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    Hydrothermal synthesis and crystal structures of a novel Keggin-type polyoxometalate based on 1,10-phenanthroline
    (2021) Uçar, Asuman; Fındık, Mükerrem; Kocak, Nuriye; Çolak, Alper Tolga; Şahin, Onur
    Herein a novel inorganic-organic hybrid Keggin-type heteropolymolybdate [Ni2Na(C12H8N2)4(BMo12O40)(H2O)2] (1) has been synthesized under hydrothermal conditions in aqueous solution. The cyrstal structure was fully characterized by powder X-ray diffraction (XRD), elemental analysis, Fourier-tranform infrared spectrum (FT-IR), Thermogravimetric analysis (TGA) and Scanning Electron Microscopy (SEM) analysis. Single crystal X-ray structural analysis demonstrates that the complex consists of a Keggin anion [BMo12O40]5− polyanion, four 1,10-phenanthroline (C12H8N2) ligands, two Ni(II) ions, two Na(I) ions and two aqua ligands. The experimental powder X-ray diffraction (XRD) result of the crystal is consistent with the calculated data. The SEM image shows that the compound crystals have a cubic structure.
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    Öğe
    Self-assembly of a new building block of {BMo12O40} with excellent catalytic activity for methylene blue
    (Pergamon-Elsevier Science Ltd, 2019) Findik, Mukerrem; Ucar, Asuman; Colak, Alper Tolga; Sahin, Onur; Bingol, Haluk; Sayin, Ulku; Kocak, Nuriye
    A novel organic-inorganic hybrid of 2,2'-bipyridyl (2,2'-bipy) linked covalently with the first inorganic framework based on boron-containing Keggin-type heteropolymolybdate anion [BMo12O40](5-) has been hydrothermally synthesized in aqueous solution. The crystal structure was fully characterized by elemental analyses, single crystal X-ray diffraction, Fourier-transform infrared spectrum (FT-IR), powder X-ray diffraction (XRD), Ultraviolet-visible spectroscopy (UV-Vis) and electron paramagnetic resonance (EPR) analysis. The catalytic performance of the synthesized catalyst was studied in degradation of methylene blue (MB) at ambient temperature. The catalyst exhibited excellent degradation against MB with a rate constant of 0.506/m, which was much higher than those by other polyoxometalate catalysts. Moreover, it was found to be easily separated from the reaction solution and recycled up to five times without significant loss of degradation activity. (C) 2019 Elsevier Ltd. All rights reserved.
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    Öğe
    Synthesis and Characterization of a New Nickel(II) Compound Derived from [BW12O40]3- and 2,2'-Bipyridyl
    (2020) Fındık, Mükerrem; Uçar, Asuman; Kocak, Nuriye; Şahin, Onur; Çolak, Alper Tolga
    A Keggin-type polyoxometalate {Ni(2,2'-bipy)2(H2O)[BW12O40]}3- (NiBWO) has been hydrothermallysynthesized in the high temperature resistant glass bottle for the first time. The structure has beencharacterized.by elemental analyses, X-ray diffraction, Fourier Transform Infrared Spectroscopy,Thermogravimetric Analysis, Scanning Electron Microscope and X-ray single crystal diffraction analyses.The X-ray single crystal study shows that the asymmetric unit of NiBWO is composed of one [BW12O40]5-anion, one [Ni(2,2'-bipy)2(H2O)]2+ and one and a half of [Ni(2,2'-bipy)3]2+ cations.