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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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    Öğe
    Novel potassium-boron metal-organic frameworks: Influence of ligand variation on structural and hydrogen storage properties
    (Elsevier, 2025) Ozer, Demet; Kose, Dursun Ali; Sahin, Onur; Oztas, Nursen Altuntas
    In this study, two novel potassium-based metal-organic frameworks (MOFs) mediated by boric acid were synthesized via a one-pot self-assembly reaction using terephthalic acid and acetylenedicarboxylic acid as ligands in ethyl acetate. The synthesized compounds were thoroughly characterized using Fourier-transform infrared spectroscopy (FT-IR), powder X-ray diffraction (p-XRD), thermogravimetric analysis (TGA), elemental analysis, and single-crystal X-ray diffraction (sc-XRD). Structural analysis revealed the molecular formulas of the new compounds as C16H18B2K4O16 and C2H3BKO5, respectively. Both compounds exhibited high thermal stability. The Brunauer-Emmett-Teller (BET) surface area measurements indicated values of 2.152 m2/g for the potassium terephthalate-boron complex and 4.468 m2/g for the potassium acetylenedicarboxylate-boron complex. Variations in the ligands influenced the surface area, pore volume, and pore size of the complexes, which, in turn, affected their hydrogen storage capabilities.
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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.