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Title: SYNTHESIS AND STRUCTURAL STUDIES OF MULTINUCLEAR METAL CHELATES DERIVED FROM A NEW HETROCYCLIC CHELATING LIGAND
Authors: ENGIDAYEHU, ASRATE
Advisors: Prof. V. J. T. RAJU
Dr. YONAS CHEBUDE
Keywords: Heterocyclic compounds
Triazines
Cyanuric chloride
Hydrazine
hydrate
semicarbazide
hydrogen chloride
ligand
Multidentate
Multinuclear
metal complex
Copyright: 2007
Date Added: 15-Nov-2007
Publisher: Addis Ababa University
Abstract: 2,4-dihydroxy-5-acetylacetophenone(DAAP), 2,4-dihydroxy-5-acetylacetophenone dihydrazone (DAAD), and 4,6-Bis-(1-[(4,6-dichloro-[1,3,5]-triazine-2-yl)-hydrazono]-ethyl)-benzene-1,3-diol (BDTHEBD) as starting materials were synthesized and characterized by physical and spectral studies.4,6-Bis-(1-[(4,6-disemicarbazino-[1,3,5]-triazine-2-yl)-hydrazono]-ethyl)-benzene-1,3-diol (BDSTHEBD) was prepared by the reaction of 4,6-Bis-(1-[(4,6-dichloro-[1,3,5]-triazine-2-yl)-hydrazono]-ethyl)-benzene-1,3-diol(BDTHEBD) with semicarbazide hydrogen chloride in a 1:4 molar ratio in ethanol/methanol/nitromethane(being 1:1:8). The synthesis of complexes with transition metal (II) ions (Co2+and Ni2+) were undertaken and the resulting complexes were characterized by 1H NMR, IR, UV-Vis, and AAS spectroscopic techniques. In addition, thermal analysis, Magnetic susceptibility, conductivity measurements and chloride estimation were also through. Syntheses of the metal complexes were carried out using methanol/triethyl amine (being 1:5) mixture as a solvent. Analytical results reveal that the complexes have 1:4 ligand and metal ratio. Furthermore, based on spectroscopic results (NMR, IR, UV-Vis, and AAS), analytical data and Magnetic moments, enolization and deprotonation of BDSTHEBD were concluded. Four chelating sequences per ligand (NNN, NNO, NNO, and NNN) were identified through which four metal ions (Co2+ and Ni2+) were coordinated. Subnormal magnetic moments at room temperature suggest metal-metal interactions in the complexes. Octahedral geometry was proposed for the complexes.
Description: A PROJECT SUBMITTED TO THE SCHOOL OF GRADUATE STUDIES ADDIS ABABA UNIVERSITY IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE IN CHEMISTRY
URI: http://hdl.handle.net/123456789/258
Appears in:Thesis - Chemistry

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