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    Fabrication and characterization of magnesium and calcium trimesate complexes via ion-exchange and one-pot self-assembly reaction
    (Elsevier Science Bv, 2018) Ozer, Demet; Oztas, Nursen Altuntas; Kose, Dursun A.; Sahin, Onur
    Using two different synthesis methods, two diversified magnesium and calcium complexes were successfully prepared. When the ion exchange method was used, C9H14MgO11 center dot H2O and G(18)H(30)Ca(3)O(24) complexes were obtained. When the one-pot self-assembly reaction was used, C18H34Mg3O26 center dot 4H(2)O and C9H12CaO10 complexes were produced. The structural characterizations were performed by using X-ray diffraction, FT-IR and elemental analyses. Thermal behavior of complexes were also determined via TGA method. The both complexes of magnesium and calcium trimesate have micro and mesoporosity with low porosity because of hydrogen bonds. Then hydrogen storage capacities of complexes were also determined. The differences in synthesis method result in the differences on complexes structure, morphology (shape, particle size and specific surface area) and hydrogen storage capacities. (C) 2017 Elsevier B.V. All rights reserved.
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    Mn(II) and Co(II) mixed-ligand coordination compounds with acesulfame and 3-aminopyridine: synthesis and structural properties
    (Taylor & Francis Ltd, 2021) Yurdakul, Omer; Kose, Dursun Ali; Sahin, Onur; Ozer, Demet
    Two mixed ligand complexes containing acesulfame (acs) and 3-aminopyridine (3-ap) ligands of Mn(II) and Co(II) were synthesized. The obtained compounds were characterized by various analysis methods. The geometries of complexes, C18H28MnN6O12S2 (1) and C18H32CoN6O14S2 (2), are distorted octahedra. Coordination of metal cations is provided by two molecules of 3-ap and four water ligands. In both structures, the 2+ charge of the metal required two monoanionic acs molecules located outside the coordination sphere. Complex 1 contains no hydrate water, while 2 contains two molecules of hydrate water. The crystal system of 1 is monoclinic and space group P2(1)/c, while the crystal system of 2 is triclinic and space group P-1. Data on the removal of hydrate and crystalline waters in structures from thermal analysis curves support the described molecular structures. The bending vibrations of the bonds obtained from the FT-IR spectra match the crystal structure described. As a result of thermal analysis of both complexes, it was determined that the relevant metal cations remained in the reaction vessel as oxide (MnO and CoO) residues.
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    Öğe
    Novel mixed ligand complexes of acesulfame / nicotinamide with some transition metals. Synthesis, crystal structural characterization, and biological properties
    (Elsevier Science Bv, 2019) Yildirim, Tugrul; Kose, Dursun Ali; Avci, Emre; Ozer, Demet; Sahin, Onur
    The salt type mixed ligand metal complexes of COII (I), Ni-II (II), Cu-II (III), Zn-II (IV) and Mn-II (V) were synthesized using neutral ligand nicotinamide and anionic ligand acesulfame. The structural characterizations of complexes were performed by using elemental analysis, magnetic susceptibility, solid-state UV-Vis, FUR spectra, thermoanalytic TG-DTG/DTA, and single crystal X-ray diffraction methods. The complexes of I, III, IV, and V were obtained suitable crystal form for single crystal analysis by SC-XRD diffraction. The complexes of II was believed that the others structures so, the spectroscopic results of all the complexes are suitable for each other. The complexes are salt type compounds, and they have 2 mol nicotinamide ligands as monodentate coordination to metal center by pyridine N atoms and 4 mol aqua ligands in coordination sphere and 2 mol anionic acesulfamate ligands located outside of coordination unit as a counter ion. The metal(II) cationic atoms in complexes have octahedral geometry. Thermal decomposition steps of compounds are started with dehydration. (C) 2018 Published by Elsevier B.V.
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    Study of structural, surface and hydrogen storage properties of boric acid mediated metal (sodium)-organic frameworks
    (Elsevier, 2018) Ozer, Demet; Kose, Dursun A.; Sahin, Onur; Oztas, Nursen A.
    Three boric acid mediated metal organic frameworks were synthesized by solution method with using succinic acid, fumaric acid and acetylene dicarboxylic acid as a ligand source and sodium as a metal source. The complexes were characterized by FT-IR, powder XRD, elemental analyses and single crystal measurements. The complexes with the formula, C4H18B2Na2O14, C4H16B2Na2O14 and C4H14B2Na2O14 were successfully obtained. BET surface area of complexes were calculated and found as 13.474 m(2)/g for catena-(tetrakis(mu 2-hydroxo)-(mu 2-trihydrogen borate)-(mu 2-succinato)-di-sodium boric acid solvate), 1.692 m(2)/g for catena-(tetralds(mu 2-hydroxo)-(mu 2-trihydrogen borate)-(mu 2-fumarato)-di-sodium boric acid solvate) and 5.600 m(2)/g for catena-(tetrakis(mu 2-hydroxo)-(mu 2-trihydrogen borate)-(mu 2-acetylenedicarboxylato)-di-sodium boric acid solvate). Hydrogen storage capacities of the complexes were also studied at 77 K 1 bar pressure and found as 0.108%, 0.033%, 0.021% by mass. When different ligands were used, the pore volume, pore width and surface area of the obtained complexes were changed. As a consequence, hydrogen storage capacities also changed. (C) 2017 Elsevier B.V. All rights reserved.
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    Öğe
    Synthesis and characterization of boric acid mediated metal-organic frameworks based on trimesic acid and terephthalic acid
    (Elsevier Science Bv, 2017) Ozer, Demet; Kose, Dursun A.; Sahin, Onur; Oztas, Nursen Altuntas
    The new metal-organic framework materials based on boric acid reported herein. Sodium and boron containing metal-organic frameworks were synthesized by one-pot self-assembly reaction in the presence of trimesic acid and terephthalic acid in water/ethanol solution. Boric acid is a relatively cheap boron source and boric acid mediated metal-organic framework prepared mild conditions compared to the other boron source based metal-organic framework. The synthesized compounds were characterized by FT-IR, p-XRD, TGA/DTA, elemental analysis, C-13-MAS NMR, B-11-NMR and single crystal measurements. The molecular formulas of compounds were estimated as C18H33B2Na5O28 and C8H24B2Na2O17 according to the structural analysis. The obtained complexes were thermally stable. Surface properties of inorganic polymer complexes were investigated by BET analyses and hydrogen storage properties of compound were also calculated. (C) 2017 Elsevier B.V. All rights reserved.