Yazar "Ugras, HI" seçeneğine göre listele

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    Complexation and mutagenicity potential studies with N,N?-bis(2-hydroxynaphthalin-1-carbaldehydene)-1,2-bis-(P-aminophenoxy)ethane and a novel oxovanadium(IV) complex
    (Taylor & Francis Ltd, 2004) Temel, H; Çakir, Ü; Tolan, V; Otludil, B; Ugras, HI
    A new oxovanadium(IV) complex of the Schiff base obtained by condensation of 1,2-bis(p-aminophenoxy)ethane with 2-hydroxynaphthalin-1-carbaldehyde was synthesized. The complex was characterized by elemental analysis, magnetic measurements, mass spectral data, UV-visible and IR spectra. Stability constants and thermodynamic values for complexation between Cu(NO3)(2), Zn(NO3)(2) (.) 6H(2)O, Ni(NO3)(2) (.) 6H(2)O and VOSO4 (.) 5H(2)O and the ligand in 80% dioxane/water were determined by conductance measurements. Ni(II) and Cu(II) complexes of the ligand synthesized by a previously described method were found to be mutagens on strain TA 100 in the presence and absence of S9 mix. These compounds are classified as mutagenic in the Ames test.
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    Spectroscopic and conductance studies of new transition metal complexes with a Schiff base derived from 4-methoxybenzaldehyde and 1,2-bis(p-aminophenoxy)ethane
    (Taylor & Francis Inc, 2003) Çakir, Ü; Temel, H; Ilhan, S; Ugras, HI
    Four new metal complexes of Cu(II), Ni(II), Zn(II) and Co(III) with Schiff base derived from 4-methoxybenzaldehyde and 1,2-bis(p-aminophenoxy)ethane have been prepared and characterized by magnetic susceptibility, conductance measurements, elemental analyses, UV-Vis, H-1 NMR and IR spectra studies. The magnetic and spectroscopic data indicate an octahedral geometry for the six-coordinate complexes. The ligand was used for complexation studies. Stability constants were measured by means of a conductometric method. Furthermore, the stability constants for complexation between ZnCl2, Cu(NO3)(2) and AgNO3 salts and ligand (L) in 80% dioxane-water and pure methanol were determined from conductance measurements. In 80% dioxane-water, the stability constants (log Ke) increase inversely with the crystal radii in the order Ag(I) < Zn(II) < Cu(II).
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    Synthesis and characterization of a novel oxovanadium(IV) complex and conductometric studies with N,N?-bis(salicylidene)-1,2-bis-(p-aminophenoxy)ethane
    (Marcel Dekker Inc, 2004) Temel, H; Akir, U; Ugras, HI
    A new oxovanadium complex of the Schiff base obtained by the condensation of 1,2-bis(p-aminophenoxy)ethane with salicylaldehyde was synthesized. The complex has been characterized by elemental analyses, magnetic measurements, UV-VIS and IR spectra. Stability constants and thermodynamic values for complexation between Cu(NO3)(2), Zn(NO3)(2).6H(2)O, and VOSO4.5H(2)O salts and the ligand synthesized by the method described in the literature in 80% dioxane-water and pure methanol were determined by conductance measurements. The stability constants (log K-c) in 80% dioxane/water decrease in the order Cu(II) > (Zn(II). However, just the opposite behavior has been obtained for these metal complexes with the ligand in methanol (Zn(II) > (Cu(II)). The magnitudes of these ion association constants are related to the nature of solvation of the cation and of the complexed cation. The mobility of the complexes is also dependent, in part, upon solvation effects. Since the mobility of the VO(IV)L complex has been found to be higher than that of VO(IV) ion, assuming that the complex-solvent interaction in the VO(IV)-L systems is comparatively weak. A major consequence of the complexation is the increase in the molar conductivity of the complex and a corresponding large decrease in kappa values. For this reason, it was not obtained any stability constant values for VO(IV)-L systems in two type of solvents.
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    Synthesis and characterization of Zn(II), Cu(II) and Ni(II) complexes with bidentate Schiff base ligands
    (Interperiodica, 2001) Temel, H; Çakir, Ü; Ugras, HI
    The nickel(II), copper(II), and zinc(II) complexes with Schiff bases derived from 1-naphthylarnine and 2-hydroxy naphthaline-1-carbaldehyde (HL) or 1,4-diaminobutane and 4-methoxy benzaldehyde (L') have been prepared. The complexes have been characterized by elemental analysis, magnetic measurements, conductance measurements, H-1 NMR, UV, visible and IR-spectra. Analytical data and conductance spectral and magnetic studies provide evidence of the existence of mononuclear compounds corresponding to a stoichiometry of the M-II : L (1 : 2) type, Furthermore, the conductometric determination of the complexation constant, Ke, of AgNO3, ZnCl2, and Cu(NO3)(2) in 80% dioxane-water in the presence of HL and L' Schiff bases has been investigated. A small complexation constant value was found for the Cu(NO3)(2) with both HL and L' Schiff base ligands.
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    Synthesis and complexation of new substituted dibenzodiaza macrocyclic diester compounds
    (Taylor & Francis Inc, 2002) Topal, G; Temel, H; Çakir, Ü; Ugras, HI; Karadeniz, F; Hosgören, H
    The synthesis of some new precoursers that contain substituted benzo units and their use in the preparation of azama-crocyclic diester compounds are reported. These precoursers and ligands were characterized by Elemental analysis, H-1 and C-13 NMR spectroscopy, and IR spectroscopy. The complexation constants Ke and DeltaGdegrees values for the diesters with several transition metal cations (Ag+, Zn2+ and Cu2+) in a dioxan-water system using a conductometric method at 25degreesC are also reported.
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    The synthesis, characterization and conductance studies of new Cu(II), Ni(II) and Zn(II) complexes with the Schiff base derived from 1,2-bis-(o-aminophenoxy)ethane and salicylaldehyde
    (Taylor & Francis Ltd, 2003) Temel, H; Çakir, Ü; Ugras, HI; Sekerci, M
    Cu(II), Ni(II) and Zn(II) complexes with the Schiff base derived from 1,2-bis-(omicron-aminophenoxy)ethane with salicylaidehyde have been prepared. The complexes have been characterized by elemental analysis, magnetic measurements, H-1 NMR, C NMR, UV, visible and IR spectra as well as conductance measurements. The ligand is coordinated to the central metal as a tetradentate ONNO ligand. The four bonding sites are the central azomethine nitrogen and aldehydic OH groups. The ligand was used for complexation studies. Stability constants were measured by a conductometric method. Furthermore, the stability constants for complexation between ZnCl2 and Cu(NO3)(2) salts and N,N'-bis(salicylidene)-1,2-bis-(omicron-aminophenoxy)-ethane (H2L) in 80% dioxane/water and pure methanol were determined from conductance measurements. The magnitudes of these ion association constants are related to the nature of the solvation of the cation and the complexed cation. The mobilities of the complexes are also dependent, in part, upon solvation effects.
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    Synthesis, spectral and biological studies of Mn(II), Ni(II), Cu(II), and Zn(II) complexes with a tetradentate Schiff base ligand.: Complexation studies and the determination of stability constants (Ke)
    (Taylor & Francis Inc, 2001) Temel, H; Çakir, Ü; Otludil, B; Ugras, HI
    The complexes Mn(II), Ni(II), Cu(II) and Zn(H) ions with a N2O2 Schiff base derived from 1,4-diaminobutane and salicylaldehyde, N,N'-bis(salicylidene)-1,4-diaminobutane (LH2), have been prepared and characterized by elemental analyses, molar conductivities, spectral (IR, NMR, visible, UV) and magnetic moment measurements. Stability constants were measured by means of a conductometric method. Furthermore, the stability constants for complexation between ZnCl2, Cu(NO3)(2) and AgNO3 salts and the ligand in 80% dioxane-water and pure methanol were determined by conductance measurements. The magnitudes of these ion association constants are related to the nature of the solvation of the cation and the complexed cation. The mobilities of the complexes are also dependent, in part, upon solvation effects. The complexes Mn(II), Ni(II), Cu(II) and Zn(II) ions with the Schiff base have been evaluated for their antibacterial activity against rec(-)and rec(+) stains of Bacillus subtilis.