Synthesis, characterization, biological activity, and corrosion inhibition in acid medium of unsymmetrical tetradentate N<sub>2</sub>O<sub>2</sub> Schiff base complexes

Alturiqi, Amani S.; Alaghaz, Abdel‐Nasser M.A.; Zayed, Mohamed E.; Ammar, Reda A.

doi:10.1002/jccs.201800027

Cited by 15 publications

(21 citation statements)

References 43 publications

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“…The spectra of the Schiff bases show three significant absorption bands for π-π*(benzene), π-π* (imine) and n-π* (imine). The first band in the range 216-228 nm was attributed to the π-π* (benzene), in accordance with the reported value by Alturiqi et al [20]. The azomethine chromophore π-π* and n-π* bands of both Schiff bases present at 256-262 nm and 320-328 nm, respectively.…”

Section: Uv-vis Absorption Spectroscopysupporting

confidence: 91%

Schiff Bases and Their La(III) Complexes: Conventional and Microwave-Assisted Synthesis, Physicochemical and Spectroscopic Analysis

2021

MJCHEM

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Two lanthanum(III) Schiff base complexes, 2,2'-((1E,1'E)-((2,2-dimethylpropane-1,3-diyl)bis (azanylylidene))bis(methanylylidene))diphenollanthanum(III) [La(AD1H)] and 6,6'-((1E, 1'E)-((2,2-dimethylpropane-1,3-diyl)bis(azanylylidene))bis(methanylylidene))bis(2-methoxyphenol) lanthanum(III) [La(AD1OMe)] were successfully synthesized. The complexes were prepared by conventional reflux and microwave-assisted synthesis methods where a minimum amount of solvent was used, with a shorter reaction time for the latter. Both ligands and their lanthanum(III) complexes were characterized by spectroscopic and physicochemical analyses. The shift of ν(C=N) to a higher frequency by 15-18 cm -1 indicated that the complexation to La(III) through the azomethine N was established. It was further supported through the shifting of the azomethine proton signal to higher chemical shifts with ∆δ=0.19-0.23 ppm. In addition, the shifting of the n-π*(C=N) band in UV-Vis spectra with ∆λ= 2-16 nm also indicated the involvement of azomethine nitrogen in the complexation.

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Section: Uv-vis Absorption Spectroscopysupporting

confidence: 91%

Schiff Bases and Their La(III) Complexes: Conventional and Microwave-Assisted Synthesis, Physicochemical and Spectroscopic Analysis

2021

MJCHEM

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“…The ESR signal of complex 1 indicated g ┴ = 2.06161, which demonstrates axial octahedral symmetry undergoing tetragonal distortion with localized electron in d x 2 – y 2 orbital as shown in Figure . The ESR spectrum is typical of other octahedral copper(II) complexes . The ESR spectrum of complex 2, as shown in Figure b, is similar to other copper(II) complexes with partially resolved hyperfine splitting, with g ┴ values of 2.06161 2.24623 and 1.94959 .…”

Section: Resultssupporting

confidence: 63%

Mononuclear vs. binuclear carboxylates of copper(II) with 2,2′‐bipyridine: Synthesis, characterization, structural description, and properties

Iqbal

Ali

Sohail³

et al. 2019

J Chinese Chemical Soc

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Two new copper(II) carboxylate complexes with 2,2′‐bipyridine and para‐nitrophenyl acetate (complex 1) and phenyl acetate (complex 2) have been synthesized; isolated in quantitative yield; and characterized using fourier‐transform infrared spectroscopy (FT‐IR), electron paramagnetic resonance, absorption spectroscopy, electrochemistry, and powder and single crystal X‐ray diffraction (XRD) techniques. Being mononuclear, the geometry around copper in complex 1 is a Jahn–Teller distorted octahedral, while complex 2 is binuclear with slightly distorted square pyramidal geometry around both copper ions. Powder XRD indicated several peaks in spectra of both complexes, which coincided with their theoretical spectra. FT‐IR results of the carboxylate stretching frequency were in accordance with the single crystal structure data. Electron paramagnetic resonance spectra of complexes 1 and 2 yielded g┴ values of 2.06161 and 2.24623 and 1.94959, respectively, indicating a localized electron in b1 (d x2–y2‐orbital). Ultra‐violet (UV)–visible spectroscopy and electrochemistry helped in characterization, as well as in deoxyribonucleic acid (DNA)‐binding ability of the complexes, yielding DNA‐binding constant values = 1.351 × 104 and 1.361 × 104 and 1.820 × 104 and 2.426 × 104 M−1, respectively, for complexes 1 and 2. The complexes demonstrate good biological potential.

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“…In recent times, Schiff bases attract the researchers including biologists to its application as an antioxidant [7]. These compounds play an important role in the development of coordination chemistry.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Crystal structure, Electrochemical, Theoretical Studies and Antioxidant Activities of New Schiff Base

Madi

Haffar

Benghanem

et al. 2021

Journal of Molecular Structure

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A novel Schiff base 2, 2'-((1E,1'E)-((4-methyl-1, 3-phenylene) bis (benzylidene)) bis (methylethylidene)) bis (4-methoxyphenol) (L) was the result of the reaction between 2, 4diaminotoluene and 2-hydroxy-5-methoxy benzaldehyde. The compound (L) was characterized using IR, UV-Vis, 1 H, and 13 C NMR techniques. The structure of the ligand was determined by X-Ray Diffraction method (XRD). All experimental results were proved and explained theoretically exploiting DFT (Density Functional Theory) calculations. The electrochemical properties were studied through the cyclic voltammetry and the results were explained by the mean of the FMOs (Frontier Molecular Orbitals). The antioxidant activity of the synthesized Schiff base was evaluated by utilizing several tests as DPPH (1, 1-diphenyl-2picryl hydrazyl), ABTS (2, 2'-azino-bis(3-ethyl benzthiazoline-6-sulfonicacid), hydroxyl radical scavenging test, reducing power test, β-carotene bleaching test as chemical methods, and the superoxide radical scavenging as electrochemical method. The effective concentration (EC 50 ) showed that the compound has a good antioxidant activity, and the relationship between the structure-activity and the calculated electronic properties demonstrates that the compound has a good reactivity.

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Synthesis, characterization, biological activity, and corrosion inhibition in acid medium of unsymmetrical tetradentate N₂O₂ Schiff base complexes

Cited by 15 publications

References 43 publications

Schiff Bases and Their La(III) Complexes: Conventional and Microwave-Assisted Synthesis, Physicochemical and Spectroscopic Analysis

Schiff Bases and Their La(III) Complexes: Conventional and Microwave-Assisted Synthesis, Physicochemical and Spectroscopic Analysis

Mononuclear vs. binuclear carboxylates of copper(II) with 2,2′‐bipyridine: Synthesis, characterization, structural description, and properties

Synthesis, Crystal structure, Electrochemical, Theoretical Studies and Antioxidant Activities of New Schiff Base

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Synthesis, characterization, biological activity, and corrosion inhibition in acid medium of unsymmetrical tetradentate N2O2 Schiff base complexes

Cited by 15 publications

References 43 publications

Schiff Bases and Their La(III) Complexes: Conventional and Microwave-Assisted Synthesis, Physicochemical and Spectroscopic Analysis

Schiff Bases and Their La(III) Complexes: Conventional and Microwave-Assisted Synthesis, Physicochemical and Spectroscopic Analysis

Mononuclear vs. binuclear carboxylates of copper(II) with 2,2′‐bipyridine: Synthesis, characterization, structural description, and properties

Synthesis, Crystal structure, Electrochemical, Theoretical Studies and Antioxidant Activities of New Schiff Base

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Synthesis, characterization, biological activity, and corrosion inhibition in acid medium of unsymmetrical tetradentate N₂O₂ Schiff base complexes