Spectroscopic studies and thermal decomposition for (bis-((E)-2-(4-ethylphenylimino)-1,2-diphenylethanone) Schiff base and its Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) complexes prepared by direct and template reactions

Emam, Sanaa M.; Abouel‐Enein, Saeyda A.; Emara, Esam M.

doi:10.1007/s10973-016-5835-6

Cited by 52 publications

(59 citation statements)

References 61 publications

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“…The lower energy bands are assigned to 2 B 1g → 2 B 2g , whereas the higher energy bands are due to combination of 2 B 2g → 2 Eg and 2 B 1g → 2 A 1g . The positions and features of the bands agree with those reported for square planar stereochemistry around Cu(II) ion …”

Section: Resultssupporting

confidence: 86%

“…For the complexes, the ν(C═O) band was upshifted by 9–15 cm −1 , indicating that one of the carbonyl oxygen atoms binds with the metal ion . Also, the free ligand band assignable to γ(C═O) appearing at 612 cm −1 undergoes a change in its intensity and position and occurs in the range 614–624 cm −1 overlapped with ν(M─O) . Meanwhile, the ν(C─O) ligand band shifted to higher value by 11–13 cm −1 indicating the coordination of enolic oxygen atom with the metal ion .…”

Section: Resultsmentioning

confidence: 97%

“…This process is associated with weak DTG peaks appearing at T max = 345, 348 and 362 °C for Mn(II), Co(II) and Ni(II) complexes, respectively. This step is followed by complete decomposition of organic chelate rings leaving (Mn 2 O 3 + 3C), (Co 2 O 3 + 7C) and (2NiO + 3C) as a final thermal products resulting from thermal decomposition of Mn(II), Co(II) and Ni(II) complexes, respectively . The strong/weak DTG peaks corresponding to this step are at T max = 435, 428; 437, 474; and 402, 437 °C for Mn(II); Co(II); and Ni(II) complexes, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…It was observed that the elimination of lattice solvent molecules occurs over a wide temperature range, attributed to different kinds of hydrogen bonding …”

Section: Resultsmentioning

confidence: 99%

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Coordination modes of multidentate azodye ligand derived from 4,4′‐methylenedianiline towards some transition metal ions: Synthesis, spectral characterization, thermal investigation and biological activity

Abouel‐Enein

Emam

Monir

2018

Applied Organom Chemis

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Nine new azodye metal complexes of Mn(II), Co(II), Ni(II), Cu(II), Cr(III), Fe(III), Ru(III), Hf(IV) and Zr(IV) ions have been prepared via the reaction of 5,5′‐((1E,1′E)‐(methylenebis(1,4‐phenylene))bis(diazene‐2,1‐diyl))bis(6‐hydroxy‐2‐thioxo‐2,3‐dihydropyrimidin‐4(5H)‐one) (H4L) with the corresponding metal salts affording sandwich (1 L:1 M), mononuclear (2 L:1 M), binuclear (1 L,2 M) and tetranuclear (1 L,4 M) complexes. Elemental analyses, spectral methods, magnetic moment measurements and thermal studies were utilized to confirm the mode of bonding and geometrical structure for the ligand and its metal complexes. Infrared spectral data show that the H4L ligand chelates with some metal ions in keto–enol–thione or keto–thione manner. It behaves in a neutral/dibasic tetradentate fashion in sandwich and binuclear complexes. Also, it acts as a neutral bidentate moiety in the Cr(III) complex. The spectra reveal that azo group participates in chelation in all complexes. Octahedral geometry was suggested for all chelates but the Cu(II) complex with square planar geometry. The thermal stability and decomposition of the compounds were studied, the data showing that the thermal decomposition ended with metal or metal oxide mixed with carbon as final product. The electron spin resonance spectrum of the Cu(II) complex demonstrates that the free electron is located in the ( dx2−y2) orbital. Measurements of biological activity against human cell lines Hep‐G2 and MCF‐7 reveal that the Cu(II) complex has a higher cytotoxicity in comparison to the free ligand and other metal complexes, with IC50 values of 6.10 and 5.2 μg ml−1, respectively, while the ligand has anti‐tumour activity relative to some of the investigated metal complexes.

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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

“…It was observed that the elimination of lattice solvent molecules occurs over a wide temperature range, attributed to different kinds of hydrogen bonding …”

Section: Resultsmentioning

confidence: 99%

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Coordination modes of multidentate azodye ligand derived from 4,4′‐methylenedianiline towards some transition metal ions: Synthesis, spectral characterization, thermal investigation and biological activity

Abouel‐Enein

Emam

Monir

2018

Applied Organom Chemis

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“…S2), which was expected under these conditions, whereas in the case of N 2 atmosphere, the final products can differ and residues such as Cu, CuO or Cu 2 O have been observed [42][43][44][45]. The thermal stability, as well as the temperature of reaction completion, differs depending on the compound composition [46][47][48]. For mononuclear complex 1 with NO 3 -counterion, and its previously reported analogous compounds with fluorinated carboxylates, such as CF 3 COO -and C 3 F 7 COO -, the decomposition process shows a rather similar pattern.…”

Section: Thermal Studiesmentioning

confidence: 82%

Thermal and structural characterization of copper(II) complexes with phenyl-2-pyridylketoxime (HPPK)

Szczęsny

Szłyk

Kozakiewicz

et al. 2016

J Therm Anal Calorim

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Copper(II) complexes of different nuclearity with phenyl-2-pyridylketoxime (HPPK), such as mononu-were synthesized, and their thermal properties were investigated. The studies involved gas-phase monitoring of decomposition products by infrared spectroscopy. Thermal decomposition performed in air revealed the multi-stage character of the process, the course of which depends on the compound composition. In all cases, CuO was found as the final product of the process. Furthermore, the crystal structure of 1 was revealed. It shows a square-pyramidal geometry around Cu(II), with the NCS -ion situated in the apical position and two HPPK ligands present in the base, one of which is deprotonated.

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Synthesis, spectral characterization, thermal studies and biological activity of (Z)‐5‐((1,5‐dimethyl‐3‐oxo‐2‐phenyl‐2,3‐dihydro‐1H‐pyrazol‐4‐yl)diazenyl)‐6‐hydroxy‐2‐mercaptopyrimidin‐4(3H)‐one and its metal complexes

Emam

Abouel‐Enein

Abouzayed

2017

Applied Organom Chemis

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Z)-5-((1,5-Dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)diazenyl)-6hydroxy-2-mercaptopyrimidin-4(3H)-one (H 3 L) was exploited as a ligand for the synthesis of a series of metal complexes, where the metal was Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Pd(II), Cr(III) and Ru(III). The structural features of the ligand and the synthesized complexes were characterized using various analytical, spectral and thermal measurements. Infrared spectra showed that the ligand coordinates to all metal ions in a neutral keto-enol-thiol manner. It behaves in a tetradentate fashion in all binuclear complexes except the Cr(III) complex, where it is hexadentate, and in a tridentate fashion in mononuclear complexes. The azo group participates in chelation only in the case of binuclear complexes. All complexes exhibit octahedral geometry except Pd(II) and Cu(II) acetate which are square planar and square pyramidal, respectively. Kinetic parameters were computed from thermal decomposition data. Axial electron spin resonance spectra were obtained for Cu(II) complexes indicating (d x 2 −y 2 ) 1 as a ground state with small g || values affording strong interaction between the ligand and metal ions. The biological measurements reveal that the ligand has antioxidant activity relative to the metal complexes, while the metal complexes have cytotoxicity in comparison to the free ligand. KEYWORDSantioxidant and anticancer activity, azodye ligand, metal complexes, spectral methods, thermal studies

show abstract

Spectroscopic studies and thermal decomposition for (bis-((E)-2-(4-ethylphenylimino)-1,2-diphenylethanone) Schiff base and its Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) complexes prepared by direct and template reactions

Cited by 52 publications

References 61 publications

Coordination modes of multidentate azodye ligand derived from 4,4′‐methylenedianiline towards some transition metal ions: Synthesis, spectral characterization, thermal investigation and biological activity

Coordination modes of multidentate azodye ligand derived from 4,4′‐methylenedianiline towards some transition metal ions: Synthesis, spectral characterization, thermal investigation and biological activity

Thermal and structural characterization of copper(II) complexes with phenyl-2-pyridylketoxime (HPPK)

Synthesis, spectral characterization, thermal studies and biological activity of (Z)‐5‐((1,5‐dimethyl‐3‐oxo‐2‐phenyl‐2,3‐dihydro‐1H‐pyrazol‐4‐yl)diazenyl)‐6‐hydroxy‐2‐mercaptopyrimidin‐4(3H)‐one and its metal complexes

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