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    Spectroscopic and structural properties of N-(acetamide) morpholinium bromide
    (Pergamon-Elsevier Science Ltd, 2011) Baran, Yakup; Ozay, Hava; Esener, Hasan; Turkyilmaz, Murat
    A new crystal of N-(acetamide) morpholinium (NAM) bromide has been prepared in methanol at room temperature and characterized by single crystal X-ray analysis, elemental analysis, GS-MS, FUR, NMR((1)H, (13)C, DEPTH and HETCOR). The N-(acetamide) morpholinium crystallizes in the orthorhombic crystal system, Pnma with unit cell a = 12.798(9) angstrom, b = 7.222(5) angstrom, c = 9.244(5) angstrom, beta = 90.00, V = 854.4(9) angstrom(3), Z = 4. The X-ray structure determination revealed that there are strong inner and intermolecular hydrogen bonds in the crystal. (C) 2011 Elsevier B.V. All rights reserved.
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    Structure, spectroscopic, magnetic, fluorescence, and thermal studies of bis(perchlorate)tetrakis(pyrazole)copper(II)
    (2011) Baran, Yakup; Esener, Hasan; Turkyilmaz, Murat
    The complex bis(perchlorate)tetrakis(pyrazole)copper(II) has been prepared and characterized by single crystal X-ray analysis, FT-IR, UV-VIS spectroscopy and thermal methods. [Cu(ClO4)2(pyzl)4] crystallizes in the monoclinic system, space group C2/c, with a = 14.5186(11), b = 9.9513(7), c = 15.8564(11) Å, ? = 115.5290(10)° V = 2067.2(3) Å3 and z = 4. The molecular and crystal structure are stabilized by inter and intra molecular hydrogen bonds. The complex formation kinetics was studied at 310 nm. The activation parameters of the complex formation kinetics were determined as, ?H#: 200 kJ/mol, ?S#: 268 J/K. mol. The FT-IR spectra has been measured and assigned in the range of 4000-400 cm-1. The Cl-O and N-H stretching vibrations confirms the presence of intramolecular hydrogen bonds. The magnetic moment of the complex was found to be 1.73 BM. The fluorescence quenching of pyrazole by Copper(II) was also studied in methanol. Copyright © Taylor & Francis Group, LLC.
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    Synthetic, structural, spectroscopic, and stopped-flow kinetic investigation of imine production
    (Sage Publications Ltd, 2011) Baran, Yakup; Ozay, Hava; Esener, Hasan
    Synthetic and formation kinetics studies have been made of imine production from the reaction of 3-methyl-2-thiophenecarboxyaldehyde with 3-(1H-imidazol-1-yl) propan-1-amine (L-1), 1-(3-aminopropyl) pyrolidin-2-one (L-2), 2-piperazin-1-ylethanamine (L-3) and 2-hydrazinopyridine (L-4). Kinetics were determined by rapid reaction techniques using absorbance changes at multi wavelengths in methanol. Activation enthalpies for imine formation in methanol vary from 101 to 121 kJ mol(-1) and entropies of activation (DS not equal) vary from -98 to -188 J K-1 mol(-1). All of these observations are indicative of an S(N)2 mechanism. Activation parameters of the reactions were calculated under second-order reaction conditions. The analysis of kinetic data in solutions was performed with the SPECFIT/32 software package which provides useful information on the binding characteristics of functional groups and mechanism of the reactions. The crystal structure of 3-methylthiophene-2-carbaldehyde pyridine-2-ylhydrazone is described.