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  • Küçük Resim
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    Magnetic properties of trinuclear Ni-M-Ni complexes, M = Mn, Co and Ni
    (Elsevier, 2006) Atakol, Orhan; Boca, Roman; Ercan, İsmail; Ercan, Filiz; Fuess, Hartmut; Haase, Wolfgang; Herchel, Radovan
    A tetradentate ligand, abbr. L2- =dmSALPD(2-) = N,N'-bis(sahcylidene)-1,3-propanediaminato dianion, has been complexed with metal ions in the presence of dimethylformamide (dmf) and nitrite anion. As a result, trinuclear molecular complexes of the type [M-II- {Ni(NO2(L2-)(dmf)}(2)], where M-II = Mn(II), Co(II) and Ni(II) were obtained. The magnetic susceptibility and magnetization data were treated simultaneously during the fitting procedure. In addition to the isotropic exchange, the zero-field splitting parameters D-A were added to the spin Hamiltonian. An anti-ferromagnetic interaction was found in all complexes and the single ion magnetic anisotropy parameter for the Ni(II) peripheral centers adopt considerable values.
  • Küçük Resim
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    Two new mononuclear Ni(II) complexes with reduced ONNO type schiff base
    (Walter De Gruyter Gmbh, 2005) Durmuş, Sefa; Tatar, Leyla; Arıcı, Cengiz; Dinçer, Nazlı; Atakol, Orhan; Svoboda, Ingrid; Fuess, Hartmut
    N,N'-bis(salicylidene)-1,3-propanediamine (LH2) and N,N'-bis(salicylidene)-2,2'-dimethyl-1,3-propanediamine (DMLH2) were reduced to phenolic amines by using NaBH4. Mononuclear complexes were obtained with Ni (II) in a N3O6 coordination sphere with these amines and N3- ions, in DMF media. It was established with the XRD studies that the coordination spheres were distorted octahedral and the complex obtained with LH2 formed dimeric structures via phenolic OH bonds. The other complex was seen to have monomeric structure. The complexes were characterized by X-ray diffraction, elemental analysis, termogravimetry, IR spectroscopy and simple magnetic susceptibility (Gouy method). In addition, cyclic voltammetric studies have been performed.