Schiff base complexes and their versatile applications as catalysts in oxidation of organic compounds: part I

Zoubi, Wail Al; Ko, Young Gun

doi:10.1002/aoc.3574

Cited by 96 publications

(28 citation statements)

References 48 publications

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“…The functional group frequencies of the ligand and its metal complexes are given in Table . The FT‐IR spectra show that the stretching frequency of azomethine group (νC═N) shifts to 1610–1630 cm −1 in the spectra of metal complexes when compared to the Schiff base at 1662–1635 cm −1 (Figure ) . This result indicates the coordination of nitrogen atoms to metal ions .…”

Section: Resultsmentioning

confidence: 92%

Phosphorus Schiff base ligand and its complexes: Experimental and theoretical investigations

Suleman

Al‐Hamdani

Ahmed

et al. 2020

Applied Organom Chemis

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A phosphorus‐containing Schiff base was prepared from bis{3‐[2‐(4‐amino‐1,5‐dimethyl‐2‐phenylpyrazol‐3‐ylideneamino)ethyl]indol‐1‐ylmethyl}phosphinic acid and paraformaldehyde as a novel antibacterial compound. The reaction of the Schiff base ligand with VO(IV), Ni(II), Co(II), Cu(II), Zn(II), Cd(II), Hg(II), Pd(II) and Pt(IV) led to binuclear species of metal complexes, depending on the ratio of metal ion and ligand. The ligand and its complexes were investigated using elemental analysis, Fourier transform infrared, 1H NMR, 13C NMR, UV–visible and mass spectra, thermogravimetric analysis, conductivity measurements and thermal analysis. The results showed that the Schiff base behaves as a tetradentate ligand; moreover, on the basis of conductance results, of all the prepared complexes are non‐electrolytes, excepting the Pt(IV) complex. The metal complexes were found to be formed with a metal‐to‐ligand ratio of 2:1, except for the Pt(IV) complex with a ratio of 1:1. The activation thermodynamic parameters (ΔE*, ΔH*, ΔS*, ΔG* and K) and the activation energy of thermal decomposition were determined from thermogravimetric analysis using the Coats–Redfern method. The biological activities of the metal complexes were screened against the growth of bacteria and fungi in vitro to assess the antimicrobial potential and study the toxicity of the compounds. The prepared compounds have noteworthy antimicrobial properties.

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Section: Resultsmentioning

confidence: 92%

Phosphorus Schiff base ligand and its complexes: Experimental and theoretical investigations

Suleman

Al‐Hamdani

Ahmed

et al. 2020

Applied Organom Chemis

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“…The spectrum of Ni(II) complex shows peaks at 263 and 388 that lead to ligand felid. Two peaks at 874 and 980 nm described to electronic transition 3 T 1(F) → 3 T 1(p) and 3 T 1(F) → 3 T 2(F) gradually . The diamagnetic Pd(II) of low spin complex appears peaks at 474 nm due to 1 A 1g → 1 A 2g and the speak band at 876 nm attributed 1 A 1g → 1 B 1g .…”

Section: Resultsmentioning

confidence: 95%

Synthesis and bioactivity studies of novel Schiff bases and their complexes

Zoubi

Jirjees

Suleman

et al. 2019

J of Physical Organic Chem

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The new Schiff base (L) “4‐[(2,4‐dimethoxy‐benzylidene)‐amino]‐1,5‐dimethyl‐2‐phenyl‐1,2‐dihydro‐pyrazol‐3‐one” was synthesized from 2,4‐dimethoxy‐benzaldehyde and 4‐amino‐1,5‐dimethyl‐2‐phenyl‐1,2‐dihydropyrazol‐3‐one, and the geometry of Schiff base was characterized and determined by proton nuclear magnetic resonance (1H‐NMR), mass, Fourier transform infrared (FT‐IR), and ultraviolet‐visible (UV‐vis) spectroscopy. Schiff complexes of Ni(II), Pd(II), Pt(IV), Zn(II), Cd(II), and Mg(II) have been prepared by reaction of ion metals with as‐prepared Schiff base. The results showed that synthesized complexes offered 1:2 metal‐ligand ratios. Furthermore, the Schiff complexes were a tetrahedral in complexes Ni(II), Zn(II), Cd(II), and Hg(II), octahedral Pt(II), and square planer complex Pd(II). Additionally, density functional theory (DFT) was applied for calculations of both spectroscopic properties and electronic structure of prepared Schiff bases. Moreover, the Schiff base and its metal complexes have been verified in vitro against Streptococcus, Esherichia coli, Candida albicans, and Candida tropicalis in order to assess their antibacterial potential. The findings indicate that the biological activity augments on complexation reaction.

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“…Schiff bases and their complexes are considered as privileged class of compounds due to their biochemical synthesis, electrochemical analysis, anti‐fungal, antiviral, anti‐malarial, anti‐inflammatory, as well as, catalytic activities . Schiff bases are also of interest in industrial fields and as a corrosion inhibitor, thermostable materials, as well as, powerful ligands in the formation of coordination compounds . Recently, Al Zoubi and co‐workers have reported the synthesis and structural characterization of Schiff bases and their complexes derived from different amines .…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, and biological activity of Schiff bases metal complexes

Zoubi

Al‐Hamdani

Ahmed

et al. 2017

J of Physical Organic Chem

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The new Schiff base 1‐[(2‐{1‐[(dicyclohexylamino)‐methyl]‐1H‐indol‐3‐yl}‐ethylimino)‐methyl]naphthalen‐2‐ol (HL) was prepared from 1‐{[2‐(1H‐Indol‐3‐yl)‐ethylimino] methyl}‐naphthalen‐2‐ol and dicyclohexyl amine. From this Schiff base, monomeric complexes [M (L)n (H2O)2 Cl2] with M = Cr, Fe, Mn, Cd, and Hg were synthesized and characterized based on elemental analysis (EA), FT‐IR, mass(MS), UV‐visible, thermal analysis, magnetic moment, and molar conductance. The results showed that the geometrical structural were octahedral geometries for the Cr(III) and Fe(III) complexes, square planer for Pd(II) complex, and tetrahedral for Mn(II), Cd(II), and Hg(II) complexes. Kinetic parameters such as ΔE*,ΔH*, ΔG*, and K of the thermal decomposition stages were calculated from the TGA curves using Coats‐Redfern method. Additionally, density functional theory (DFT) was applied for calculations of both electronic structure and spectroscopic properties of synthesized Schiff base and its complexes. The analysis of electrostatic potential (EPS) maps correlates well with the computed energies providing on the dominant electrostatic nature of N‐H‐‐‐O interactions. The biological activities had been tested in vitro against Staphylococcus aureus, Pseudomonas aeruginosa, as well fungi like Penicillium expansum, Fusarium graminearum, Macrophomina phasealina, and Candida albicans bacteria in order to assess their antimicrobial potential.

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Schiff base complexes and their versatile applications as catalysts in oxidation of organic compounds: part I

Cited by 96 publications

References 48 publications

Phosphorus Schiff base ligand and its complexes: Experimental and theoretical investigations

Phosphorus Schiff base ligand and its complexes: Experimental and theoretical investigations

Synthesis and bioactivity studies of novel Schiff bases and their complexes

Synthesis, characterization, and biological activity of Schiff bases metal complexes

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