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Öğe Determination of stability constants and thermodynamic parameters of some metal complexes with 2-hydroxynaphthalene-1-carbaldehydene-1-naphthylamine(Maik Nauka/Interperiodica/Springer, 2005) Ziyadanogullari, B; Aydin, F; Sahin, E; Aydin, I; Temel, HThe thermodynamic parameters of complexes of Cu(II), Ni(II), and Zn(II) cations with hydroxynaphthalene-1-carbaldehydene-1-naphthylamine were determined in 60% (v/v) DMF-water, at various ionic strengths (0.07, 0.13, 0.2 M NaNO3), and at different temperatures (25, 30, 35, 40 +/- 0.1 degrees C) using a spectrophotometric method. A sodium nitrate solution was used to maintain the ionic strengths. The stability constants show an inverse relationship with the ionic strengths. The thermodynamic parameters (60% (v/v) DMF-water (Delta G(0), Delta H-0, Delta S-0)) based on these formation constants were determined. The acid dissociation constant of the ligand was investigated in 60% (v/v) DMF-water and was also calculated at different temperatures.Öğe Recovery of copper, cobalt, nickel, cadmium, zinc and bismuth from electrolytic copper solution(Scientific Technical Research Council Turkey, 1998) Aydin, F; Yavuz, O; Ziyadanogullari, B; Ziyadanogullari, RAn electrolytic Copper Solution (ECS) was electrolyzed using platinum electrodes. Copper was obtained in solid form. In order to precipitate Cd(II), Bi(III), As(III), Sb(III) and the rest of the Cu(II) ions, H2S gas was passed through the remaining solution. The remaining solution was evaporated to obtain metal sulphates. The sample containing metal sulphates was roasted at temperatures between 550 and 800 degrees C. Cobalt, nickel and zinc in the solid sample remained in the form of metal sulphates, while the iron in the sample was converted into Fe2O3. This solid sample was dissolved in water and filtered in order to crystallize the NiSO4. As a result of crystallization, a maximum yield of 86.2 % m as obtained. The solid containing metal sulphides (CuS, CdS, Bi2S3 and Sb2S3) was roasted at 600 degrees C for 3 hours. The roasted sample was dissolved in water and filtered. It was determined that the conversion of CuS into CuSO4 occurred, together with the conversion of CdS and Bi2S3 into CdO and Bi2O3. The samples containing CdO and Bi2O3 were then leached with 0.5 M H2SO4 solution at 50 degrees C for one hour. The extraction yield was 97%.Öğe Studies on Pleurotus ostreatus (Jacq, ex Fr.) Kum. var. salignus (Pers. ex Fr.) Konr. et Maubl.(Elsevier Sci Ltd, 1998) Yildiz, A; Karakaplan, M; Aydin, FThis study was conducted on the growth and cultivation of Pleurotus ostreatus var. salignus on local cellulosic wastes. The highest and lowest yields for 100 g material (70% moisture) were obtained with peanut straw (24.8 g) and with sorghum straw (11.3 g), respectively. Protein, pilus/stip, sporophore weight, % dry material, N and C in highest amounts were obtained with peanut straw. The lowest mushroom weight and pilus/stip ratio were obtained with sorghum, whereas the lowest protein, N and dry material weight were obtained with wheat straw. In all the P. ostreatus var. salignus cultivated on peanut and sorghum straw, the most abundant nutrients were protein, potassium and carbon. These results are discussed in relation to the prospect of cultivating P. ostreatus var. salignus in Diyarbakir, Turkey. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.Öğe Synthesis, spectral studies, and determination of stability constants and thermodynamic parameters for some aromatic diamine transition-metal complexes(Pleiades Publishing Inc, 2006) Temel, H; Ziyadanogullari, B; Alp, H; Aydin, I; Aydin, F; Ilhan, SThe Cu(II) and Zn(II) complexes of aromatic bidentate diamines were prepared and characterized by different analytical and spectral methods. Thermodynamic parameters of complexes of Cu(II) and Zn(II) cations with 1,3-bis(p-aminophenoxy)propane were determined in 60 vol. % DMF-H2O at various ionic strengths (0.07, 0.13, 0.2 M NaNO3) and different temperatures (45, 50, 55, 60 +/- 0.1 degrees C) using a spectrophotometric method. The NaNO3 solution was used to maintain the ionic strength. The stability constants show an inverse relationship with ionic strengths. The thermodynamic parameters of 60 vol. % DMF-H2O (Delta G degrees, Delta H degrees, Delta S degrees) based on these formation constants were determined.Öğe Synthesis, spectroscopic and thermodynamic studies of new transition metal complexes with N,N?-bis(2-hydroxynaphthalin-1-carbaldehydene)-1,2-bis(m-aminophenoxy)ethane and their determination by spectrophotometric methods(Taylor & Francis Ltd, 2005) Temel, H; Ziyadanogullari, B; Aydin, I; Aydin, FA novel tetradentate N2O2-type Schiff base, synthesized from 1,2-bis(m-aminophenoxy)ethane and 2-hydroxynaphthalin-1-carbaldehyde, forms stable complexes with transition metal ions such as Cu(II), VO(IV) and Zn(II) in DMF. Microanalytical data, elemental analysis, magnetic measurements, UV, visible and IR spectra as well as conductance measurements were used to confirm the structures. The stability constants of these complexes in 60% (v/v) DMF-water were determined at different ionic strengths (0.07, 0.13, 0.2 M) and at different temperatures (45,50,55,60 +/- 0.1 degrees C) using a spectrophotometric method. From these constants, thermodynamic stability constants and thermodynamic parameters (Delta G(0), Delta H degrees, Delta S degrees) were calculated. The values of enthalpy change are negative for all systems. The acid dissociation constant of the ligand, investigated in 60% (v/v) DMF-water, has also been calculated at different temperatures.
