Yazar "Temel H." seçeneğine göre listele

Listeleniyor 1 - 11 / 11
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    Characterization and spectrophotometric studies of new Cu(II), Ni(II), Zn(II) complexes with schiff base derived from 1,2-bis-(o-aminophenoxy)ethane and salicylaldehyde
    (2005) Aydin H.; Ziyadanoğullari B.; Temel H.
    The thermodynamic parameters of complexes of Cu(II), Ni(n), and Zn(II) cations with 1,2-bis-(o-aminophenoxy)ethane and salicylaldehyde were determined in 60% (v/v) DMF-water, with various ionic strengths (0.07, 0.13, and 0.2 M NaNO3), and at different temperatures (25, 30, 35, and 40 ± 0.1°C) using a spectrophotometric method. Sodium nitrate solution was used to maintain the ionic strengths. The stability constants show an inverse relationship with ionic strengths. The thermodynamic parameters (60% (v/v) DMF-water) (?G°, ?H°, ?S°) based on these formation constants were determined. The values of enthalpy change are negative for all systems. The ligand behaves toward the metal ion as a tetradentate ligand. The acid dissociation constant of ligand was investigated in 60% (v/v) DMF-water and calculated at different temperatures. Copyright © 2005 by Aydin, Ziyadanoğullari, Temel.
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    Determination of stability constants and thermodynamic parameters of some metal complexes with 2-hydroxynaphthalin-1-carbaldehydene 1-naphtylamin
    (2005) Ziyadanoğullari B.; Aydin F.; Şahin E.; Aydin I.; Temel H.
    The thermodynamic parameters of complexes of Cu(II), Ni(II) and Zn(II) cations with hydroxynaphthalin-1-carbaldehydene-1-naphtylamin were determined in 60% (v/v) DMF-water, various ionic strengths (0.07,0.13, 0.2 M NaNO 3) and at different temperatures (25, 30, 35,40 ± 0.1°C) using a spectrophotometric method. The sodium nitrate solution was used to maintain the ionic strengths. The stability constants show an inverse relationship with ionic strengths. The thermodynamic parameters (60% (v/v) DMF-water 60% (v/v) DMF- water (?G0, ?H0, ?S0) based on these formation constants were determined. The acid dissociation constant of ligand was investigated in 60 % (v/v) DMF-water has also been calculated at different temperatures.
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    Geochemical methods to investigate the hydrocarbon seepage samples in Adiyaman a southeastern province of Turkey
    (University of Tehran, 2015) Önen K.; Yilmaz M.A.; Dicle Y.; Kavak O.; Temel H.
    The southeastern part of Turkey is quite rich, fertile and mature in terms of hydrocarbon seepages. While the use of the related sources meet the energy demand, it damages the environment and human health. In this study, several geochemical methods were applied to analyze the hydrocarbon sepage samples obtained from seven towns in the province of Adiyaman where is very close to the oil production areas and located in the Southeastern part of Turkey. First of all, Total Organic Carbon (TOC), Rock Evil Paralysis, Gas Chromatography (GC) and Gas Chromatography Mass Spectrometry analyses (GC – MS) were performed for the samples in question. In the light of these results, oil/bitumen mechanisms, source rock correlations, formation and migration mechanisms of the related geological environments were found. Then, Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES) analysis of Fe, Al, Mn, Mn, Zn, B, Pb, Ni, Cu metals were performed. Chemical and mineralogical features of the samples were investigated by IR and combined with ESR spectra. The samples display typical ESR spectra of Mn+2 ions hyperfine sextet whose last line was used to check the stones homogenity with respect to manganase content. In this study, heavy metal pollution and hydrocarbon compounds were determined to damage the environment and several suggestions were made to overcome the pollution and to enhance the productivity. © 2015, University of Tehran. All Rights Reserved.
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    New Co(II), Cu(II) and Ni(II) complexes with TOKMAK1,2-bis(o-aminophenoxy) ethane
    (2006) Tokmak N.; Şekercui M.; Temel H.
    1,2-Bis(o-aminophenoxy)ethane was prepared in a one stage process. In this reaction, Pd/C was used as catalyst 1,2-Bis(o-aminophenoxy)ethane was synthesized from 1,2-bis(o-nitrophenoxy)ethane. Diamine complexes [CoLCl 22H2O], [CuLCl2]0.5H2O and [NiL 2(C2H5O)2] have been synthesized and characterized by elemental analyses, ?M, IR, UV-VIS, 1H NMR and magnetic measurements.
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    A new preconcentration method for the determination of pb and ni in real samples by using amberlite xad-16 functionalized with 1,6-bis(2-carboxy aldehyde phenoxy)butane
    (Atomic Spectroscopy Press Limited, 2019) Oral E.V.; Erdogan S.; Temel H.; Ziyadanogullari B.; Ziyadanogullari R.
    In this study, a steady chelating resin matrix was formed by tying 1,6-bis(2-carboxy aldehyde phenoxy) butane to Amberlite XAD-16 resin by a-C=N-group. This synthesized adsorbent was placed into a minicolumn to separate and preconcentrate the lead and nickel ions before their determination by flame atomic absorption spectrometry (FAAS). The effects of many parameters on the preconcentration method were examined. The optimal pH value for the quantitative absorption of lead and nickel was pH 5.0. The percentage of recovery for lead and nickel was 99 ± 1.15% and 100 ± 2.70%, respectively. The detection limits of lead and nickel utilizing FAAS (3s, N= 20) were 1.47 and 1.16 µg/L, respectively. The effects of some matrix components on the recovery were analyzed. The suggested method was utilizied to determine lead and nickel in real water samples obtained from the River Tigris in Turkey, as well as in automobile exhaust particles, Romaine lettuce, and parsley. The accuracy of the proposed method was verified by using the standard addition method and the standard reference material NCS-DC 73350 Poplar Leaves. © Atomic Spectroscopy Press Limited. All rights reserved.
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    Sorption characteristics of transition metalions (Co, Ni) on sodium humate sorbents
    (International Journal of Chemical Sciences, 2014) Taubayeva A.S.; Dzhusipbekov U.Z.; Nurgalieva G.O.; Temel H.; Pasa S.
    The main objective of this work was to study the possibility of using sodium humate as a sorbent for water purification of water from heavy metal ions (Co & Ni). Studied was complexing and sorption properties of sodium humate. Metal-humate complexes were also obtained by ion-exchange procedure with sodium humate by employing the metal salts such Co(CH3COO)2·4H2O, NiSO4·6H2O. Maximum sorption percentages of humate achieved for 5 ppm 91.5%, 50 ppm 90.4%, 500 ppm 68.6% for Co(II) and 90% of 5 ppm, for 50 ppm 93.25%, 500 ppm 87.43% for Ni (II). Humate and metal ion interaction was investigated with special emphasis on the effects of pH, metal ions concentration and humate concentration. It has been found that the interaction of humate with metal ions in solution decreases with increases metal ion concentration and also increases with increases humate concentration. The pH experiment was investigated in the range for cobalt sorption was performed at a constant pH of 4, pH of the nickel ratio of 5, metal concentration was selected (5 mg/L, 50 mg/L, 500 mg/L), the sorbent was determined with the amount of 0.05 g, 0.1 g, 0.25 g, 0.5 g, 1 g, and 2 g. It is stated that sorption degree increases from 15 minutes to 2 hrs. The adsorption of toxic metal ions with sodium humate was measured by atomic absorption spectroscopy (AAS). All the obtained complex compounds were analyzed and characterized by FT infrared spectroscopy (FTIR), scanning electron microscopy (SEM).
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    Sorption removal of Pb2+, Cd2+, Cu2+ from diluted acid solution by chitosan modified zeolite
    (University of Chemical Technology and Metallurgy, 2018) Kussainova M.Z.; Chernyakova R.M.; Jussipbekov U.Z.; Temel H.; Pasa S.; Kaiybayeva R.A.; Agatayeva A.A.
    The results of investigations on sorption activity of chitosan modified natural zeolite in regard to the simultaneous presence of Pb2+, Cd2+ and Cu2+ are presented. The influence of the process duration and the cations concentration on the degree of their adsorption in diluted (20 % H3PO4) phosphoric acid is determined. The sorption curves show peaks at the 5-th and the 10-th minute most probably because of desorption from the sorbent. Under identical concentrations of all heavy metal cations studied (CPb 2+ = CCd 2+ = CCu 2+), the sorption degree in respect to lead cations is within the range of 78.02 % - 90.65 %, that in respect to cadmium cations varies from 71.22 % to 92.39 %, while that in respect to copper - from 42.00 % to 95.26 %. The character of the sorption curves recorded at identical concentrations of Pb2+ and Cd2+ but at a greater content of Cu2+ is the same. The degree of cadmium cations sorption varies from 92.39 % to 70.22 %. Cu and Pb cations are sorbed in a less amount. The degree of their sorption within 10 min refers to 88.42 % and 90.65 %, respectively, in case Cpb2+ = CCd2+ < CCu 2+.
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    Studies on the antiviral and cytotoxic activity of schiff bases derived from 1,2-bis-(o-and p-aminophenoxy)ethane and salicylaldehyde
    (Chemical Publishing Co., 2005) Bulut H.; Karatepe M.; Temel H.; Sekerci M.; Koparir M.
    A new synthesized derivative of substituted salicylaldehyde Schiff bases of aminophenoxy ethane were selected as new biological agents in the present study. The results indicate that none of the tested compounds was found to be an antiviral agent for DNA (bovine herpesvirus 1; BHV-1) and RNA (parainfluenza-3 viruses; PI-3) viruses used in this study but they possess highly cytotoxic effects.
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    Synthesis and characterization of zn(ii), cu(ii) and ni(ii) complexes with bidentate schiff base ligands. complexation studies and the determination of stability constant (ke)
    (2001) Temel H.; Çakir Ü.; Uğraş H.
    Nickel(II) and cupper(II) complexes of HL are synthesized, HL - the Schiff base derived from 1-naphtylamin and 2-hydroxynaphthalin-l-carbaldehyde. Cupper(II) and zinc(II) complexes of L? are synthesized, L? - the Schiff base derived from 1,4-diaminobuthane and 4-methoxy benzaldehyde. The complexes have been characterized by elemental analysis, magnetic measurements, conductance measurements, 1H NMR, UV, visible and IR-spectra. Analytical data and conductance spectral and magnetic studies provide evidence for the existence of the mononuclear compounds corresponding to a stoichiometry of MII : L (1 : 2) type. Furthermore, the conductometric determination of complexation constant, Ke, of AgNO3, ZnCl2 and Cu(NO3)2 in 80% dioxan-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 characterization of Zn(II), Cu(II) and Ni(II) complexes with bidentate Schiff base ligands: Complexation studies and the determination of stability constant (Ke)
    (IAPC Nauka/Interperiodica, 2001) Temel H.; Çakir Ü.; Uğraş H.I.
    The nickel(II), copper(II), and zinc(II) complexes with Schiff bases derived from 1-naphthylamine and 2-hydroxynaphthaline-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, 1H 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 MII: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, spectroscopic and electrochemical studies of novel transition metal complexes with N,N'-bis(2-hydroxynaphthalin-1-carbaldehydene)-1,3-bis-(o- aminophenoxy)propane
    (2007) Temel H.; Ilhan S.; Aslanoglu M.; Alp H.
    A novel Schiff base obtained by the reaction of 1,3-bis-(o-aminophenoxy) propane and 2-hydroxynaphthalin-1-carbaldehyde, forms complexes with Co(II), Cu(II) and Ni(II). The Schiff base ligand and its metal complexes have been characterized by elemental analysis, microanalytical data, magnetic measurements, UV-visible, 1H NMR, 13C NMR and IR-spectra as well as conductance measurements. Electrochemical data show that NiL and CuL complexes undergo metal based quasi-reversible one-electron redox processes. However, metal complexes also exhibit ligand based irreversible redox waves. The electrochemical results also indicate that the electron transfer rate is higher for NiL complex than the CuL complex. Voltammetric data reveal easier electron donor properties for the NiL complex.