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    Öğe
    Novel mixed-ligand complexes of coumarilate/N,N'-diethylnicotinamide with some transition metals Synthesis and structural characterization
    (Springer, 2017) Dagli, Ozge; Kose, Dursun Ali; Avci, Gulcin Alp; Sahin, Onur
    Coordination complexes of transition metal cations (Co-II, Ni-II, Cu-II and Zn-II) containing coumarilate and N,N'-diethylnicotinamide were synthesized. The structural characterization and thermal behaviour analysis of novel samples synthesized were conducted through elemental analysis, magnetic susceptibility, solid-state UV-Vis, direct and injection probe mass spectra, FTIR spectra, thermoanalytic TG-DTG/DTA and single crystal X-ray diffraction methods. The structural details of single crystals of [Co(dena)(2)(H2O)(4)](coum)(2) (I) and [Cu(coum)(2)(dena)(2)(H2O)(2)] (III) complexes were resolved completely. Moreover, the results of analysis obtained for [Ni(coum)(2)(dena)(2)(H2O)(2)] (II) and [Zn(dena)(2)(H2O)(4)](coum)(2) (IV) complexes were interpreted considering the samples with crystal structures defined and made assumptions about the structural details. It was determined that the complex of Co-II metal cation has salt-type structure and the coordination number of metal is accomplished to six as the sum of 4 mol of water and also 2 mol of N,N'-diethylnicotinamide ligands in trans position located within the coordination sphere. It was observed that 2 mol of coumarilate anions are located outside the coordination sphere and have stabilized to the charge (2+) of metal. The Cu-II complex has totally molecular structure, and the coordination sphere of metal cation was 6 as the sum of 2 mol of water, 2 mol of N,N'-diethylnicotinamide and 2 mol of monoanionic monodentate coumarilate ligands. All ligands have been located in -trans position. The geometry of both complex structures is distorted octahedral. It is assumed that the Ni-II complex structure is isostructural with Cu-II complex structure and also does Zn-II complex with Co-II structure. It was determined that the decomposition products obtained from thermal analysis are the oxides of related metal cations.
  • [ X ]
    Öğe
    The mixed ligand complexes of Co(II), Ni(II), Cu(II) and Zn(II) with coumarilic acid/1,10-phenanthroline Synthesis, crystal characterization and biological applications
    (Springer, 2019) Dagli, Ozge; Kose, Dursun Ali; Icten, Okan; Avci, Gulcin Alp; Sahin, Onur
    The coumarilate (coum(-)) and 1,10-phenanthroline (phen) mixed ligand complexes of Co(II) (1), Ni(II) (2) Cu(II) (3) and Zn(II) (4) were synthesized and structural characterizations were performed by using elemental analysis, magnetic susceptibility, solid-state UV-Vis, FTIR spectra, thermoanalytical TG-DTG/DTA and single-crystal X-ray diffraction methods. The Co(II) and Ni(II) complexes are salt-type compounds, and they have two moles phen ligands bound as bidentate, two moles aqua ligands in coordination sphere and two moles anionic coum(-) ligand outside of the coordination unit as the counter-ion of the molecular structure. At the same time, the Co(II) and Ni(II) complexes have five moles of aqua ligands as hydrated water outside of the molecules. It was obtained that Cu(II) and Zn(II) complex structures contain one mole of phen ligand, two moles coordinated (coum(-)) ligand and a one-mole aqua ligand, and the molecules (Cu(II) and Zn(II)) have fivefold structure and obey square pyramidal geometry. Thermal decomposition of each complex started with dehydration (the first removal is the dehydration of complex Co(II) and Ni(II) as removal of hydrate-aqua molecules), and then, the decomposition of organic parts was observed. The thermal dehydration of the complexes takes place in one (Cu(II) and Zn(II)) or two (Co(II) and Co(II)) steps. The decomposition mechanism, thermal decomposition steps and thermal stability of the investigated complexes provide useful data for the interpretation of their structures. The final decomposition products were found to be metal oxides. Some biological applications (antifungal/antibacterial) were performed using structurally characterized compounds.
  • [ X ]
    Öğe
    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.