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    Diphenic acid/nicotinamide complexes of CoII, CuII and ZnII. Synthesis and structural investigation
    (Pergamon-Elsevier Science Ltd, 2016) Sahin, Zarife Sibel; Sahin, Onur; Dagli, Ozge; Kose, Dursun Ali
    The complexes of diphenic acid with Co-II and CO metals and diphenic acid/nicotinamide mixed ligand with Con and ZIP metals were synthesized and characterized of structural properties by elemental analysis, FT-IR spectra, thermo analytic TG-DTG/DTA and crystal X-ray diffraction methods. The pure ligand complexes of diphenic acid (C14H16O8Co (1), C14H16O8Cu (2)) and mixed ligand complexes of diphenic acid/nicotinamide (C40H38N4O14Co (3), C40H38N4O14Zn (4)) are similar to each other and they have P2(1), P2(1/)n and P (1) over bar space groups. The diphenic acid ligands in 1 and 2 complexes were coordinated to metal cations as dianionic bridge and in the others complexes (3 and 4) it was involved as monoanionic counter ion. The complexes of 1 and 2 are linked into sheets by a combination of O-H center dot center dot center dot O hydrogen bonds and the others complexes of 3 and 4 are linked into sheets by a combination of O-H center dot center dot center dot O, N-H center dot center dot center dot O and C-H center dot center dot center dot O hydrogen bonds. All of the complexes structures have distorted octahedral geometry. According to TG/DTG-DTA analysis, thermal decomposition of complexes starts with dehydration, of coordinated aqua ligands. After the dehydration, neutral nicotinamide ligands start to decompose in mixed ligand complexes. Lastly, anionic diphenic acid ligands decompose and corresponding metal oxides remain as residual products of thermal degradation in reaction vessel. (C) 2016 Elsevier Ltd. All rights reserved.
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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.
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    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.
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    Öğe
    The synthesis and structural characterization of transition metal coordination complexes of coumarilic acid
    (Springer, 2017) Dagli, Ozge; Kose, Dursun Ali; Sahin, Onur; Sahin, Zarife Sibel
    The coumarilate (coum(-)) complexes of Co-II(1), Ni-II(2) Cu-II(3) and Zn-II(4) were synthesized and characterized by elemental analysis, magnetic susceptibility, solid-state UV-Vis, FTIR spectra, thermoanalytical TG-DTG/DTA and single-crystal X-ray diffraction methods. It was found that all of the complex structures have 2 mol (coum(-)) ligand bonded as monoanionic monodentate in the structures of 1 and 2 while they were coordinated to metal cations as monoanionic bidentate in the complexes 3 and 4. There was not any hydrate water in the metal complexes. The complexes of 1 and 2 have four moles of aqua ligand, and the other complexes have two moles. Thermal decomposition of each complex starts with dehydration, and then the decomposition of organic parts goes. The thermal dehydration of the complexes takes place in one (for the compounds of 2, 3, 4) or two (for the compound 1) steps. The decomposition mechanism and the thermal stability of the complexes under investigation were determined on the basis of their structures. Metal oxides were obtained as the final decomposition product.