Ali Ourari

Ferhat Abbas University of Setif, Satif, Sétif, Algeria

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Publications (34)40.46 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: In the title compound, [Cu(C10H11BrNO)2], the asymmetric unit consists of one-half of the mol­ecule, the other half being generated by an inversion centre. Hence the CuII cation is symmetrically coordinated by two bidentate Schiff base anions in a slightly distorted square-planar environment with Cu-O and Cu-N bond lengths of 1.8786 (19) and 2.009 (2)
    02/2015; 71(2):m33-m34. DOI:10.1107/S2056989015001309
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    ABSTRACT: The removal of cetylpyridinium bromide (CPB) from aqueous solutions was investigated using a mineral adsorbent called Maghnite (a bentonite obtained from Maghnia, West Algeria). The adsorption kinetics of CPB on Maghnite is pseudo-second order and the adsorption isotherm follows essentially the model of Redlich–Peterson. The results obtained show that CPB is adsorbed on Maghnite with an adsorption capacity of 0.438 mmol/g (168.4 mg/g). Physical data indicate that CPB is efficient for the deinking of newspaper solutions, only when the natural Maghnite is associated to CPB. These results are of practical interest, since CPB shows a double action—to protect and to optimize aquatic environment.
    Journal of Surfactants and Detergents 07/2014; 17(4):785-793. DOI:10.1007/s11743-013-1557-y · 1.35 Impact Factor
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    ABSTRACT: Three monomers 6-[3'-N-pyrrolpropoxy]-2-hydroxyacetophenone (1), 5-(3'-N-pyrrol propoxy)-2-hydroxyacetophenone (2) and 4-(3'-N-pyrrolpropoxy)-2-hydroxyacetophenone (3) were synthesized and their poly(pyrrole) films were electrodeposited on glassy carbon (GC) and Indium tin oxide (ITO) conductive electrodes by anodic oxidation in acetonitrile solutions containing n-Bu)(4)N+CIO4- (TBAP 0.1 M). These films, currently called modified electrodes (noted ME), were obtained by the successive cycling at the appropriate potentials. These films contain chelating sites such as carbonyl group bearing the phenolic function which could play an important role in coordination chemistry. The electrodeposited poly(pyrrole) films on the ITO conductive glass electrodes offer some analytical advantages as the optical and electronic properties. Consequently, these new materials of electrodes were characterized by cyclic voltammetry while the morphology of these films was studied by FT-IR spectroscopy, scanning electron microscopy (SEM), dispersive energy X-ray spectroscopy and atomic force microscopy (AFM). The AFM studies show that the morphology of polypyrrole (PPy) films, electrodeposited on ITO surface, depends on the specific structure of the compound deriving from the monoalkylated dihydroxyacetophenone 1.2 and 3. The coordination of copper was performed by electroreduction reaction in presence of ligand (3) and copper acetate salt. The resulting electrode material was tested towards the electrocatalytic activity in the reduction of bromocyclopentane.
    Colloids and Surfaces A Physicochemical and Engineering Aspects 04/2014; 446:190–198. DOI:10.1016/j.colsurfa.2014.01.047 · 2.35 Impact Factor
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    ABSTRACT: The title Schiff base, C17H13NO2, crystallizes in the zwitterionic form and an N-H⋯O hydrogen bond closes an S(6) ring. The dihedral angle between the aromatic ring systems is 15.62 (9)°. In the crystal, O-H⋯O hydrogen bonds link the mol-ecules into C(11) chains propagating in [010].
    Acta Crystallographica Section E Structure Reports Online 02/2014; 70(Pt 2):o107. DOI:10.1107/S160053681303451X · 0.35 Impact Factor
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    ABSTRACT: A tetradentate Schiff base ligand (3) has been synthesized via the reaction of 5′-(N-methyl-N-phenylaminomethyl)-2′-hydroxyacetophenone (2) with a stoichiometric amount of ethylenediamine in absolute ethanol. Compound 2 was prepared by reaction of 5′-chloromethyl-2′-hydroxyacetophenone (1) with N-methylaniline, in the presence of sodium bicarbonate in tetrahydrofuran. Compound 1, on the other hand, was obtained through a reaction between a hydrochloric acid–formaldehyde mixture and 2′-hydroxyacetophenone. Refluxing a mixture of the Schiff base (3) and a stoichiometric amount of nickel(II) acetate tetrahydrate in absolute ethanol at 50 °C under a nitrogen atmosphere afforded the expected tetradentate nickel(II)-Schiff base coordination compound (4). Compounds 1–4 have been characterized with the aid of a number of techniques: UV–Vis spectrophotometry; FT-IR, 1H NMR, 13C NMR, and mass spectrometry; and elemental analysis. Cyclic voltammetry has been employed to investigate the redox behavior of compound 4 as well as the ability of the electrogenerated nickel(I) form of 4 to catalyze the reduction of 1-iodooctane.
    Polyhedron 01/2014; 67:59-64. DOI:10.1016/j.poly.2013.08.056 · 2.05 Impact Factor
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    ABSTRACT: A pentadentate Schiff base, 2,2 '-(((azanediylbis(propane-3,1-diyl))bis(azanylylidene))bis(methanylylidene))diphenol (1), has been synthesized via the reaction of salicylaldehyde with N-1-(3-aminopropyl)propane-1,3-diamine [HN(C3H6NH2)(2)] in absolute ethanol. Refluxing a mixture of 1 with the hydrated acetate salts of nickel(II), zinc(II), iron(II), and copper(II) affords each of the expected M(II)-Schiff base complexes. These complexes have been characterized by means of FT-IR, H-1 NMR, C-13 NMR, and mass spectrometry as well as UV-Vis spectrophotometry and elemental analysis. In addition, the molecular structures of the copper(II) and nickel(II) complexes were determined by means of X-ray crystallography. Antioxidant and antibacterial activities of 1 and its complexes were evaluated in vitro. Highest DPPH radical-scavenging activity was observed for Fe(ll)-1 with an IC50 of 0.39 mg mL-1, followed by 1 (IC50 = 3,38 +/- 0.01 mg mL(-1)). Use of the beta-carotene-linoleic acid bleaching assay revealed that 1 has the highest antioxidant activity and has significant inhibition of lipid peroxidation with 1% of 94.21 +/- 0.003%, followed by Fe(ll)-1 and Ni(II)-1 with I% of 34.29 +/- 2.08% and 30.77 +/- 1.91%, respectively. Antibacterial activity of 1 and its transition-metal complexes was investigated by use of disk diffusion assay; Zn(II)-1 and Ni(II)-1 exert a high inhibition of the growth of all bacterial strains with inhibition diameters ranging from 8 to 14 mm.
    Polyhedron 01/2014; 85. DOI:10.1016/j.poly.2014.09.006 · 2.05 Impact Factor
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    ABSTRACT: In the title hydrate, C17H18N2O5·H2O, the complete organic mol-ecule is generated by a crystallographic mirror plane with one C and one O atom lying on the mirror plane. The O atom of the water mol-ecule has m site symmetry. Two symmetry-related intra-molecular O-H⋯O hydrogen bonds complete S(6) rings in the organic mol-ecule. In the crystal, the components are linked into (010) sheets by O-H⋯O and N-H⋯O hydrogen bonds.
    Acta Crystallographica Section E Structure Reports Online 10/2013; 69(Pt 10):o1591. DOI:10.1107/S1600536813026184 · 0.35 Impact Factor
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    ABSTRACT: Both screen‐printed electrodes modified with a dispersion of carbon black (CB) and solid paste electrodes prepared using a nanostructured CB were developed and characterized. Indeed, increasing the peak currents and/or their shifting to negative potentials were observed, exhibiting efficient electrocatalytic activity towards nitrite oxidation with high sensitivity and low detection limit. Solid carbon paste electrodes (SCPEs) and solid carbon black paste electrodes (SCBPEs) were challenged in amperometric mode with nitrite since detection limit reached is 65 and 5 nM respectively. Nitrate was first reduced to nitrite in reductor column, then detected on SCBPEs. Nitrate and nitrite were determined in real samples.
    Electroanalysis 09/2013; 25(10):2289-2297. DOI:10.1002/elan.201300257 · 2.50 Impact Factor
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    ABSTRACT: A new copper(II) complex Cu(II)-L containing N2O2 donor atoms has been prepared from 6-[3'-(N-pyrrol) propoxy]-2-hydroxyacetophenone and diaminoethane in the presence of copper acetate monohydrate. It was characterized by spectroscopic methods such as FT-IR, UV-vis, mass spectra, elemental analysis and cyclic voltammetry. The molecular structure of Cu(II)-L has also been confirmed by X-ray diffraction analysis. The electrochemical behavior of copper(II)-Schiff base complex containing pyrrol groups has been investigated in DMF and acetonitrile solutions using cyclic voltammetry. Thus, conducting polymeric films of polypyrrole were obtained on the surfaces of glassy carbon and ITO electrodes using copper(II) complex as monomer. The modified electrodes were electrochemically and morphologically characterized and their electrocatalytic properties in heterogeneous phase have also been investigated. The AFM studies show that the morphology of polypyrrole (PPy) films on ITO-electrodes depends on the number of cyclical scans. The electrocatalytic performances of this complex seem to be more efficient towards the electro-oxidation of isopropylic alcohol than any other kinds of alcohols such as methanol, ethanol and benzyl alcohol. The electro-reduction of carbon dioxide was also examined. (c) 2013 Elsevier B.V. All rights reserved.
    Inorganic Chemistry Communications 07/2013; 33:118-124. DOI:10.1016/j.inoche.2013.04.002 · 2.06 Impact Factor
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    ABSTRACT: In the title 1:1 adduct, C9H12N2O2·C6H6O, the dihedral angle between the benzene ring and the salicylic amide group is 6.68 (6)°. The conformation of the amide group is supported by two intra-molecular N-H⋯O hydrogen bonds, which close S(6) and S(7) rings. In the crystal, the components are linked by O-H⋯O and N-H⋯O hydrogen bonds, generating (100) sheets.
    Acta Crystallographica Section E Structure Reports Online 04/2013; 69(Pt 4):o497. DOI:10.1107/S1600536813005849 · 0.35 Impact Factor
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    ABSTRACT: In the centrosymmetric binuclear cation of the title compound, [Cu(C(8)H(7)O(4))(H(2)O)(C(5)H(5)N)(2)](2)(ClO(4))(2), the Cu(II) atoms are bridged by a pair of two dehydro-acetate anions in a bis-/monodentate mode. The distorted octa-hedral N(2)O(4) coordination sphere of the metal cation is completed by two pyridine N atoms and one O atom of a water mol-ecule. The complex cations and the perchlorate counter anions are arranged in layers parallel to (100). O-H⋯O hydrogen bonds between the coordinating water mol-ecules and the perchlorate anions constitute ribbons parallel to [10-1]. C-H⋯O hydrogen bonds are also observed.
    Acta Crystallographica Section E Structure Reports Online 11/2012; 68(Pt 11):m1356-7. · 0.35 Impact Factor
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    ABSTRACT: In the centrosymmetric binuclear cation of the title compound, [Cu(C8H7O4)(H2O)(C5H5N)2]2(ClO4)2, the CuII atoms are bridged by a pair of two dehydro­acetate anions in a bis-/monodentate mode. The distorted octa­hedral N2O4 coordination sphere of the metal cation is completed by two pyridine N atoms and one O atom of a water mol­ecule. The complex cations and the perchlorate counter anions are arranged in layers parallel to (100). O—H⋯O hydrogen bonds between the coordinating water mol­ecules and the perchlorate anions constitute ribbons parallel to [10-1]. C—H⋯O hydrogen bonds are also observed.
    Acta Crystallographica Section E Structure Reports Online 10/2012; 68(11). DOI:10.1107/S1600536812041608 · 0.35 Impact Factor
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    ABSTRACT: Mol-ecules of the title compound, [Cu(C(21)H(17)N(3)O(4))(H(2)O)], lie across a crystallographic mirror plane. The Cu(II) atom is five-coordinated in a distorted square-pyramidal environment by two phenolate O atoms and two imine N atoms of the tetra-dentate Schiff base anion in the basal plane and one water mol-ecule in the apical position. Because of symmetry, the pyridine N atom and the corresponding C atom at the 4-position of the pyridine ring are disordered. The crystal packing can be described as being composed of alternating layers stacked along [001]. Intra-molecular C-H⋯N and inter-molecular C-H⋯O and O-H⋯O hydrogen-bonding inter-actions, as well as C-H⋯π and π-π stacking inter-actions [shortest centroid-centroid distance = 3.799 (8) Å and inter-planar distance = 3.469 (2) Å] are observed.
    Acta Crystallographica Section E Structure Reports Online 08/2012; 68(Pt 8):m1069-70. DOI:10.1107/S1600536812031273 · 0.35 Impact Factor
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    ABSTRACT: In the title compound, [Cu(ClO(4))(2)(C(2)H(8)N(2))(C(5)H(5)N)(2)], the Cu(II) cation is located on a twofold rotation axis and is coordinated by four N and two O atoms in a tetragonally distorted octahedral geometry. The crystal packing can be described as ClO(4) tetra-hedra and CuN(4)O(2) octa-hedra alternating in a zigzag fashion along the c axis. The structure is stabilized by intermolecular N-H⋯O and C-H⋯O hydrogen bonds, as well as π-π interactions [centroid-centroid distance = 3.7179 (15) Å].
    Acta Crystallographica Section E Structure Reports Online 08/2012; 68(Pt 8):m1030-1. DOI:10.1107/S1600536812029868 · 0.35 Impact Factor
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    ABSTRACT: Three complexes Ru(III)ClLn involving different tetradentate Schiff base ligands Ln (see L1, L2 and L3 in Chart 1) were used as catalysts in the oxidation of cyclooctene and tetraline in the presence of molecular dioxygen associated with benzoic anhydride. The efficiency of this oxidation reaction was tested in the presence of two apical bases: 1- or 2-methylimidazole. All complexes exhibit a quasi-reversible redox system. The electrolysis experiments were carried out at controlled potential for each complex, using different substrates such as cyclooctene and tetraline. The oxidized products are cyclooctene oxide (turnover 6.7), a mixture of 1-tetralol and 1-tetralone (turnover 7.6) respectively.
    Electrochimica Acta 07/2012; 75:366–370. DOI:10.1016/j.electacta.2012.05.021 · 4.09 Impact Factor
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    ABSTRACT: The title mol-ecule, C(16)H(12)Cl(4)N(2)O(2), lies about an inversion center. The symmetry-unique part of the mol-ecule contains an intra-molecular O-H⋯N hydrogen bond. In the crystal, mol-ecules are arranged in corrugated layers parallel to (-101). Weak π-π stacking inter-actions, with a centroid-centroid diatance of 3.7923 (13) Å, are present.
    Acta Crystallographica Section E Structure Reports Online 06/2012; 68(Pt 6):o1700. DOI:10.1107/S1600536812020235 · 0.35 Impact Factor
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    ABSTRACT: In the title compound, [Co(C(16)H(16)NO(2))(3)], the Co(III) atom is six-coordinated in an irregular octa-hedral geometry by three N,O-chelating 2-{[2-(4-meth-oxy-phen-yl)eth-yl]imino-meth-yl}phenolate groups. One of the three meth-oxy group is disordered over two sets of sites with an occupancy ratio of 0.768 (5):0.232 (5). The crystal packing can be described by alternating zigzag layers of organic ligands and CoN(3)O(3) octa-hedra along the c axis. There are no classical hydrogen bonds in the structure, but C-H⋯π inter-actions occur.
    Acta Crystallographica Section E Structure Reports Online 06/2012; 68(Pt 6):m803-4. · 0.35 Impact Factor
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    ABSTRACT: The asymmetric unit of the title compound, C(18)H(20)N(2)O(4), contains one-half mol-ecule with an inversion center located at the centroid of the mol-ecule. In the crystal, mol-ecules are linked by C-H⋯π inter-actions, forming layers parallel to (101). An intra-molecular O-H⋯N hydrogen bond also occurs.
    Acta Crystallographica Section E Structure Reports Online 06/2012; 68(Pt 6):o1760. DOI:10.1107/S1600536812018405 · 0.35 Impact Factor
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    ABSTRACT: In the title compound, [Co(C16H16NO2)3], the CoIII atom is six-coordinated in an irregular octa­hedral geometry by three N,O-chelating 2-{[2-(4-meth­oxy­phen­yl)eth­yl]imino­meth­yl}phenolate groups. One of the three meth­oxy group is disordered over two sets of sites with an occupancy ratio of 0.768 (5):0.232 (5). The crystal packing can be described by alternating zigzag layers of organic ligands and CoN3O3 octa­hedra along the c axis. There are no classical hydrogen bonds in the structure, but C—H⋯π inter­actions occur.
    Acta Crystallographica Section E Structure Reports Online 05/2012; 68(6). DOI:10.1107/S1600536812023033 · 0.35 Impact Factor
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    ABSTRACT: Mol-ecules of the title compound, C(34)H(38)N(4)O(2), lie across crystallographic inversion centres. The crystal packing can be described by alternating zigzag chains along the c axis in which the molecules are linked by van der Waals interactions. There is an intra-molecular O-H⋯N hydrogen bond and the two benzene rings in the asymmetric unit make a dihedral angle of 79.81 (6)°.
    Acta Crystallographica Section E Structure Reports Online 05/2012; 68(Pt 5):o1562. DOI:10.1107/S1600536812017904 · 0.35 Impact Factor