Yazar "Muradoglu, Vefa" seçeneğine göre listele

Listeleniyor 1 - 4 / 4
  • Küçük Resim Yok
    Öğe
    Heavy-metal extraction capability of chalcogenoic aminophosphines derived from 1-amino-4-methylpiperazine
    (VERSITA, 2013) Sarioz, Ozlem; Surme, Yavuz; Muradoglu, Vefa
    Aminophosphine of the type (Ph2PNHR) derived from 1-amino-4-methylpiperazine and its chalcogen derivatives (Ph2P(X)NHR X = S, Se) were used as ligands in solvent extraction of metal picrates such as Cu2+, Ni2+, and Pb2+ from the aqueous to the organic phase. Influence of parameters such as pH of the aqueous phase, ligand concentration in the organic phase, and concentration of the extractant extracted from the aqueous to the organic phase was investigated to determine the ligands' ability to extract metal ions. Metal picrate extraction was investigated at 25A degrees C using UV-VIS spectrophotometry in dichloromethane in the absence and in the presence of Ph2PNHR and chalcogenides. The extraction results revealed that the extraction percentage of Cu2+, Ni2+, and Pb2+ metals was much higher at lower pH values, indicating an acidity dependent complexation equilibrium.
  • Küçük Resim Yok
    Öğe
    Synthesis and characterization of thermally stable oligomer-metal complexes of copper(II), nickel(II), zinc(II) and cobalt(II) derived from oligo-p-nitrophenylazomethinephenol
    (CHEM SOC ETHIOPIA, 2006) Vural, Ufuk S.; Mart, Hasan; Demir, H. Okkes; Sarioez, Ozlem; Muradoglu, Vefa; Koc, M. Cihangir
    Thermally stable metal complexes based on oligomers were prepared by the reaction between oligo-p-nitrophenilazomethinephenol (ONPAP) and Cu(II), Ni(II), Zn(II) and Co(II) ions. The properties of oligomer-metal complexes were studied by elemental, FT-IR and magnetic moments analyses. The thermal stabilities of the oligomer-metal complexes were compared by thermogravimetric (TG) and differential thermal (DTA) analyses. According to TG, oligomer-metal complexes were stable against to temperature and thermooxidative decomposition. The weight losses of oligomer-metal complexes were found to be 5 and 50 % at 200 and > 850 (Cu(II)), 172 and 600 (Ni(II)), 252 and > 850 (Zn(II)) and 174 and 510 (Co(II)), degrees C, respectively. Based on half degradation temperature parameters Cu(II) and Zn(II) complexes were more resistant than the others.
  • Küçük Resim Yok
    Öğe
    Synthesis and characterization of triethylammonium 2-(diphenylphosphinoamino)-5-methylbenzenesulfonate and use of it as a new complexing agent in solvent extraction of Ni (II) ions from water
    (TAYLOR & FRANCIS INC, 2013) Sarioz, Ozlem; Surme, Yavuz; Muradoglu, Vefa; Malgac, Burcu
    Triethylammonium 2-(diphenylphosphinoamino)-5-methylbenzenesulfonate (2) has been synthesized by treating Ph2PCl with 4-aminotoluene-3-sulfonic acid. The new compound was characterized by IR, H-1- and P-31-NMR, and elemental analysis. Liquid-liquid extraction of Ni (II) ions using synthesized aminophosphine derivative as new extractants was studied. The influence of critical parameters on the extraction properties of aminophosphine derivative such as solution pH and ligand mass were investigated. The liquid-liquid extraction ability of newly synthesized compound has also been compared another aminophosphine derivative (1). UV-vis spectrophotometry used to determine the liquid/liquid extraction efficiencies of Ni (II) metal ions at various conditions. Both of the extractant was found to be efficient for extraction of Ni (II) metal ions with recoveries of 84.8 and 81.5% for ligands 1 and 2 respectively.
  • Küçük Resim Yok
    Öğe
    SYNTHESIS, CHARACTERIZATION AND AB INITIO CALCULATIONS OF AMINOPHOSPHINE DERIVED FROM 4-BENZYLPIPERIDINE, ITS CHALCOGENIDE DERIVATIVES AND MOLYBDENUM(0) COMPLEX
    (TAYLOR & FRANCIS LTD, 2014) Sarioz, Ozlem; Cirak, Cagri; Muradoglu, Vefa; Oznergiz, Sena
    Functionalized monoaminophosphine PPh2NC5H9CH2C6H5 has been synthesized by treating Ph2PCl with 4-benzylpiperidine. The ligand reacts with aqueous hydrogen peroxide, elemental sulfur or selenium to give the corresponding chalcogenides in good yield. The molybdenum complex of the aminophosphine has been obtained. All of the new compounds were obtained in good yields and were characterized by IR, NMR, elemental analysis. Theoretical calculations were carried out by using the Hartree-Fock and density functional methods with the 6-31G(d) basis set. [Supplementary materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements for the following free supplemental files: Additional tables and figures.]