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    Öğe
    Piridin birimleri içeren imin polimerlerinin sentezi ve karakterizasyonu
    (Çanakkale Onsekiz Mart Üniversitesi, 2010) Daban, Sevil; Kaya, İsmet
    o-Vanilinin bazik ortamda yükseltgen olarak NaOCl kullanılarak oksidatif polikondenzasyon reaksiyonu ile oligo-orto-vanilin (OVAN) sentezlendi. OVAN ile 2-amino-5-brompiridin ve 2-amino-5-klorpiridinin aşılama tepkimesi sonucu oligo-[2-(5-brompiridin-2-il-imino)metil-6-metoksifenol] ve poli-[2-(5-klorpiridin-2-il-imino)metil-6-metoksifenol]'ün sentezi gerçekleştirildi. Piridin birimi içeren aminler ile salisilaldehit'in reaksiyonu sonucu elde edilen Schiff bazları ve bu Schiff bazlarından 2-[(5-brompiridin-2-il-imino)metil]fenol ile 2-[(5-klorpiridin-2-il-imino)metil]fenol'ün bakır(II) ve kobalt(II) tuzları ile oluşturdukları Schiff bazı-metal kompleksleri sentezlendi. Sentezlenen bileşiklerin yapı ve özellikleri çeşitli spektral ve elektrokimyasal yöntemler ile karakterize edildi. Sentezlenen tüm bileşiklerin termal özellikleri TGA-DTA-DSC analizleri ile belirlendi. Elde edilen oligomerlerin ve polimerin molekül ağırlığı SEC ölçümlerinden tayin edildi.
  • Küçük Resim
    Öğe
    Synthesis and characterization of Schiff base, Co(II) and Cu(II) metal complexes and poly(phenoxy-imine)s containing pyridine unit
    (Elsevier S.A., 2021) Kaya, İsmet; Daban, Sevil; Şenol, Dilek
    In the first stage, two different Schiff base ligands were prepared by the condensation of 2-amino-5-bromopyridine and 2-amino-5-chloropyridine with salicylaldehyde in methanol at the molar ratio of 1:1. Ligands: C12H9ON2Br (L1), C12H9ON2Cl (L2). In the second stage, four different metal complexes were obtained from Schiff bases with Co(OAc)2·4H2O and Cu(OAc)2·2H2O Molecular formulas of the metal complexes obtained were [Co2(L1)2(H2O)(OCH3)]H2O, [Cu2(L1)2(H2O)(OCH3)]H2O, [Co2(L2)2(H2O)(OCH3)]H2O and [Cu2(L2)2(H2O)(OCH3)] H2O. In the third stage, ortho-vanillin (VAN) was polymerized via oxidative polycondensation in aqueous alkaline medium with air as oxidant. Then, poly(phenoxy-imine)s were synthesized from condensation reactions of poly (ortho-vanillin) (PVAN) with 2-amino-5-bromopyridine and 2-amino-5-chloropyridine in THF medium at 60 °C. All synthesized compounds were characterized by spectral and electrochemical techniques. Thermal properties of the compounds were determined by TGA-DTA and DSC analyses. The molecular weights of the polymers were calculated from SEC analyses. Poly[2-((5-bromopyridin-2-yl-imino)methyl)-6-methoxyphenol] (PVANBr) and poly[2-((5-chloropyridin-2-yl-imino)methyl)-6-methoxyphenol] (PVANCl) were determined to have electrical conductivity of 10−3 S cm−1. Electrochemical band gaps (Eg’) of PVANBr and PVANCl were calculated as 2.10 and 1.95 eV, respectively. Initial decomposition temperatures of [Co2(L1)2(H2O)(OCH3)]H2O, [Cu2(L1)2(H2O)(OCH3)]H2O, [Co2(L2)2(H2O)(OCH3)]H2O and [Cu2(L2)2(H2O)(OCH3)]H2O were found to be 309, 271, 305 and 259 °C, respectively.