Yazar "Keypour, Hassan" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • Küçük Resim
    Öğe
    New macrocyclic schiff base complexes incorporating a homopiperazine unit: Synthesis of some Co(II), Ni(II),Cu(II) and Zn(II) complexes and crystal structure and theoretical studies
    (Elsevier Science Bv, 2016) Keypour, Hassan; Rezaeivala, Majid; Ramezani-Aktij, Ameneh; Bayat, Mehdi; Dilek, Nefise; Ünver, Huseyin
    A new macrocyclic Schiff base ligand, L, was synthesized by condensation reaction of 1,4-bis(2-formylphenyl)homopiperazine and 1,4-diaminobutane in acetonitrile. The Schiff base ligand was characterized by using elemental analyses, FT-IR, H-1, C-13 NMR and mass spectroscopic techniques. The metal (II) complexes [ML], were synthesized from the reaction of MCl2 center dot nH(2)O (M: Co, Ni, Cu and Zn) with Schiff base ligand, L and characterized by elemental analyses and FT-IR. X-ray crystal structure of [CoLCl](+) distorted square pyramidal geometry with an N4Cl core, arising from coordination by the four donor nitrogen atoms from the macrocyclic framework and one Cl atom. It crystallizes triclinic space group, P-1 with a = 7.1777(1) angstrom, b = 11.0357 (2) angstrom, c = 15.1520(2) angstrom, V = 1183.14(3), Z = 2, D-c = 1.556 g cm(-3), mu (MoK alpha) = 0.156 mm(-1). Also, the bonding situation between the [MCl](+) and Ligand (L) fragments in [MLCl]ClO4 (M = Co(II), Ni(II), Cu(II), Zn(II)) complexes were carried out by energy-decomposition analysis (EDA). The results showed that there is an increasing trend in the case of Delta E-elstat of the complexes by changing the M from Co(II) to Zn(II). (C) 2016 Elsevier B.V. All rights reserved.
  • [ X ]
    Öğe
    Probing the effect of arm length and inter- and intramolecular interactions in the formation of Cu(II) complexes of Schiff base ligands derived from some unsymmetrical tripodal amines
    (ROYAL SOC CHEMISTRY, 2015) Keypour, Hassan; Shayesteh, Maryam; Salehzadeh, Sadegh; Dhers, Sebastien; Maleki, Farahnaz; Unver, Huseyin; Dilek, Nefise
    The syntheses of two previously known, 2-((2-aminoethyl)(pyridin-2-ylmethyl) amino) ethanol (1) and 2-((3-aminopropyl)(pyridin-2-ylmethyl) amino) ethanol (2), and four new unsymmetrical N-capped tripodal amines, 2-((4-aminobutyl)(pyridin-2-ylmethyl) amino) ethanol (3), 3-((2-aminoethyl)(pyridin-2-ylmethyl)amino)-propan-1-ol (4), 3-((3-aminopropyl)(pyridin-2-ylmethyl) amino) propan-1-ol (5) and 3-((4-aminobutyl)(pyridin-2-ylmethyl) amino) propan-1-ol (6), are reported. The ligands (3-4) feature a longer arm, 3-hydroxypropyl or butylamino, than in the analogues previously employed (2-hydroxyethyl arm, ethylamino-arm or propylamino-arm in 1 and 2). All six tripodal amines, 1-6, are equipped with a 2-methylpyridyl-arm and either an ethylamino-arm (1 and 4), propylamino-arm (2 and 5) or butylamino-arm (3 and 6). The new amines, 3-6, have been employed in one pot condensation reactions with 2-hydroxy-1-naphthaldehyde and salicylaldehyde (and its derivatives) in the presence of Cu(II) metal ions to generate a series of new mononuclear complexes, [(MLaldi)-L-parallel to](ClO4) as well as new dinuclear complexes [(CuLaldi)-L-parallel to](2)(ClO4)(2) of new ligands L-aldi. Four monomeric complexes and one dimeric complex have been characterised by single crystal X-ray diffraction, revealing a distorted square-pyramidal copper(II) ion. A general comparison between these structures shows that the number and types of chelate ring sequences around the metal ions are important in the formation of structures. Theoretical studies show that the 3-hydroxypropyl arm in these complexes is a weak coordinating group and it can readily be removed from the coordination sphere of metal ions, resulting in a dimerised four coordinate complex. Calculations show that the interaction between the two monomeric fragments is very weak.
  • Küçük Resim
    Öğe
    Synthesis and characterization of Co(II), Ni(II), Cu(II) and Zn(II) complexes with a new homopiperazine macrocyclic Schiff base ligand
    (Elsevier, 2015) Keypour, Hassan; Rezaeivala, Majid; Mirzaei-Monsef, Misagh; Sayın, Koray; Dilek, Nefise; Ünver, Hüseyin
    A new macrocyclic Schiff-base ligand, L, was synthesized by condensation reaction of 1,4-bis(2-formylphenyl) homopiperazine and 1,3-diaminopropane in acetonitrile. The Schiff-base ligand was characterized by using elemental analyses, IR, and mass spectroscopic techniques. Four new Ni(II), Cu(II), Co(II) and Zn(II) complexes of ligand, [NiLCl]ClO4, [CuLCl](ClO4), [CoLCl]ClO4 and [ZnLCl]ClO4 were prepared and characterized by elemental analyses and IR spectroscopy. X-ray crystal structure of [ZnLCl]ClO4 showed that the complex contains Zn(II) in a distorted square pyramidal geometry with a N4Cl core. In addition, structural parameters, vibration frequencies, frontier molecular orbitals (FMOs), UV bands and biological activity ranking of mentioned complexes are investigated as theoretically for all complexes. Computational studies of the relevant complexes are performed with the aid of density functional theory (DFT). (C) 2015 Elsevier B.V. All rights reserved.