Djouhra Aggoun

Ferhat Abbas University of Setif, Satif, Sétif, Algeria

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Publications (12)16.16 Total impact

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    ABSTRACT: A new tetradentate cobalt(II)-Schiff base complex has been synthesized via the reaction of the ligand 2,2’-((1E,1’E)-(ethane-1,2-diylbis(azanylylidene))bis(ethan-1-yl-1-ylidene))bis(4-((methyl(phenyl)amino)methyl)phenol) with a stoichiometric amount of cobalt(II) acetate tetrahydrate in absolute ethanol. This cobalt(II) complex has been characterized with the aid of several spectroscopic techniques (FT-IR, UV-Vis, and mass spectrometry) as well as by thermal (TGA and DTA) and elemental analysis. Cyclic voltammetry has been employed to examine the redox behavior of the cobalt(II) complex in dimethylformamide (DMF) containing 0.10 M tetra-n-butylammonium tetrafluoroborate (TBABF4). In addition, the electrogenerated cobalt(I) form of the complex has been (a) employed as a catalyst for the reduction of 1-iododecane and (b) compared with the behavior of cobalt(I) salen. Finally, the cobalt(II) complex has been subjected to anodic electropolymerization onto the surface of a glassy carbon electrode in DMF containing 0.10 M tetra-n-butylammonium perchlorate (TBAP).
    Polyhedron 05/2015; 97. DOI:10.1016/j.poly.2015.05.025 · 2.05 Impact Factor
  • Ali Ourari · Djouhra Aggoun
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    ABSTRACT: Abstract Three dihydroxylated acetophenone derivatives 2,6-(1a), 2,5-(2a), and 2,4-dihydroxyacetophenone (3a) were O-monoalkylated at moderate temperature (50 °C) using 3-bromopropyl-N-pyrrole. These monomers 6-(3′-N-pyrrolpropoxy)-2-hydroxyacetophenone (1b), 5-(3′-N-pyrrolpropoxy)-2-hydroxyacetophenone (2b), and 4-(3′-N-pyrrolpropoxy)-2-hydroxy acetophenone (3b) were isolated with acceptable yields (59-70 %). Their characterization was carried out with usual spectroscopic methods such as UV-vis, FTIR, NMR1H, 13C, Dept135, and elemental analysis. These pyrrolic compounds were deliberately chosen as electropolymerizable monomers to elaborate poly(pyrrole) films containing metallic centers useful as redox mediators covalently grafted on the surfaces of modified electrodes. Accordingly, we have initiated the synthesis of an original pyrrole-Ni(II)-Schiff base complex derived from 2,6-(1b) and 1,2-diaminoethane. This pyrrolic complex was electropolymerized onto glassy carbon (GC), platinum disk (Pt), and indium tin oxide (ITO) electrode surfaces. This electropolymerization was performed in acetonitrile via anodic oxidation of pyrrolic moieties by cyclic voltammetry. The efficiency of the electrochemical polymerization was investigated as a function of several parameters such as the nature of the electrode material, the number of voltammetric scans, and the scan rate dependence. The electrodeposited poly(pyrrole) films onto ITO surface was characterized by X-ray diffraction (XRD) and atomic force microscopy (AFM). This poly(pyrrole) matrix, containing metallic centers, was found to have good catalytic properties towards the reduction of iodobenzene and carbon dioxide CO2. Graphical abstract
    Journal of the Iranian Chemical Society 01/2015; DOI:10.1007/s13738-015-0664-2 · 1.41 Impact Factor
  • Ali Ourari · Djouhra Aggoun · Lahcène Ouahab
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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: 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
  • Ali Ourari · Djouhra Aggoun · Lahcene Ouahab
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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 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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    A. Ourari · W. Derafa · S. Bouacida · D. Aggoun · J.-C. Daran
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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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    Ali Ourari · Nawel Bounab · Sofiane Bouacida · Djouhra Aggoun
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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 · 4.50 Impact Factor
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    Ali Ourari · Djouhra Aggoun · Sofiane Bouacida
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    ABSTRACT: In the title compound, C(15)H(17)NO(3), the mean planes of the pyrrole and benzene rings form a dihedral angle of 81.92 (7)°. The mol-ecule contains an intra-molecular O-H⋯O hydrogen bond. In the crystal, weak C-H⋯π inter-actions link the mol-ecules into chains along [010].
    Acta Crystallographica Section E Structure Reports Online 04/2012; 68(Pt 4):o1083. DOI:10.1107/S1600536812010641 · 0.35 Impact Factor
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    Ali Ourari · Wassila Derafa · Sofiane Bouacida · Djouhra Aggoun
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    ABSTRACT: In the title compound, {[Cu(C(10)H(13)N(2)O(3))(C(5)H(5)N)]ClO(4)}(n), the Cu(II) atom has an N(3)O(2) coordination sphere. The complex contains two different ligands, viz. a pyridine mol-ecule and a Schiff base mol-ecule, resulting from the condensation of ethyl-enodiamine with dehydro-acetic acid. The Cu(II) atom exhibits a square-pyramidal geometry: three of the four donors of the pyramid base belong to the Schiff base ligand (an N atom from the amine group, a second N atom from the imine group and the O atom of the pyran-one residue) and the fourth donor is the pyridine N atom. The coordination around the metal ion is completed by a longer axial bond to the pyran-one O atom of an adjacent Schiff base, so forming a one-dimensional polymer. The complex has a +1 charge that is compensated by a perchlorate ion. The crystal packing, which can be described as alternating chains of cations and tetra-hedral perchlorate anions along the a axis, is stabilized by inter-molecular N-H⋯O, C-H⋯O and C-H⋯N hydrogen-bonding interactions.
    Acta Crystallographica Section E Structure Reports Online 12/2011; 67(Pt 12):m1720-1. DOI:10.1107/S1600536811046411 · 0.35 Impact Factor
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    ABSTRACT: Salicylaldehyde, 2-hydroxyacetophenone, and 3,5-dichlorosalicylaldehyde react with 1,2-diaminoethane to give three symmetrical Schiff bases H2L1, H2L2, and H2L3, respectively. With Ru(III) ions, these ligands lead to three complexes: Ru(III)ClL1 ( 1 ), Ru(III)ClL2 ( 2 ), and Ru(III)ClL3 ( 3 ). The purity of these compounds was estimated by TLC technique and microanalysis while their structures were supported by the usual spectroscopic methods such as NMR, infrared, and electronic spectra. The cyclic voltammetry in acetonitrile showed irreversible waves for all three ligands. Under the same experimental conditions, it was proved that the ruthenium is coordinated in the three complexes 1 , 2 , and 3 showing quasireversible redox systems. The behavior of these complexes and their comparison with cytochrome P450 are investigated using them as catalysts in the presence of molecular oxygen with an apical nitrogen base: 1- or 2-methylimidazole.
    Advances in Physical Chemistry 01/2011; 2011(1687-7985). DOI:10.1155/2011/157484