Yazar "Temel, H." seçeneğine göre listele
Listeleniyor 1 - 12 / 12
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Calculation of current-voltage characteristics of a Cu (II) complex/n-Si/AuSb Schottky diode(Elsevier, 2010) Akkilic, K.; Ocak, Y. S.; Kilicoglu, T.; Ilhan, S.; Temel, H.In this Study, Cu (II) complex/n-Si structure has been fabricated by forming a thin organic Cu (11) complex film on n-Si wafer. It has been seen that the structure has clearly shown the rectifying behaviour and can be evaluated as a Schottky diode. The contact parameters of the diode such as the barrier height and the ideality factor have been calculated using several methods proposed by different authors from current-voltage (I-V) characteristics of the device. The calculated barrier height and ideality factor values from different methods have shown the consistency of the approaches. The obtained ideality factor which is greater than unity refers the deviation from ideal diode characteristics. This deviation can be attributed to the native interfacial layer in the organic/inorganic interface and the high series resistance of the diode. In addition, the energy distribution of the interface state density (N-ss) in the semiconductor band gap at Cu (II) complex/n-Si interface obtained from I-V characteristics range from 2.15 x 10(13) cm(-2) eV(-1) at (E-c - 0.66) eV to 5.56 x 10(12) cm(-2) eV(-1) at (E-c - 0.84) eV. (C) 2009 Elsevier B.V. All rights reserved.Öğe Characterization of an Au/n-Si photovoltaic structure with an organic thin film(Elsevier Sci Ltd, 2013) Ozaydin, C.; Akkilic, K.; Ilhan, S.; Ruzgar, S.; Gullu, O.; Temel, H.We demonstrate that a copper(II) organic complex can control the electrical characteristics of conventional Au/n-Si metal semiconductor (MS) contacts. We investigated the electronic and photovoltaic properties of a Cu(II) complex/n-Si heterojunction diode. The ideality factor n and barrier height Phi(b) of the diode were 2.22 and 0.736 eV, respectively. An ideality factor greater than unity indicates that the diode exhibits non-ideal current voltage behavior. This behavior results from the effect of series resistance and the presence of an interfacial layer. The series resistance and barrier height determined using Norde's method were 6.7 k Omega and 0.77 eV, respectively. The device showed photovoltaic behavior, with a maximum open-circuit voltage of 0.24 V and a short circuit current of 1.7 mu A under light of 8 mW/cm(2). (C) 2013 Elsevier Ltd. All rights reserved.Öğe Complexation studies of N,N?-ethylene-bis(salicylideneimine)-cation complexation behavior in dioxane-water mixtures by conductometric studies(Maik Nauka/Interperiodica/Springer, 2006) Temel, H.; Cakir, U.; Ugras, H. I.The tetradentate-ligand Schiff base derived from salicylaldehyde and 1,2-diaminoethane has been synthesized. The stability constants and thermodynamic values for the complexation between ZnCl2, Cu(NO3)(2), and AgNO3 salts and the ligand in 80% dioxane-water were determined by conductance measurements. The order of the formation constant for complexes of the ligand with Cu(II), Zn(II), and Ag(I) ions was found to be: Ag(I) < Cu(II) < Zn(II). The magnitudes of these ion association constants are related to the nature of the solvation of the cation and the complexed cation.Öğe Dynamic 1H NMR Studies of Schiff Base Derivatives(Springer, 2016) Koylu, M. Z.; Ekinci, A.; Boyukata, M.; Temel, H.The spin-lattice relaxation time T (1) and the spin-spin relaxation time T (2) of two Schiff base derivatives, N,N'-ethylenebis(salicylidene)-1,2-diaminoethane (H2L1) and N,N'-ethylenebis (salicylidene)-1,3-diaminopropane (H2L2), in DMSO-d(6) solvent were studied as a function of temperature in the range of 20-50A degrees C using a Bruker Avance 400.132 MHz H-1 NMR spectrometer. Based on the activation energy (E (a)) and correlation time (tau(c)), we believe that the Schiff base derivatives perform a molecular tumbling motion.Öğe Geochemical Methods to Investigate the Hydrocarbon Seepage Samples in Adiyaman a Southeastern Province of Turkey(Springer International Publishing Ag, 2015) Onen, 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 productivityÖğe New Co(II), Cu(II) and Ni(II) complexes with 1,2-bis(o-aminophenoxy)ethane(Chem Soc Pakistan, 2006) Tokmak, N.; Sekerci, 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(2)2H(2)O], [CuLCl2]0.5H(2)O and [NiL2(C2H5O)(2)] have been synthesized and characterized by elemental analyses, Lambda(M), IR, UV-VIS, H-1 NMR and magnetic measurements.Öğe Preparation and spectral characterization of new macrocyclic Ni(II) and Co(II) complexes derived from 1,4-bis(2-carboxyaldehydephenoxy)butane and various diamines(Taylor & Francis Ltd, 2008) Temel, H.; Ilhan, S.; Kilic, A.; Tas, E.Six new macrocyclic complexes were synthesized by the template effect from reaction of 1,4-bis(2-carboxyaldehydephenoxy)butane, Ni(NO3)(2)center dot 6H(2)O or Co(NO3)(2)center dot 6H(2)O and various diamines. The metal-to-ligand ratios of Ni(II) or Co(II) metal complexes were found to be 1 : 1. Coordination of the Schiff base to Ni(II) and Co(II) through the two nitrogen and two oxygen atom (ONNO) are expected to reduce the electron density in the azomethine link and hydroxyl group. The Ni(II) and Co(II) complexes are proposed to be tetrahedral and are 1 : 2 electrolytes as shown by their molar conductivities (Lambda(M)) in DMF (dimethyl formamide) at 10(-3) M. The structures are proposed from elemental analysis, FT-IR, UV-VIS, magnetic susceptibility measurements, molar conductivity measurements, and mass spectra.Öğe Removability Efficiency of Heavy Metals with Modified Humate from Aqueous Media(Inst Higher Education Acad Sci, 2014) Taubayeva, A. S.; Dzhusipbekov, U. Z.; Nurgalieva, G. O.; Shakirova, A. K.; Temel, H.; Pasa, S.The main aim of this work was to study the possibility of using amine-modified humate as a sorbent for the purification of water from heavy metal ions (Cu& Co). One of the effective methods of creating new sorbents of humic acids is chemical modification based on the high reactivity of the functional groups in the composition of humic acids. The possibility of modification of humic acid with bis(3-aminopropyl) amine was illustrated. Modification was carried out with the aim of increasing its sorption capacity. Metalhumate complexes were also obtained by an ion-exchange procedure with modified humate (Mod-Hum) by employing metal salts such as Cu(CH3COO)(2)center dot H2O, Co(CH3COO)(2)center dot 4H(2)O. Maximum sorption percentages of Mod-Hum achieved were about 99.2% for Cu (II) and 90% for Co (II). The sorption degree depending on pH changes was studied in the range of 2 to 8, the sorption ability of the sorbents was stated to increase with the increase in pH. The degree of sorption of copper (II) on Mod-Hum in the studied range of pH 5 was higher and of cobalt (II) for which the sorption is optimal at higher values (pH 7-8). It is stated that sorption degree increases with the increase in time from 15 min to 2 h. The adsorption of toxic metal ions with Mod-Hum was measured by atomic absorption spectroscopy (AAS). The experimental results on determination of the adsorption isotherm were evaluated with the Langmuir equation. It is shown that the sorbent develops a high sorption capacity in regard to ions of Cu (18.42 mg/g) and Co (16.25 mg/g). All the obtained complex compounds were analyzed and characterized by FT infrared spectroscopy (FTIR), scanning electron microscopy (SEM).Öğe Selective Extraction of Copper(II) from Aqueous Solution by Using Schiff Bases(Polish Chemical Soc, 2009) Aydin, I.; Sozcan, S.; Ziyadanogullari, B.; Temel, H.New [N,N'-bis-(salicylaldehydene)-1,2-bis-(m-aminophenoxy)ethane] (MAS) and a common tetra dentate ligand N,N'-ethylenebis(salicylideneimine) (AS) for this study have been prepared, and the new ligand was characterized on the basis of microanalytical data, elemental analysis, UV-visible, IR, H-1 NMR and C-13 NMR spectra. Selective extraction of Cu(II) from aqueous solution by using N,N'-bis-(salicylaldehydene)-1,2-bis-(m-aminophenoxy)ethane and N,N'-ethylenebis(salicylideneimine) was studied. Separation of Cu(II) from other metal ions such as Cd(II), Pb(II), Ni(II), Co(II) in aqueous solutions of various pH values and complexing reagents (MAS, AS) was described. The separation factors for these metals using these reagents were reported and efficient methods for the separation of Cu(II) from other metal ions were proposed. From the loaded organic phase, Cu(II) stripping was carried out in one stage with different mineral acid solutions. The stripping efficiency was found to be quantitative in case of H2SO4 for MAS and HNO3, H2SO4, HCl for AS.10Öğe Synthesis and spectral studies of new Co(II), Cu(II), and Ni(II) metal complexes with aromatic diamine(Maik Nauka/Interperiodica/Springer, 2008) Temel, H.; Demirbas, Ue.; Sekerci, M.1,2-bis(p-aminophenoxy)ethane was obtained with reduction of 1,2-bis(p-nitrophenoxy)ethane and Pd/C as catalyst in hydrazine hydrate. Co(II), Cu(II), and Ni(II) complexes of aromatic bidentate diamine were prepared. The structure of the ligand and its complexes were characterized by IR, elemental analysis, magnetic susceptibility, conductivimetry, UV-Vis and H-1 NMR spectroscopy. The metal/ligand mole ratios were found to be 1:1. The general compositions of these complexes are found to be [CoLCl2], [CuLCl2], and [CoLCl2].Öğe Synthesis, characterization, and spectroscopic studies of novel transition metal complexes with N,N'-bis(salicylaldehydene)-1,4-bis(4-chloro-2-aminophenoxy)butane(Maik Nauka/Interperiodica/Springer, 2007) Temel, H.; Ilhan, S.The metal complexes of Co(II), Cu(II), Ni(II), and Zn(II) with novel quadridentate Schiff base derived from 1,4-bis(4-chloro-2-aminophenoxy)butane and salicylaldehyde have been synthesized in DMF. These complexes have been characterized by microanalytical data, elemental analysis, magnetic measurements. C, H-1 NMR, C-13 NMR, UV-vis and IR-spectra as well as conductance measurements were used to confirm the structures. On the basis of these observations it is suggested that these complexes exhibit the coordination number four.Öğe Synthesis, Characterization, Catalytic Applications and Optical Sensing Properties of Palladium Complexes Containing Tetradentate Schiff Bases(Asian Journal Of Chemistry, 2014) Yaman, P. Ktse; Subasi, E.; Temel, H.; Oter, O.; Celik, E.In this study, the synthesis, spectroscopic and catalytic properties of PdLn (n = 1-6) complexes with tetradentate -ONNO- and -SNNS- type Schiff base ligands (LH2)-H-n (n = 1-6) were investigated. The PdLn (n = 1-6) complexes were synthesized by the thermal reactions of the Schiff bases and Pd(OAc)(2) in acetonitrile and characterized by elemental analysis, FT-IR, H-1 NMR, UV-visible and TGA/DTG. The spectroscopic studies suggest that all of the ligands are coordinated to the central metal as a tetradentate ligand coordinating via the central azomethine nitrogens (C=N) and phenolic oxygen/sulfur atoms. On the palladium-catalyzed Suzuki cross-coupling reactions employing PdLn (n = 1-6) complexes toward a various substituted arylbromides and boronic acids were pursued. The conversions were obtained and yields with different arylbromides were calculated and discussed. All the complexes were thermally stable and were not sensitive to air or the moisture. The complexes were easily prepared from low cost precursors that could be used as versatile and catalysts for different C-C coupling reactions (Suzuki-Miyaura reactions). Moreover steady state fluorescence emission and excitation spectra were measured. These studies have been shown that PdL2 and PdL3 dyes exhibited high fluorescence intensity and selective and efficient response to cobalt ions over other metal ions in buffered solutions.
