Yazar "Akkurt, Fatih" seçeneğine göre listele

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    Effect of carbon nanoparticles on the I V characteristics of dye doped nematic liquid crystal
    (Czech Society of Chemical Engineering, 2014) Akkurt, Fatih; Kaya, Nihan; Alıcılar, Ahmet
    [No abstract available]
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    Novel coordination compounds: Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) cations with acesulfame/N,N-diethylnicotinamide ligands
    (Taylor and Francis Ltd., 2020) Yıldırım, Tuğrul; Köse, Dursun Ali; Alp Avcı, Gülçin; Şahin, Onur; Akkurt, Fatih
    Five coordination complexes with Mn2? (1), Co2? (2), Ni2? (3), Cu2? (4), and Zn2? (5) containing acesulfame (ace) and N,N-diethylnicotinamide (dena) ligands were synthesized and structural binding properties investigated. Four compounds (1, 2, 4, and 5) were examined with single crystal X-ray diffraction methods. The structures containing Mn(II), Co(II), and Zn(II) were iso-structural. Six-coordination of metal cations were completed with two moles dena and four aqua ligands. The dena ligands were coordinated via pyridine nitrogen as neutral-monodentate. Charge stabilities of the complexes are complemented by two moles monoanionic ace ligands, located outside of the coordination unit. In the Cu(II) complex, the coordination is completed by acidic nitrogen and carbonyl oxygen atoms of two ace ligands and pyridine nitrogen of two moles dena ligands. The coordination to Cu(II) for ace ligands was monoanionic-bidentate. All metal cations in the structure are distorted octahedral. Thermal decomposition of complexes begins with removal of the aqua molecules from the structures and is completed by combustion of organic ligands. The final decomposition products of all structures have been identified as corresponding metal oxides. Some biological applications (anti-fungal/anti-bacterial) were studied using 1–5.
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    Novel monoanionic diphenate-nicotinamide/N,N-diethylnicotinamide complexes of Ni-II, Zn-II. Synthesis, structural investigations and hydrogen adsorption study
    (Elsevier, 2020) Yurdakul, Ömer; Şahin, Zarife Sibel; Köse, Dursun Ali; Şahin, Onur; Akkurt, Fatih
    The coordination compounds and polymers in which the transition metals are taken centrally are of interest due to their very different properties. The studies on the synthesis and structural properties of these compounds due to their potential applications for nanotechnology, sensor applications, magnets, optoelectronics, energy conversation and storage, gas storage, separation, catalysis and similar industrial applications are of great interest
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    Novel Non-Metal Cation (NMC) Pentaborate Salts of Some Amino Acids
    (Mdpi, 2019) Sızır, Ümit; Yurdakul, Ömer; Köse, Dursun Ali; Akkurt, Fatih
    Non-metal cation (NMC) pentaborate structures, in which some amino acids (valine, leucine, isoleucine, and threonine) were used as cations, were synthesized. The structural characterization of molecules was carried out by elemental analysis, FT-IR, mass, B-11-NMR, and thermal analysis (TGA/DTA) methods. The hydrogen storage capacity of molecules was also calculated by taking experimental results into consideration. The FT-IR spectra support the similarity of structures. The characteristic peaks attributable to pentaborate rings and amino acids were observed. When thermal analysis data were examined, it was observed that pentaborate salts gave similar degradation steps and degradation products. As a final degradation product of all thermal analysis experiments, a glassy form of B2O3 was observed. The valine pentaborate is the most thermally stable. Also, the amounts of hydrate water outside the coordination sphere of the compounds were determined by thermal analysis curves. The peaks of boric acid, triborate, and pentaborate structures were obtained in ppm with the B-11-NMR results of synthesized pentaborate compounds. With powder X-ray spectroscopy, all structures were found to be crystalline but not suitable for single-crystal X-ray analysis. The molecular cavities of the compounds detected by BET were found to be 3.286, 1.873, 2.309, and 1.860 g/cm(3), respectively. A low number of molecular cavities can be interpreted in several existing hydrogen bonds in structures. The hydrogen storage capacities of the molecules were found to be in the range of 0.04 to 0.07% by mass.
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    Phase transitions and molecular orientation in nematic liquid crystals doped with blue-red dye mixtures and carbon nanotubes
    (2013) Alıcılar, Ahmet; Kaya, Nihan; Akkurt, Fatih
    Phase transitions and molecular orientation in nematic liquid crystals (E7, E8, E63 and ZLI-1132) doped with blue dye (disperse blue 1, 3, 14 or 134) and blue 14 + red dye (disperse red 1, 60 or methyl red) mixtures were studied. At the second stage, effects of single-walled carbon nanotubes (SWCNTs) added to them were determined. When blue-red dye mixtures were doped into the liquid crystals, an increase in order parameter was observed compared to those of single dyes and a value of 0.70 was attained. The addition of carbon nanotubes resulted in very higher values of order parameter (Smax = 0.79). To determine the threshold value of order parameter for saturation, the experiments were repeated in various DC voltages. The threshold voltage was significantly reduced with addition of CNTs. With addition of dopants, an appreciable change in textures was not observed. Shifts in phase transition temperatures were in limitations required. Copyright © Taylor & Francis Group, LLC.
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    Synthesis and structural characterization of a binuclear mixed-ligand (Salicylate and N,N-diethylnicotinamide) nickel(II) complex, its magnetic properties. [Ni2(µ?Sal)4(Dena)2]H2O
    (Chinese Chemical Society Taiwan, 2014) Köse, Dursun Ali; Akkurt, Fatih; Şahin, Onur; Büyükgüngör, Orhan
    The title complex of [Ni2(?-Sal)4(Dena)2]H2O, [(?-tetrakissalicylato-?-O,O)(bis-N,N-diethylnicotinamide-?-N)(binickel(II))]hydrate, C48H52Ni2N4O16, has been synthesized and explained as structure using some elemental analyses. FT-IR spectra, UV-Vis reflectance, magnetic measurements, thermal analysis and x-ray diffraction methods. The results showed that the unit cell of complex includes two molecules NiII cation, four molecules salicylates as bridge and two molecules N,N-diethylnicotinamide ligands, also there is one molecule hydrated aqua. The compound crystallizes in the monoclinic space group P21/c with the following unit-cell parameters: a = 13.6776(6) A?, b = 10.5238(3) A?, c = 21.8165(9), ? = 90.00°, ? = 126.546(3)°, ? = 90.00° and Z = 2. The compound [Ni2(?-Sal)4(Dena)2]H2O is a typical paddle-wheel complex structure. Two NiII ions are bridged by four salicylate ligands (O2, O2i, O3, O3i, O5, O5i, O6 and O6i) using a ?-COO- coordination mode [symmetry code: (i) 1-x, 1-y, 1-z]. Each NiII also coordinates to one nitrogen atom (N1 and N1i) from one N,N-diethylnicotinamide ligand molecule in the axial position. The complex has strong paramagnetic properties. © 2014 The Chemical Society & Wiley-VCH Verlag GmbH & Co. KGaA.