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Bilici A.,Control Laboratory of Agricultural and Forestry Ministry | Kaya I.,Canakkale Onsekiz Mart University | Sacak M.,Ankara University
Journal of Inorganic and Organometallic Polymers and Materials | Year: 2010

This article describes the synthesis and some properties of a new phenol-based Schiff base oligomer and its metal complexes. First, Schiff base monomer, 2,3-bis[(2-hydroxy-naphtyl)methylene]diaminopyridine (HNMDAP) was synthesized by condensation of 2-hydroxy-1-naphtaldehyde with 2,3-diaminopyridine. Then, HNMDAP was oxidized to give its corresponding oligomer (OHNMDAP) in the presence of the oxidants such as H 2O 2, NaOCl and air in alkaline medium. Finally, OHNMDAP was converted into the chelates of some divalent metals. The resulting compounds were characterized by spectral (UV-vis and IR), thermal (TG), electrochemical (CV) techniques in addition to conductivity measurements. Both HNMDAP and OHNMDAP were also tested by some selected bacteria in vitro medium. © Springer Science+Business Media, LLC 2009.

Bilici A.,Control Laboratory of Agricultural and Forestry Ministry | Kaya T.,Canakkale Onsekiz Mart University | Yildirim M.,Canakkale Onsekiz Mart University | Dogan F.,Canakkale Onsekiz Mart University
Journal of Molecular Catalysis B: Enzymatic | Year: 2010

Up to date, enzymatic polymerization of phenolic compounds bearing different moieties such as ferrocene, sugar, furamide, and male-imide have been reported. In this study, horseradish peroxidase (HRP)-catalyzed polymerization of another hydroxy substituted aromatic compound, 2-hydroxycarbazole (HC), was firstly presented. The structure of the polymer (PHC) was verified by using nuclear magnetic resonance and infrared techniques. Further characterization was carried out by means of TG, DSC, CV (cyclic voltammetry), SEM (scanning electron microscopy), fluorescence analyses, and solid state conductivity measurements. Average molecular weight of the polymer was determined by gel permeation chromatography and was around two thousands. The optical and electrochemical band gaps of PHC were dramatically lower than those of HC. The photochemical behaviors of HC and PHC were investigated by recording the fluorescence spectra in two different solvents. Solid state conductivity measurement showed that the electrical conductivity value of hydroxyl-functionalized carbazole polymer is relatively higher than those of the previously reported phenol polymers in the literature. Moreover, the conductivity of PHC increased by doping with iodine vapour. © 2010 Elsevier B.V.

Bilici A.,Control Laboratory of Agricultural and Forestry Ministry | Kaya I.,Canakkale Onsekiz Mart University | Senol D.,Canakkale Onsekiz Mart University
Polymers for Advanced Technologies | Year: 2011

Catalytic oxidative polymerization (OP) of 4,4'-(fluorene-9,9-di-yl)diphenol (FDP), possessing both phenol and fluorene rings in its structure, was carried out in different organic solvents. Schiff base polymer-copper (II) complex and hydrogen peroxide were used as a catalyst and an oxidizing agent, respectively. The structure of poly (4,4'-(fluorene-9,9-di-yl)diphenol) (PFDP) was confirmed by UV-vis, FT-IR, NMR spectroscopies. Further characterization was conducted by means of thermogravimetric analysis (TGA), DSC, XRD, scanning electron microscopy (SEM), cyclic voltammetry (CV), and conductivity measurements. PFDP showed the optical band gap of 3.09eV, the emission maximum at 335nm, and the HOMO level of -5.75eV. © 2010 John Wiley & Sons, Ltd.

Dilek D.,Canakkale Onsekiz Mart University | Doan F.,Canakkale Onsekiz Mart University | Bilici A.,Control Laboratory of Agricultural and Forestry Ministry | Kaya I.,Canakkale Onsekiz Mart University
Thermochimica Acta | Year: 2011

In here, the facile synthesis and thermal characterization of a novel polyphenol containing Schiff base pendant group, poly(4-{[(4-hydroxyphenyl) imino]methyl}benzene-1,2,3-triol) [PHPIMB], are reported. UV-vis, FT-IR, 1H NMR, 13C NMR, GPC, TG/DTG-DTA, CV (cyclic voltammetry) and solid state conductivity measurements were utilized to characterize the obtained monomer and polymer. The spectral analyses results showed that PHPIMB was composed of polyphenol main chains containing Schiff base pendant side groups. Thermal properties of the polymer were investigated by thermogravimetric analyses under a nitrogen atmosphere. Five methods were used to study the thermal decomposition of PHPIMB at different heating rate and the results obtained by using all the kinetic methods were compared with each other. The thermal decomposition of PHPIMB was found to be a simple process composed of three stages. These investigated methods were those of Flynn-Wall-Ozawa (FWO), Tang, Kissinger-Akahira-Sunose (KAS), Friedman and Kissinger methods. © 2011 Elsevier B.V.

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