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    Öğe
    Heteronuclear coordination polymers with imidazole ligand: Synthesis, characterization and alcohol oxidation activities
    (Pergamon-Elsevier Science Ltd, 2024) Kurkcuoglu, Guenes Suheyla; Yesilel, Okan Zafer; Mwanza, Telvin; Kekec, Seray; Unver, Hakan; Sahin, Onur
    Two new heteronuclear Cd(II)/Pd(II) coordination polymers, [Cd2(mu -im)2(Him)4Pd(mu -CN)4]n (1) and [Cd (Him)2Pd(mu -CN)4]n (2) (Him: imidazole), have been synthesized under different conditions and characterized using elemental analysis, thermal analysis, FT-IR and Raman spectroscopy, single-crystal and powder X-ray diffraction techniques. In 1, the Cd(II) ions are bridged by imidazolate ligands to generate 1D chain structure. Neighbouring 1D chains were linked by [Pd(CN)4]2- ions to form 3D framework. In 2, the metal ions are bridged by cyanide ligands to generate 2D [Cd2Pd2(mu -CN)4]n network. Catalytic peroxidative oxidation activity of 1 and 2 was examined on the oxidation of benzyl alcohol using tertiary-butyl hydroperoxide (t-BuOOH) as the oxygen source. The compound 1 exhibited over 90 % product conversion at 80 degrees C in 24-hour reaction time. In addition, the catalyst exhibited high selectivity towards benzaldehyde and no over-oxidation product (benzoic acid) was detected.
  • [ X ]
    Öğe
    Synthesis, spectroscopic, structural characterizations, and catalytic properties of cyanide-bridged heteronuclear metal organic frameworks with imidazole
    (Academic Press Inc Elsevier Science, 2022) Mwanza, Telvin; Kurkcuoglu, Gunes Suheyla; Unver, Hakan; Sahin, Onur; Yesilel, Okan Zafer
    Three new cyanide-bridged metal complexes of the general formula [Cu-2(mu-im)(2)(im)(4)M(mu-CN)(4)] n (where M = Ni(II) for 1, Pd(II) for 2, and Pt(II) for 3; im: imidazole) have been synthesized. All 1-3 were investigated using different and properly chosen physicochemical methods: Fourier transform infrared (FT-IR) and Raman spectroscopies (R), thermal analysis (TG, DTG, DTA), powder and single-crystal X-ray diffraction (PXRD and SC-XRD). The polymeric structures of all complexes crystalize in the same triclinic P-1 space group. Brunauer-Emmett-Teller (BET) method was used for the surface area analysis. The average particle size and morphology were estimated by scanning and transmission electron microscope (SEM and TEM). The heterogeneous catalytic activity of complex 2 catalysts was evaluated on the Suzuki-Miyaura reaction between selected aryl halides and phenyboronic acid. Complex 2 exhibits moderate to high heterogeneous catalyst activity for the Suzuki C-C coupling reaction in an organic/water solvent environment.