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    Öğe
    Immobilization of salophen derivative Schiff base cobalt(II) complex on a copolymer coated platinum electrode and electrocatalytic investigations
    (Bulgarian Acad Science, 2016) Cakmak, D.; Yalcinkaya, S.; Seymen, K.; Demetgul, C.
    In this study, o-amino-benzylalcohol (pBA) and o-anisidine (pA) homopolymers and their copolymer (o-aminobenzylalcohol- co-o-anisidine) (Cp) were synthesized on the platinum electrode in 0.5 M H2SO4 as a supporting electrolyte medium by electrochemical methods. Then, Co(II) complex of salophen type Schiff base (CoL) was immobilized on these polymer coated electrode surfaces in acetonitrile containing 0.15 M LiClO4. The prepared modified surfaces were characterized by Cyclic Voltammetry, UV-Vis, SEM-EDAX and ICP-MS techniques. The electrocatalytic activity of modified electrodes was investigated on electrooxidation of Dopamine (DA) as biosensor application. One of the prepared modified electrodes showed good electrocatalytic effect on the oxidation of DA using Square Wave Voltammetry method (SWV). The oxidation peak current of DA increased linearly in the range of 0.2 mu M - 2 mM in pH 7 phosphate buffer solution at left perpendicular CoL right perpendicular immobilized pA modified Platinum electrode. Limit of Detection (LOD) was calculated as 0.1 mu M for DA determination.
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    Öğe
    Metal complexes of perimidine and Schiff base ligands bearing both naphthalene and chromone moieties: synthesis and catalytic activity
    (Bulgarian Acad Science, 2017) Beyazit, N.; Cobanoglu, S.; Demetgul, C.
    A new perimidine and a new Schiff base compounds were prepared by the condensation of visnagin derivative containing a carbonyl group with 1,8-diaminonaphthalene (1,8-DAN) and 2,3-diaminonaphthalene (2,3-DAN), respectively. Metal complexes of these chromone type ligands were also isolated by using the Cu(II) and Fe(II) ions. The synthesized compounds were characterized by UV-Vis, FT-IR, H-1&C-13 NMR, mass spectrometry, elemental and AAS analyses and also magnetic susceptibility and molar conductivity measurements. Catecholase activity of the complexes was investigated in methanol medium using 3,5-di-tert-butylcatechol (3,5-DTBC) as model substrate and the results showed that all complexes are active for catalyzing the oxidation of 3,5-DTBC to the corresponding quinone with first order reaction kinetics. Fe(II) complex of Schiff base ligand has been found to exhibit the best catecholase activity with a turnover number value of 890.1 h(-1).