectra and Mode Of Coordinationmentioning

confidence: 99%

Section: Ir Spectra and Mode Of Coordinationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dielectrical properties and conduction mechanism of quinoline Schiff base and its complexes

et al. 2015

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Characterization, thermal behavior, and electrical measurements of poly[4‐(2‐bromoisobutyroyl methyl)styrene]

Biryan

Demirelli

2017

Adv Polym Technol

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The 4-(2-bromoisobutyroyl methyl)styrene [BBMS] monomer was synthesized. The homopolymer of BBMS was prepared by free radical polymerization method. The decomposition behavior of P(BBMS) was thermally investigated by thermogravimetric analysis (TGA). For thermal decomposition kinetics of poly(BBMS), Flynn-Wall-Ozawa method was applied to thermogravimetry curves. The first step, which is one of the two decomposition stages, is comprehensively related to elimination of hydrogen bromide and the other step is related to a multi-step process. The activation energy (E a ) of thermal decomposition of the first step and 50% weight loss is 148.5 and 190.7 kJ/mol, respectively. The results showed that the side group elimination without chain breaking comprehensively proceeded at lower temperature, and at progressive temperatures subsequently the specific chain scission did so. Degradation of poly(BBMS) did not lead to depolymerization. 1 H, 13 C-NMR, and FT-IR analyses showed that the decomposition products during degradation of poly(BBMS) to 260°C were comprehensively HBr and methacrylic acid. Electrically conducting graphene-based poly(BBMS) composites were prepared. The DC and AC electrical measurements of graphene-based poly(BBMS) composites were carried out. The AC dielectric measurements of poly(BBMS) were investigated up to 70°C between 100 Hz and 20 kHz depending on the alternating current conductivities. The dipolar functional groups (C-O, C=O, and Br) of the BBMS segment possesses significantly affect the dielectric constant. Also, the activation energy profile of different graphene/ poly(BBMS) composites were revealed by measuring DC conductivity of individual composite material. K E Y W O R D S characterization, electrical properties, poly(BBMS), thermal behavior | 1995 BIRYAN YANnd ndDEBIDEEB F I G U R E 1 (a) 1 H-NMR and (b) 13 C NMR spectra of monomer(BBMS) [Colour figure can be viewed at wileyonlinelibrary. com] How to cite this article: Biryan F, Demirelli K. Characterization, thermal behavior, and electrical measurements of poly[4-(2-bromoisobutyroyl methyl) styrene].

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Ligational behavior of bidentate nitrogen–oxygen donor 8‐quinolinolazodye toward Ni²⁺ and Zn²⁺ ions: Preparation, spectral, thermal, experimental, theoretical, and docking studies

El-Nasser

Abdel‐Latif

2023

Applied Organom Chemis

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The 5-(4-aryl azo)-8-hydroxyquinolines (L1-L3) and their metal complexes with Ni 2+ and Zn 2+ have been produced. Various spectroscopic techniques have been employed to analyze the ligand and complexes. The structures of the prepared compounds have been confirmed by Fourier transform infrared (FT-IR), proton nuclear magnetic resonance ( 1 H NMR), molar conductance, magnetic measurements, thermal gravimetric and differential thermal analyses (TG and DTA), and electronic transition. The FT-IR spectra showed that the ligands are coordinated to the metal ions in a bidentate manner with donor sites of the azomethine-N and phenolic-OH. The FT-IR and UV-Visible spectra were compared with the calculated results and showed a good agreement. The mass spectra concluded that the ligands' molecular weights and the calculated estimated m/z values match well. The complexes contain coordinated and hydrated water as confirmed by the TG results. The complexes are tetrahedral, trigonal bipyramid, and octahedral geometrical structures and act as non-

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Thermal, dielectric characteristics and conduction mechanism of azodyes derived from quinoline and their copper complexes

Cited by 31 publications

References 44 publications

Dielectrical properties and conduction mechanism of quinoline Schiff base and its complexes

Dielectrical properties and conduction mechanism of quinoline Schiff base and its complexes

Characterization, thermal behavior, and electrical measurements of poly[4‐(2‐bromoisobutyroyl methyl)styrene]

Ligational behavior of bidentate nitrogen–oxygen donor 8‐quinolinolazodye toward Ni²⁺ and Zn²⁺ ions: Preparation, spectral, thermal, experimental, theoretical, and docking studies

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Thermal, dielectric characteristics and conduction mechanism of azodyes derived from quinoline and their copper complexes

Cited by 31 publications

References 44 publications

Dielectrical properties and conduction mechanism of quinoline Schiff base and its complexes

Dielectrical properties and conduction mechanism of quinoline Schiff base and its complexes

Characterization, thermal behavior, and electrical measurements of poly[4‐(2‐bromoisobutyroyl methyl)styrene]

Ligational behavior of bidentate nitrogen–oxygen donor 8‐quinolinolazodye toward Ni2+ and Zn2+ ions: Preparation, spectral, thermal, experimental, theoretical, and docking studies

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Ligational behavior of bidentate nitrogen–oxygen donor 8‐quinolinolazodye toward Ni²⁺ and Zn²⁺ ions: Preparation, spectral, thermal, experimental, theoretical, and docking studies