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    Novel copper(II) and palladium(II) complexes with 4-aroyl-5-pyrazolone ligands: Synthesis and characterization
    (ELSEVIER SCIENCE SA, 2019) Bagdatli, Emine.; Yildirim, Fatih.; Ulucay, Gorkem.; Sayin, Ulku.
    Novel bidentate 4-aroyl-5-pyrazolone ligands were synthesized and reacted with copper(II) and palladium(II) salts in 1: 2 (metal: ligand) equimolar ratio leading to the formation of eight new coordination compounds. All synthesized compounds were characterized by FTIR, UVeVis, ESI-Mass, H-1 NMR, C-13-APT and also, in the case of the paramagnetic palladium(II) complexes, by ESR spectral studies. Additionally, elemental and thermogravimetric analyses (TG/DTG) were applied to all prepared complexes. These complexes are mononuclear and the copper(II) complexes have distorted square-planar geometry as determined by ESR. Spectral studies confirm the coordination of 4-aroyl-5-pyrazolone ligands through the carbonyl moieties to the metal. All the copper(II) complexes coordinated to the metal by enolization and the palladium(II) complexes showed 'Type B' coordination. The ligand which has 1-(4-methoxy) phenyl-substituted pyrazolone ring gave copper(II) complexes with a water molecule outside the coordination sphere. The proposed structures of the complexes agree well with the thermogravimetric decomposition results. (c) 2019 Elsevier B.V. All rights reserved.
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    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.