Yazar "Unver, Hakan" seçeneğine göre listele

Listeleniyor 1 - 5 / 5
  • [ X ]
    Öğe
    Heteronuclear cadmium(II)/cobalt(III) cyanide coordination polymers with 1-methylimidazole and 1-ethylimidazole ligands: synthesis, characterization and activities
    (Elsevier Science Sa, 2025) Kurkcuoglu, Guenes Sueheyla; Kekec, Seray; Yesilel, Okan Zafer; Gokkus, Kutalmis; Unver, Hakan; Sahin, Onur
    Two new heteronuclear Cd(II)/Co(III) compounds, {[Cd(1-meim)3Cd0.5(1-meim)Co(mu-CN)4(CN)2]}n 3 Cd 0 . 5 (1-meim)Co(mu-CN) 4 (CN) 2 ]} n (1) 1 ) and {[Cd(1-etim)3Cd0.5(1-etim)2Co(mu-CN)3(CN)3]& sdot;H2O}n 3 Cd 0 . 5 (1-etim) 2 Co(mu-CN) 3 (CN) 3 ] & sdot; H 2 O} n (2) 2 ) (1-meim: 1-methylimidazole, 1-etim = 1-ethylimidazole), have been synthesized and characterized using elemental analysis, FT-IR and Raman spectroscopy, single-crystal X-ray diffraction techniques. The single crystal X-ray study shows that the compound 1 exhibited a 1D double chain structure and is further linked into 3D supramolecular architectures through C-H & sdot;& sdot;& sdot;N - H & sdot;& sdot;& sdot; N and it & sdot;& sdot;& sdot;it & sdot;& sdot;& sdot; it interactions. Whereas the compound 2 displayed 2D network which is extended into a 3D supramolecular framework by O-H & sdot;& sdot;& sdot;N - H & sdot;& sdot;& sdot; N hydrogen bonds and C-H center dot center dot center dot it - H center dot center dot center dot it interactions. In 1 and 2 , each Co(III) ion is coordinated by six carbon atoms from cyanide ligands, thus showing an octahedral coordination geometry. Cd1 and Cd2 ions exhibited two different geometries, distorted trigonal bipyramidal and octahedral. Furthermore, phase purities, catalytic and thermal properties were investigated.
  • [ X ]
    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
    Heteronuclear Hexacyanometallate(III) Coordination Polymers (Cd/Cr, Cd/Fe, Cd/Co) with 3-(Aminomethyl)pyridine: Synthesis, Characterization, and Catalytic Activities for the Peroxidative Oxidation of Benzylic Alcohols
    (Springer, 2024) Kekec, Seray; Kurkcuoglu, Gunes Suheyla; Unver, Hakan; Sahin, Onur; Yesilel, Okan Zafer
    Three new heteronuclear hexacyanometallate(III) coordination polymers (CPs), [Cd3(mu-3ampy)4(H2O)4Cr2(mu-CN)8(CN)4]n (1), [Cd3(mu-3ampy)2(H2O)2Fe2(mu-CN)5(CN)7]n (2) and [Cd3(mu-3ampy)4(H2O)4Co2(mu-CN)8(CN)4]n (3), were synthesized with 3-(aminomethyl)pyridine (3ampy) ligand. All CPs were characterized by FT-IR, Raman, elemental, thermal analysis as well as single crystal X-ray diffraction and powder X-ray diffraction techniques. The single crystal X-ray diffraction analyses shows that the CPs 1 and 3 are two-dimensional structures, whereas CP 2 is a three-dimensional structure where two adjacent metal ions ions are linked via 3ampy and CN bridges. The coordination spheres of all CPs show distorted octahedral geometries. CP 3 was mainly tested as heterogenous catalyst for peroxidative oxidation of benzyl alcohol and its derivatives (4-chloro, 4-bromo, 4-methyl, 4-metoxy and 4-nitro benzyl alcohol). From the results, the highest aldehyde formation was obtained from the oxidation of benzyl alcohol with overall yield as 100%. In addition, catalytic reactions exhibited high selectivity towards aldehyde and no over-oxidation product (carboxylic acid) was observed.
  • [ X ]
    Öğe
    Syntheses and characterizations of two-dimensional heteronuclear tetracyanonickelate(II) complexes with 4-ethylpyridine and investigation of the catalytic activity of [Cd(4epy)2Ni(μ-CN)4]n
    (Taylor & Francis Ltd, 2023) Kurkcuoglu, Gunes Suheyla; Yesilel, Okan Zafer; Kekec, Seray; Unver, Hakan; Sahin, Onur
    Three new 2D heteronuclear tetracyanonickelate(II) complexes with 4-ethylpyridine (4epy), [Cu(4epy)(2)Ni(mu -CN)(4)](n) (1), [Zn(4epy)(2)Ni(mu -CN)(4)](n) (2) and [Cd(4epy)(2)Ni(mu -CN)(4)](n) (3), were synthesized and characterized by vibrational (FT-IR and Raman) spectroscopy, elemental and thermal analyses, single crystal (SC-XRD) and powder X-ray diffraction (PXRD) techniques. The single crystal X-ray analysis reveals that each metal ion (Cu(II), Zn(II), and Cd(II)) is coordinated by two nitrogen atoms from 4epy ligands and four nitrogen atoms from cyanide ligands and Ni(II) ions are coordinated by four carbon atoms from cyanide ligands showing a distorted octahedral and square planar coordination geometries, respectively. The most outstanding features of the complexes are the weak intermolecular C-H & sdot;& sdot;& sdot;Ni interactions between the Ni(II) ion and hydrogen atom of the ethyl group of the 4epy ligand. Adjacent 2D structures are further combined by these C-H & sdot;& sdot;& sdot;Ni interactions, generating a 3D network. The heterogeneous catalytic activity of 3 was investigated for oxidation of some primary and secondary aliphatic or aromatic alcohols; no acid formation was observed in some aromatic alcohols after 24 h and 100% aldehyde selectivity was determined.
  • [ 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.