Browsing by Author "Adefris, Efrem"

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    Synthesis and Characterization of 1, 4- Dihydroquinoxaline-2,3-Dione Derivativesbased Co (Ii) and Ni (Ii) Complexes
    (Addis Ababa University, 2020-08-23) Adefris, Efrem; Chebude, Yonas (PhD)
    In recent years, there has been enhanced interest in the synthesis and characterization of transition metal complexes containing Schiff bases as ligands due to their importance. According to this concept, two Schiff base complexes, [CoL2Cl2] and [NiL2]Cl2 were synthesized based on the Schiff base ligand that was a result of condensation of 1, 4-dihydroquinoxaline-2, 3-dione and 3-hydroquinoxaline-2(1H)- one. In the process of formation of the ligand and complexes, chemicals like OPD, diethyl oxalate, hydrazine, ethylenediamine, Co (II) and Ni (II) chloride salts, and solvents such as diethyl ether, methanol, butanol, were used. The synthesized ligand and complexes were characterized using IR, UV-Vis., molar conductivity, AAS, and other physical measurements such as melting point and solubility were determined. Based on the physico-chemical analysis, octahedral structure of Co (II) complex and square planar structure of Ni (II) complex were proposed.
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    Synthesis and Characterization of 1, 4- Dihydroquinoxaline-2,3-Dione Derivativesbased Co (Ii) and Ni (Ii) Complexes
    (Addis Ababa University, 2020-08-08) Adefris, Efrem; Chebude, Yonas (PhD)
    In recent years, there has been enhanced interest in the synthesis and characterization of transition metal complexes containing Schiff bases as ligands due to their importance. According to this concept, two Schiff base complexes, [CoL2Cl2] and [NiL2]Cl2 were synthesized based on the Schiff base ligand that was a result of condensation of 1, 4-dihydroquinoxaline-2, 3-dione and 3-hydroquinoxaline-2(1H)- one. In the process of formation of the ligand and complexes, chemicals like OPD, diethyl oxalate, hydrazine, ethylenediamine, Co (II) and Ni (II) chloride salts, and solvents such as diethyl ether, methanol, butanol, were used. The synthesized ligand and complexes were characterized using IR, UV-Vis., molar conductivity, AAS, and other physical measurements such as melting point and solubility were determined. Based on the physico-chemical analysis, octahedral structure of Co (II) complex and square planar structure of Ni (II) complex were proposed.