Spectroscopic studies on some azo compounds and their cobalt, copper and nickel complexes

Masoud, Mamdouh S.; Khalil, Ekram A.; Hindawy, Ahmed M.; Ali, Alaa E.; Mohamed, Eman F.

doi:10.1016/j.saa.2004.01.019

Cited by 74 publications

(41 citation statements)

References 32 publications

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“…There is no peak of unreacted -NH2 group in the IR spectra of ligand which indicate the synthesis of proposed ligand. The band in the IR spectra of ligand at 1692 cm -1 is assigned for (N-C=O) group of pyrimidine ring 16 . The band at 1768 cm -1 indicate the presence of free ketonic (-C=O) group of ligand 17 .…”

Section: Resultsmentioning

confidence: 99%

“…The band at 1768 cm -1 indicate the presence of free ketonic (-C=O) group of ligand 17 . A band at 3065 cm -1 may be due to stretching vibration of heterocyclic -NH group of characteristics of pyrimidine ring 16 . The IR spectra of metal complexes show significant changes compared to the free ligand.…”

Section: Resultsmentioning

confidence: 99%

“…Electronic absorption spectra in the 200-900 nm range were obtained in DMF on a Systronic UV-visible spectrophotometer. 1 H NMR spectra (at room temperature) (in DMSO-d 6 ) was recorded on a Bruker Avance II 400 NMR spectrometer with reference to TMS (0.0 ppm). The FAB mass spectra were recorded on a JEOL SX 102/DA-6000 mass spectrometer/data system using argon/xenon (6 kV, 10 ma) as the FAB gas.…”

Section: Methodsmentioning

confidence: 99%

“…Due to multifunctional coordinating ability of pyrimidines and its derivatives, they have been used for synthesis of mononuclear and binuclear transition metal complexes 3,4 . The enormous interest in the field of coordination chemistry of transition metal ions with Schiff bases is due to variety of applications of these compounds in biological, clinical, analytical and pharmacological areas 5,6 . Recently, some of the Schiff base complexes possessing potent antibacterial activities have been reported 7 .…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, Characterization and Antimicrobial Studies of Novel Binuclear Transition Metal Complexes of Schiff Base Derived from 1-Amino-5-methyl-2,6-pyrimidine-dione and 2,3-Butanedione

Singh¹,

Srivastava²

2013

Asian J. Chem.

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CH3COO-and L = ligand) of a Schiff base ligand derived from 1-amino-5-methyl-2,6-pyrimidine-dione and 2,3-butanedione have been synthesized and characterized by elemental analysis, molar conductance measurements, magnetic moment measurements, IR, UV-visible, 1 H NMR, EPR and mass spectral studies. Electronic spectral data and magnetic moment values indicate octahedral geometry for all the metal complexes. In vitro antimicrobial activity of ligand and its metal complexes were also studied against bacteria (Bacillus subtilis and Escherichia coli) and fungi (Aspergillus niger and Aspergillus flavus) which show antimicrobial activity of ligand and binuclear metal complexes.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis, Characterization and Antimicrobial Studies of Novel Binuclear Transition Metal Complexes of Schiff Base Derived from 1-Amino-5-methyl-2,6-pyrimidine-dione and 2,3-Butanedione

Singh¹,

Srivastava²

2013

Asian J. Chem.

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“…The lilac precipitates of a completely by K 2 O 8 S 2 oxidized monoazo compound of functional ABTS showed major stretching vibrations at 1506.6, 1472.8, and 1441.4 cm −1 . The range of (1555) 1525-1410 cm −1 is thereby associated with the presence of the -N=N-double bonds in the majority of azo dyes [63][64][65][66].…”

Section: Liquid Chromatography-mass Spectrometry (Lc-ms) Examination mentioning

confidence: 99%

Formation of the Azodication (ABTS2+) from ABTS [2,2′-Azinobis-(3-ethylbenzothiazoline-6-sulphonate)] in Sterile Plant Cultures: Root–Exuded Oxidoreductases Contribute to Rhizosphere Priming

Gramss

2018

Soil Systems

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Abstract:Rhizosphere priming by terrestrial plants comprises increased or repressed efflux of CO 2 and N from soil organic matter (SOM), decaying under the impact of temperature, moisture, and the composition of rhizodeposits. Contemporarily, increases in water solubility vs. losses in molecular size, aromaticity, and the content in phenolic OH groups denote the degradation of SOM in planted soil. Root peroxidases (POs) and 'polyphenoloxidases' are surmised to contribute to these effects, however, final evidence for this is lacking. Therefore, seedlings of white mustard, alfalfa, and oilseed rape with wide spans in PO release were grown in hydroponic cultures at variable levels of Cu/Fe/Mn as Fenton metals, but also under P and Fe starvation to stimulate the release of carboxylic acids that form catalytic Mn 3+ chelants from Mn 2+ and MnO 2 . The shortage in active oxygen as a cosubstrate of POs delayed the immediate oxidation of 2,2 -azinobis-(3-ethylbenzothiazoline-6-sulphonate) (ABTS) supplements to the green ABTS •+ by PO/H 2 O 2 , the possible formation of Mn 3+ via PO catalyzed aryloxy radicals from root-released phenolics, and of HO • by metal cations in H 2 O 2 dependent Fenton-like reactions. Enhanced by exuded and external malate, O 2 independent MnO 2 supplements in some treatments formed ABTS •+ spontaneously. The culture fluids then turned red in all treatments within 24-60 h by the formation of azodication (ABTS 2+ ) derivatives in a second plant initiated oxidation step that is known to be catalyzed by substrate radicals. It is concluded that plants initiate oxidative activities that contribute to rhizosphere priming in an environment of oxidoreductase and carboxylate exudates, the indicated presence of mediating substrate radicals, and the cations and (hydr)oxides of transition metals. Pathways of H 2 O 2 production upon the degradation of carboxylates and by the POs themselves are indicated.

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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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Spectroscopic studies on some azo compounds and their cobalt, copper and nickel complexes

Cited by 74 publications

References 32 publications

Synthesis, Characterization and Antimicrobial Studies of Novel Binuclear Transition Metal Complexes of Schiff Base Derived from 1-Amino-5-methyl-2,6-pyrimidine-dione and 2,3-Butanedione

Synthesis, Characterization and Antimicrobial Studies of Novel Binuclear Transition Metal Complexes of Schiff Base Derived from 1-Amino-5-methyl-2,6-pyrimidine-dione and 2,3-Butanedione

Formation of the Azodication (ABTS2+) from ABTS [2,2′-Azinobis-(3-ethylbenzothiazoline-6-sulphonate)] in Sterile Plant Cultures: Root–Exuded Oxidoreductases Contribute to Rhizosphere Priming

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

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