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    Mn(II) and Co(II) mixed-ligand coordination compounds with acesulfame and 3-aminopyridine: synthesis and structural properties
    (Taylor & Francis Ltd, 2021) Yurdakul, Omer; Kose, Dursun Ali; Sahin, Onur; Ozer, Demet
    Two mixed ligand complexes containing acesulfame (acs) and 3-aminopyridine (3-ap) ligands of Mn(II) and Co(II) were synthesized. The obtained compounds were characterized by various analysis methods. The geometries of complexes, C18H28MnN6O12S2 (1) and C18H32CoN6O14S2 (2), are distorted octahedra. Coordination of metal cations is provided by two molecules of 3-ap and four water ligands. In both structures, the 2+ charge of the metal required two monoanionic acs molecules located outside the coordination sphere. Complex 1 contains no hydrate water, while 2 contains two molecules of hydrate water. The crystal system of 1 is monoclinic and space group P2(1)/c, while the crystal system of 2 is triclinic and space group P-1. Data on the removal of hydrate and crystalline waters in structures from thermal analysis curves support the described molecular structures. The bending vibrations of the bonds obtained from the FT-IR spectra match the crystal structure described. As a result of thermal analysis of both complexes, it was determined that the relevant metal cations remained in the reaction vessel as oxide (MnO and CoO) residues.
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    New mixed ligand complexes of alkaline earth metal cations containing nicotinamide and diphenic acid. Synthesis and structural properties
    (Elsevier, 2022) Yurdakul, Omer; Kose, Dursun Ali; Sahin, Zarife Sibel; Sahin, Onur
    Mixed-ligand coordination compounds containing neutral nicotinamide and monoanionic diphenate or-ganic molecules of alkaline earth metal cations, Mg2 + (C40H38MgN4O14) ( I ), Ca2 + (C40H34CaN4O2) ( II ), Sr2 +(C40H34N4O2Sr) ( III ) and Ba2 +(C40H34BaN4O2) ( IV ) were synthesised. Chemical composition analysis, single crystal XRD, spectroscopic, and thermal analysis methods were used to determine the structural properties of the compounds obtained. According to the data obtained from a single-crystal XRD analysis of the Mg2 + complex, the coordination environment of the metal cation was surrounded by four aqua and two nicotinamide ligands to form a distorted octahedral geometry. The charge balance of the com-plex sphere was provided by two diphenate ligands placed mono-anionically outside the coordination sphere. The structure is a salt-type complex. Since crystals suitable for single crystal structure analysis of other metal cations complexes ( II, III and IV ) could not be formed, the structural properties were tried to be explained by chemical composition analysis, spectroscopic, and thermal analysis methods. Accord-ingly, it is found that the coordination circles of metal cations are octahedral and all ligands (two aqua, two neutral nicotinamide, and two monoanionic-double-toothed diphenate) coordinate with the metal in the coordination sphere. The geometries of the complexes are detected to be of distorted cubic structure. (c) 2022 Published by Elsevier B.V.
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    Novel mixed ligand complexes of Co(II), Ni(II), Cu(II), and Zn(II) with 1,10-phenanthroline and acesulfame. Synthesis, structural analysis and hydrogen adsorption study
    (Pergamon-Elsevier Science Ltd, 2021) Sahin, Zarife Sibel; Demir, Mehmet; Yildirim, Tugrul; Yurdakul, Omer; Ali Kose, Dursun
    Four novel metal organic framework (MOF) structures containing acesulfame (ace) and 1,10-phenanthroline (phen) ligands of Co2+, Ni2+, Cu2+ and Zn2+ metal cations were synthesized. The crystal structure analysis of three compounds (1, 2, and 3) was also performed. The structural formula for complex 4 is proposed based on spectroscopic and thermal analysis data. It has been determined that structures 1, 2, and 4 are in a distorted octahedral geometry. It has been suggested that the charge balance of the coordination sphere with 2+ is provided by two monoanionic ace ligands located outside the coordination sphere as counter-ion. In structure 3, there are two Cu-II metal cations, two phen ligands coordinated as bidentate to each metal cation and ace ligand that provides monoanionic-monodentate coordination. The Cu2+ cation has distorted bipyramidal geometry. The maximum hydrogen gas adsorption has been found 1.4575 mL/g (0.046 wt%) for the Ni complex. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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    Novel monoanionic diphenate-nicotinamide/N,N-diethylnicotinamide complexes of NiII, ZnII. Synthesis, structural investigations and hydrogen adsorption study
    (Elsevier, 2020) Yurdakul, Omer; Sahin, Zarife Sibel; Kose, Dursun Ali; Sahin, Onur; Akkurt, Fatih
    [No abstract available]
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    The new metal complex templated polyoxoborate(s) (POB(s)) structures. Synthesis, structural characterization, and hydrogen storage capacities
    (Elsevier, 2017) Kose, Dursun Ali; Yurdakul, Omer; Sahin, Onur; Ozturk, Zeynel
    The polyoxoborate(s) (POB(s)) structures, including a neutral ligand-metal complex compound as a template, were synthesized and the structural characterizations were performed via single crystal X-ray diffraction, FIR, B-11-NMR, solid state UV-Vis spectroscopy, SEM and elemental analysis methods. Moreover, the stabilization features were determined via TGA/DTA method. In addition, nitrogen and hydrogen adsorption measurements provided the realization to determine the pore size distribution, BET surface area, and hydrogen storage capacities. The molecular formulas of compounds were estimated as [Cu(C12H8N2)(2)(C2H3O2)[B5O6(OH)(4)]center dot 2H(3)BO(3)center dot H2O (I) and [Ni(C12H8N2)(2)(H2O)(2)]center dot(B7O9(OH)(5))center dot 5H(2)O (II) and the existence of two different POB(s) structures as pentaborate (B5O6(OH)(4)) and heptaborate (B7O9(OH)(5)) within the compounds were observed. At last, it was found that the both structures have micro and mesoporosity with 0.407 and 1.480 m(2)/g BET surface areas, for the compound I and II, respectively. Moreover, within the same conditions, compound II could uptake 0.19 wt% hydrogen at 77 K and at the relative pressure of 1 while compound II uptakes 0.035 wt% hydrogen. (C) 2017 Elsevier B.V. All rights reserved.
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    Two novel mixed-ligand zinc-acesulfame compounds: Synthesis, spectroscopic and thermal characterization and biological applications
    (Elsevier, 2020) Yurdakul, Omer; Kose, Dursun Ali; Sahin, Onur; Avci, Gulcin Alp
    Two new tetrahedral acesulfame complexes, acesulfamato(N)acesulfamato(O)bis(3-aminopyridine) zinc(II) (C18H2ON6O8S2Zn, Zn-ace-3ap) and bis(acesulfamato-O)bis(benzotriazole)zinc(II) (C20H18N8O8S2Zn, Zn-ace-bta), were synthesized and characterized by single crystal X-ray diffraction, FT-IR spectroscopy, elemental analysis and thermal analysis techniques(TGA, DTA, DTG). The first compound, Zn-ace-3ap, crystallizes in triclinic space group P1 with parameters a = 7.978 (7) angstrom, b = 9.907 (6) angstrom, c = 15.778 (14) angstrom, alpha = 78.24 degrees (2), beta = 81.22 degrees (4), gamma = 75.99 degrees (2), Z = 2 and The second compound, Zn-ace-bta, crystallizes in monoclinic space group C2/c with parameters a = 19.879 (3) angstrom, b = 9.3637 (13) angstrom, c = 14.0852 (18) angstrom, beta = 105.483 degrees (4), Z = 4. The biological activities of the synthesized complexes were appraised through disk diffusion method as antibacterial, antimicrobial and antifungal in DMSO. Enterococcus faecalis (ATCC-29212), Staphylococcus aureus (ATCC-25923) as gram-positive bacteria, Pseudomonas aeroginosa (ATCC-27853) and Escherichia coli (ATCC-25922) as gram-negative bacteria, and Candida albicans (ATCC-10231) as fungus were grown with a view to investigate the antimicrobial effects of the complexes. (C) 2019 Elsevier B.V. All rights reserved.