Yazar "Turac E." seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim Yok
    Öğe
    Environmentally friendly enzyme-catalyzed polymerization of a novel phenoxy-ketimine
    (Gh. Asachi Technical University of Iasi, 2017) Tapan S.; Sahmetlioglu E.; Demir H.O.; Turac E.; Sahin E.
    The monomer with ketimine side group, 2-(l-(benzylimino)ethyl)phenol (2-BEP), was synthesized from the condensation of 2-hydroxyacetophenone and benzyl amine. The enzymatic oxidative polymerization of 2-BEP was performed in the presence of hydrogen peroxide using horseradish peroxidase (HRP) as catalyst. The oxidation reaction was carried out in various solvents and phosphate buffers at room temperature. These studies have shown that a dark brown polymer was successfully synthesized by utilizing aqueous methanol as the cosolvent at pH 7.0. Poly(2-BEP) shows good solubility in DMF and DMSO, but it is insoluble in THF, methanol, water, acetone and chloroform. Characterization of poly(2-BEP) was carried out via UV-vis, FT-IR,1H-NMR,13C-NMR and GPC techniques. The number-average molecular weight (Mn), weight-average molecular weight (Mw) and polydispersity index (PDI) of the polymer were determined to be 1157.4 g mol-1, 2039.6 g mol-1 and 1.76, respectively. FT-IR and1H-NMR studies confirmed the presence of phenylene and oxyphenylene units within the polymer backbone. The optical band gaps (Eg) of 2-BEP and poly (2-BEP) were calculated as4.10 eV and 3.86 eV, respectively. © 2017, Gh. Asachi Technical University of Iasi. All rights reserved.
  • Küçük Resim Yok
    Öğe
    Synthesis and characterization of water-soluble oligosalicylaldehyde- sulfanilic acid and its Cu(II), Co(II), Pb(II) complexes
    (2008) Turac E.; Surme Y.; Sahmetlioglu E.; Varol R.; Narin I.; Toppare L.
    This work presents the synthesis and characterization of a new water-soluble oligophenol derivative, 4-(2-hydroxybenzylideneamino) benzenesulfanilic acid (OSAL-SA) and its metal complexes. The chemical structure of the water-soluble polymer was characterized by nuclear magnetic resonance (1H NMR) and Fourier transform infrared (FTIR) spectroscopies and thermogravimetric analyses (TGAs). Pb(II), Cu(II), Co(II) complexes of the polymer were also synthesized in methanol. Characteriza tions of water insoluble polymer-metal complexes were performed by FTIR, flame atomic absorption spectroscopy, and TGA. The conductivity measurements of OSAL-SA and polymer-metal complexes were carried out by the four-probe technique. © 2008 Wiley Periodicals, Inc.