Browsing by Author "Mamo, Diborah"

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    Synthesis and Structural Studies of Mixed Ligand Complexes Derived from Dimethylglyoximate and 4, 4'-Bipyridine Using Ni2+, Cu 2+ And Zn 2+ Metal Ions
    (Addis Ababa University, 2020-08-08) Mamo, Diborah; Chebude, Yonas (PhD)
    Ni (II), Cu (II) and Zn (II) complexes have been synthesized using solvo-thermal synthesis method. Divalent Ni and Cu chlorides hydrates were reacted with dimethylglyoxime and 4, 4'-bipyridine in 1:2:2 mole ratio and zinc chloride was reacted with the same ligands in 1:2:1 ratio. Methanol was used as medium in all these reactions. The products obtained under reflux conditions (NDB, CDB, ZDB) were structurally investigated on the basis of elemental (C, H, N) analysis, FTIR spectra, magnetic susceptibility measurements and XRD studies. The studies support the formation of crystalline mixed ligand complexes with metal: uni-negative dimethylglyoximate (DMG):4, 4'-bipyridine (4, 4'-bpy) mole ratio as 1:2:2 for Ni (II) and Cu (II) complexes and 1:2:1 for Zn (II) complex. In these DMG behaves as a bidentate ligand and 4, 4'-bpy is a monodentate ligand. The Ni (II) complex has subnormal magnetic moment. Octahedral geometry for Ni (II)and Cu (II) complexes and five coordinate square pyramidal geometry for Zn (II) complex were proposed.