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Öğe Crystal structure and thermal analysis of new mononuclear nickel (II) complexes with NNN type pyrazolyl ligands and halids(Oldenbourg Verlag, 2008) Taştekin, Mustafa; Durmuş, Sefa; Şahin, Ertan; Arıcı, Cengiz; Emregül, Kaan Cebesoy; Atakol, OrhanMononuclear Ni(II) complexes of Bis-2,6(pyrazolyl)pyridine(pp), 2(1-pyrazolyl)-6-(3,5-dimethylpyrazol-1-yl)pyridine(mpp) and bis-2,6(3,5-dimethyl-pyrazolyl-lyl)pyridine(dmpp) were prepared in MeOH:H(2)O mixtures. The complexes were characterized using elemental analysis, IR spectroscopy, X-ray diffraction and thermal analysis. The molecular structure of [Nidmpp(H(2)O)(2)Br]Br was evaluated and the Ni(II) ion was found to be in a distorted octahedral coordination environment. One of. the halogen ions was found to coordinate the Ni(H) ion whereas the other ion does not coordinate and forms hydrogen bonds with the water molecules situated on the neighboring complex molecules, resulting in a supramolecular arrangement. Thermogravimetric results showed three coordinated water molecules in the pp and mpp complexes. Conductometric and potentiometric studies of the complexes showed 2 and 1 turning points, respectively.Öğe Crystal structure and thermal decomposition of square planar Ni (II) complexes with ONS type ligands(Springer/Plenum Publishers, 2010) Durmuş, Sefa; Arıcı, Cengiz; Şahin, Ertan; Ergün, Ümit; Atakol, OrhanSimilar square planar complexes in the literature were prepared with ONS type N-(2-mercaptophenyl) salicylaldimine and Ni (II). The fourth coordination alongside the tridentate organic ligand was provided by the amine group. The complexes prepared were characterized with Elemental Analyses, IR Spectroscopy and Thermal Analyses. The molecular structures both of the complexes were also determined with X-ray diffraction. The Ni ( II) complex was observed to have a highly distorted square planar structure. The temperature range where the nitrogen containing tridentates ligand left the structure and the corresponding heat changes were compared with those in the literature. The residue after thermal decomposition above 650 degrees C was found to be NiO.Öğe Crystal structure of [2,6-bis(3,5-dimethyl-N-pyrazolyl)pyridine](azido)(chloro)copper(II)(Japan Soc Analytical Chemistry, 2003) Kurtaran, Raif; Arıcı, Cengiz; Durmu, Sefa; Ülkü, Dinçer; Atakol, OrhanIn the title compound, the coordination around the Cu atom is a distorted square-pyramid involving three N atoms from the ligand and one N atom from the azido group at the basal plane. The Cl atom is located at the apical position. The Cu atom is 0.32(5)Angstrom above the basal plane. There are three intramolecular and four weak intermolecular hydrogen bonds in the structure. IR spectra confirm the asymmetric N-3 stretching vibrations of the terminal azide group.Öğe 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, RadovanA 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.Öğe Structural analysis of bis{(N,N -dimethylformamide) (mu-formato)[mu-bis(salicylidene)-1,3-propanediaminato] nickel(II)}copper(II) and zinc(II) monohydrate hetero-trinuclear complexes(Wiley-V C H Verlag Gmbh, 2004) Ercan, Filiz; Ateş, Meltem B.; Ercan, İsmail; Durmuş, Sefa; Atakol, OrhanThe two linear hetero-trinuclear metallic complexes with Cu2+, Ni2+ and Zn2+ ions, [CuNi2 {(CHO2)(SALPD)[(CH3)(2)NCHO]}(2)],(I) and [ZnNi2{(CHO2)(SALPD)[(CH3)(2)NCHO]}(2)],(II), form crystals which belong to the monoclinic system, space group P2(1)/c, with unit cell dimensions a = 10.537(4), b = 16.612(5), c = 13.837(3) Angstrom, beta = 111.09(5)degrees, V = 2259.8(12) Angstrom(3) in (II) and a = 10.525(4), b = 16.658(5), c = 13.826(3)Angstrom, beta = 111.11(5)degrees,V = 2261.4(8) Angstrom(3) in (II), respectively. The coordinations around the M (Ni2+, Cu2+, Zn2+) ions in the title complexes are distorted octahedrals. The stereochemistries of the bridge ligands, linking to the metal ions each other, are changed between Ni...M (Cu2+, Zn2+) distances. The Ni...M (Cu2+, Zn2+) distances are 3.0469(13) and 3.0645(14), respectively. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.Öğe Synthesis and crystal structure of a homotrinuclear Ni(II) complex(Walter De Gruyter Gmbh, 2005) Durmuş, Sefa; Ateş, B. Meltem; Atakol, Orhan; Ercan, FilizA tetradentate ONNO type Schiff base was synthesized from salicyaldehyde and 1,4-diaminobutane. Thermogravimetfic analysis, elemental analysis and X-ray diffraction results showed this Schiff base to give a trinuclear complex with Ni(II) ions in presence of acetate ions. The complex crystallizes in the triclinic P (1) over bar space group with a = 9.7510(2), b = 10.6854(2), c = 12.4781(4) angstrom, alpha = 112.101(3), beta = 100.621(4) and gamma = 91.733(3)degrees. Similar to those found in the literature the terminal Ni(II) ions are coordinated to the Schiff base and have a N2O4 coordination sphere. The central Ni(II) ion has a O-6 coordination sphere formed by the phenolic oxygens and the acetate bridges. The conformation of the chelate ring formed between the Ni(H) ions and the iminic nitrogens were examined.Öğe Synthesis, crystal structure and magnetic behaviour of a mononuclear Fe(III) - schiff base metal complex(Oldenbourg Verlag, 2006) Nazır, Hasan; Akben, Nimet Sapmaz; Ateş, Meltem Bürke; Sözeri, Hüseyin; Ercan, İsmail; Atakol, Orhan; Ercan, FilizA complex from Fe(II) and a hexa-dentate linear ligand containing O2N4 donor atoms were prepared and the structure enlightened with X-ray diffraction. The Fe(II) ion in the complex was seen to be oxidized to form a Fe(III) complex, [C20H24Cl3N4O2]Fe and the three chloride ions were situated at a distance of Fe...Cl(1) 3.976(5), Fe... Cl(2) 4.479(3) and Fe... Cl(3) 7.509(4) (A) over circle outside the coordination sphere. The Fe(III) ion has an octahedral coordination sphere and as expected the two oxygen donor atoms are coordinated in a -cis position. The Fe-O, Fe-N-imin and Fe-N-amine distances are 1.880(3) (A) over circle, 1.931(4) (A) over circle and 2.004(4) (A) over circle, respectively.Öğe Thermal decomposition of some linear trinuclear schiff base complexes with acetate bridges(Springer, 2006) Durmuş, Sefa; Ergun, Ümit; Jaud, J. C.; Emregül, Kaan Cebesoy; Fuess, H.; Atakol, OrhanNi(II)-M(II)-Ni(II) nuclear structured complexes were prepared from N,N'-bis(salicylidene)-1,3-propanediamine (LH2) and its derivatives N,N'-bis(salicylidene)-2,2'-dimethyl-1,3-propanediamine (LDMH2) and N,N'-bis(salicylidene)-2-hydroxy-1,3-propanediamine (LOH3), where M represents one of the following metal ions; Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II). Two different mu-bridges are found between the metal nucleus of the complexes. The phenolic oxygens and acetate ions tend to form mu-bridges between the terminal Ni(II) ions and central metal(II) ion. The coordinatively bonded DMF molecules, in the complexes, were observed to abandon the structure between 160-180 degrees C. Further heating resulted primarily in the thermal decomposition of the complexes above 310 degrees C, whereas metal oxide residue mixtures were observed above 650 degrees C.Öğe 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, HartmutN,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.
