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    Enol-imine/keto-amine tautomerism of (E)-4-[(2-hydroxybenzylidene)amino]phenyl benzenesulfonate
    (Int Union Crystallography, 2016) Dincer, Muharrem; Ozdemir, Namik; Kagit, Reyhan; Dayan, Osman
    [Anstract Not Available]
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    Investigation of enol-imine/keto-amine tautomerism in (E)-4-[(2-hydroxybenzylidene)amino]phenyl benzenesulphonate by experimental and molecular modelling methods
    (Taylor & Francis Ltd, 2016) Ozdemir, Namik; Kagit, Reyhan; Dayan, Osman
    The Schiff base compound (E)-4-[(2-hydroxybenzylidene)amino]phenyl benzenesulphonate has been synthesised from the reaction of 4-aminophenyl benzenesulphonate and salicylaldehyde, and characterised by spectroscopic and single-crystal X-ray diffraction techniques. Quantum chemical calculations employing density functional theory method with the 6-311++G(d,p) basis set were performed to study the molecular, spectroscopic and enol-imine/keto-amine tautomerisation mechanism of the title compound. An acceptable correlation between experimental and theoretical findings is obtained. Enol-imine/keto-amine tautomerisation mechanism was investigated in the gas phase and in solution phase using the polarisable continuum model approximation. The energetic and thermodynamic parameters of the enol-imine -> keto-amine transfer process show that the single proton exchange is unfavoured in all cases. Contrarily, the reverse reaction seems to be feasible with a very low barrier height and is supported by negative values in enthalpy and free energy changes for all cases.
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    Novel hexapodal triazole linked to a cyclophosphazene core rhodamine-based chemosensor for selective determination of Hg2+ ions
    (Springer/Plenum Publishers, 2014) Ozay, Hava; Kagit, Reyhan; Yildirim, Mehmet; Yesilot, Serkan; Özay, Özgür
    The hexapodal Rhodamine B derivative compound 3 containing a cyclotriphosphazene core was synthesized and characterized by spectroscopic techniques such as FT-IR, H-1, C-13 and P-31 NMR, HR-MS, MALDI MS and microanalysis. Compound 3 is a naked eye selective sensor with colorimetric and fluorescent properties for Hg2+ ions in the presence of other metal ions such as Na+, K+, Ca2+, Ba2+, Mg2+, Ag+, Mn2+, Cu2+, Ni2+, Co2+, Pb2+, Cd2+, Zn2+, Fe2+, Fe3+, and Cr3+. The optical sensor properties of compound 3 were investigated using UV-vis and fluorescence spectroscopy. The lowest detection limit of compound 3 was determined as 3.76 x 10(-9) M (0.75 ppb) for Hg2+ ions. The stoichiometry of compound 3-Hg2+ complex was found to be 1:3 (ligand/metal ion). The reusable test strip was improved by the immobilization of compound 3 into a hydrogel network. The reusability of the sensor and test strip was tested with S2- ion solutions.
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    Palladium(II) and Ruthenium(II) complexes bearing arylsulfonate based ligands: Synthesis, structural characterization and catalytic properties
    (Pergamon-Elsevier Science Ltd, 2016) Kagit, Reyhan; Dayan, Osman; Ozdemir, Nannk
    In this paper, a series of 4-aminophenyl arylsulfonates (L1-3) and their Schiff bases (L4-6) were synthesized. [Ru(p-cymene)(L1-3)Cl-2] (K1-3), trans-[Pd(L4-6)(2)] (K4-6), and [Ru(p-cymene)(4-aminophenol)Cl-2] (K7) type transition metal complexes have been prepared from the reaction of the appropriate metal salt, L1-6 and 4-aminophenol. All compounds characterized with different techniques like C, H, N analysis, NMR, IR and UV-vis techniques. Solid-state structures of one Ru(II) complex (K1) and one Pd(II) complex (K6) have been determined by single-crystal X-ray diffraction. The complexes K1-7 have been tested as catalysts for the catalytic oxidation of benzyl alcohol to bezaldehyde in the presence of periodic acid (H5IO6). The results show that Ru(II) complexes are more active catalysts than Pd(II) catalysts for this reaction under worked conditions. (C) 2016 Elsevier Ltd. All rights reserved.
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    Phosphazene Based Multicentered Naked-Eye Fluorescent Sensor with High Selectivity for Fe3+ Ions
    (Amer Chemical Soc, 2014) Kagit, Reyhan; Yildirim, Mehmet; Özay, Özgür; Yesilot, Serkan; Ozay, Hava
    A novel on/off fluorescent rhodamine-based hexapodal Fe3+ probe (L) containing a cyclotriphosphazene core was synthesized by an azide-alkyne click-reaction. The synthesized compounds (1-5 and L) were characterized by FT-IR; H-1, C-13, and P-31 NMR; and MALDI MS spectrometry. The optical sensor features for the Fe3+ complex of L were investigated by UV-vis and fluorescence spectroscopy. The stoichiometry of L-Fe3+ complex was found to be 1:3 (ligand/metal ion), and the detection limit of L was determined as 4.8 mu M (0.27 mg L-1) for Fe3+ ions. The reusability of the sensor was tested by the addition of ethylenediamine to L-Fe3+ complex solutions followed by the addition of Fe3+ solution.