Yazar "Şahin, Onur" seçeneğine göre listele

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    Crystal structure, 1 H and 13C NMR spectral studies of 1,2,4,5-oxadiazaborole derivatives
    (2019) Pir, Meryem; Ağırbaş, Hikmet; Şahin, Onur
    Substituent effects on 1H and 13C NMR chemical shifts of 5-substituted phenyl3-phenyl-4,5-dihydro-1,2,4,5-oxadiazaboroles (1a-r) were studied respectively.Single and duel substituent parameters were used for the correlation analysis ofsubstituent-induced chemical shifts with σ, F and R constants. The calculationshave shown the polar and resonance substituent effects on N-H proton and C=Ncarbon atoms. The ρ value was found positive for compounds (1a-r), which meansthat the substituent effect is normal. Additionally, crystal structure of compound(1i) was also studied. Density functional theory (DFT) calculations were carriedout to calculate the theoretical chemical shifts, bond distances and bond angles.
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    Crystal structure, 1H and13 C NMR spectral studies of 1,2,4,5-oxadiazaborole derivatives
    (Turkish Energy Nuclear and Mining Research Institute, 2019) Pir, Meryem; Ağırbaş, Hikmet; Şahin, Onur
    Substituent effects on 1H and 13C NMR chemical shifts of 5-substituted phenyl-3-phenyl-4,5-dihydro-1,2,4,5-oxadiazaboroles (1a-r) were studied respectively. Single and duel substituent parameters were used for the correlation analysis of substituent-induced chemical shifts with σ, F and R constants. The calculations have shown the polar and resonance substituent effects on N-H proton and C=N carbon atoms. The ρ value was found positive for compounds (1a-r), which means that the substituent effect is normal. Additionally, crystal structure of compound (1i) was also studied. Density functional theory (DFT) calculations were carried out to calculate the theoretical chemical shifts, bond distances and bond angles. © 2019, Turkish Energy Nuclear and Mining Research Institute. All rights reserved.
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    Hydro/ Solvothermal Synthesis and Crystal Structure of New Ni(II) Coordination Polymer Containing Pamoic Acid and Ethylenediamine Mixed Ligands : {[Ni(µ-pam)(en)2]·H2O}n
    (2017) Tümer, Yasemin; Şahin, Onur
    The new coordination polymers arranged from flexible pamoic acid, namely {[Ni(µ-pam)(en)2]·H2O}n (1), (H2pam= pamoic acid, en= ethylenediamine), have been synthesized under hydro/ solvothermal conditions and characterized by elemental analysis, simultaneous TG, DTA techniques, IR spectroscopy, and X-ray crystallography. X-ray single crystal structure analysis of 1 shows that the Ni(II) ions are bridged by pamoic acid ligands to generate 1-dimensional (1D) coordination polymer running parallel to the direction, with the Ni∙∙∙Ni separation is 14.057 Å. Adjacent 1D chains are connected by N-H···O and O-H···O hydrogen bonds to establishing 3 dimensional (3D) supramolecular network
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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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    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.
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    Synthesis and characterization of transition metal complex cationed heptaborate structures
    (Turkish Energy Nuclear and Mining Research Institute, 2023) Genç, Ahmet; Köse, Dursun Ali; Şahin, Onur
    In recent years, interest in the study of cyclic borate structures (hexaborate, heptaborate, etc.), which draws attention due to their piezoelectric properties, has increased. In the scope of our study, heptaborate rings using the transition metal cation coordination compound as cation were synthesized and tried to be structurally characterized by elemental analysis, melting point determination, FT-IR, TGA/DTA analysis, UV analysis, powder x-ray diffraction (P-XRD) analysis methods. The presence of the cationic coordination sphere in the structures was determined by the stretching vibrations of (-M-N)phen and (-M-N)pyrd observed in the infrared spectra.-OH peaks of characteristic B-OH bonds of heptaborate rings and sharp asymmetric and symmetric stretching vibrations were detected confirming the presence of trigonal borate molecule in the rings. Due to the similar thermal decomposition properties of the molecules, it was determined that the hydrated waters that precipitated out of the coordination sphere in all structures moved away from the structures in a single step. As the second degradation step of heptaborate salt structures, the presence of water in amounts attributable to the removal of-OH groups in borate rings as water vapor in all structures was calculated. It has been observed that this degradation step occurs in a single step in all structures and the relevant experimental theoretical mass losses are compatible with each other. Combustion degradation of organic ligands was observed as the final degradation step of the heptaborate salt structures with metal cation complexes. While peaks belonging to heptaborate rings were observed from the recorded powder x-ray diffraction patterns, electronic transition data also supported that the metal cation complex was in octahedral geometry. © 2023, Turkish Energy Nuclear and Mining Research Institute. All rights reserved.
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    The synthesis of new phosphazene-bearing ethyl p-hydroxybenzoate and ferrocenyl pendant groups and their spectroscopic and crystallographic characterizations
    (Turkish Chemical Society, 2020) Tümer, Yasemin; Çayırbaşı, Mahmut; Şahin, Onur; Hökelek, Tuncer
    This is a study of new hexachlorocyclotriphosphazene (N3P3Cl6) derivatives bearing ethyl p-hydroxybenzoate and ferrocenyl pendant groups. Characterizations of the products [mono-2, di-(geminal 3a; non-geminal transa-3b, transb-3c and cis-3d), tri-4 and tetra-5 substituted phosphazene derivatives] were performed using elemental analysis and spectral methods. The structures of the two compounds (2 and 5) were explained by the use of X-ray diffraction techniques. © 2020, Turkish Chemical Society. All rights reserved.
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    The Synthesis of New Phosphazene-Bearing Ethyl pHydroxybenzoate and Ferrocenyl Pendant Groups and their Spectroscopic and Crystallographic Characterizations
    (2020) Tümer, Yasemin; Çayırbaşı, Mahmut; Şahin, Onur; Hokelek, Tuncer
    This is a study of new hexachlorocyclotriphosphazene (N3P3Cl6) derivatives bearing ethylp-hydroxybenzoate and ferrocenyl pendant groups. Characterizations of the products [mono- 2, di-(geminal 3a; non-geminal transa-3b, transb-3c and cis-3d), tri- 4 and tetra- 5 substitutedphosphazene derivatives] were performed using elemental analysis and spectral methods. Thestructures of the two compounds (2 and 5) were explained by the use of X-ray diffractiontechniques.