Polydentate 1,10-Phenanthroline-5,6-Dione Derivatives and its Metal Complexes-Synthesis and Characterization
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Date
2008-07
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Addis Ababa Universty
Abstract
A new multidentate ligand with 1,10-phenanthroline backbone, 6-(2-hydroxyphenylaminop)-
1,10-phenanthroline-5-ol (HPAPO) was synthesized through a reaction between 1,10-
phenanthroline-5,6-dione (PD) and 2-aminophenol (AP) and its Ni(II) complex was successfully
prepared. The Ni(II) and Zn(II) complexes were also prepared using an alternative template
synthesis involving the respective metal ions and the ligand precursors in 1:1 (PD):2 (AP) mole
ratios. The ligand and the complexes were structurally investigated using IR, NMR (1H, 13C, HHCOSY,
HMQC, HMBC), UV-Vis and analytical studies. The complexes were further studied
through AAS, conductance and magnetic susptibility measurements. Comparison of the direct
and the template methods of synthesis reveal differences in the ligand composition. The template
method appears to stabilize a 1:2 product with respect to PD and AP. Dibasic ONNO binding in
the template and dibasic ONO binding in the non template method of complex formation are
evidenced by the spectral data. The RT magnetic susptibilities of Ni(II) complexes showed
variation while indicating two unpaired electrons for metal ion in each complex. All complexes
were non electrolyte in DMSO solution. Octahedral geometries have been suggested for the
complexes.
Key Words: 1,10-phenanthrolin-5,6-dione, o-aminophenol, 6-(2-hydroxyphenylamino)-1,10-
phenanthrolin-5-ol, template (ONNO donor) and non template (ONO donor) synthesis with
octahedral geometry, Ni(II) and Zn(II) complexes.
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Keywords
1;10-phenanthrolin-5;6-dione; o-aminophenol; 6-(2-hydroxyphenylamino)-1;10- phenanthrolin-5-ol; template (ONNO donor) and non template (ONO donor) synthesis with octahedral geometry; Ni(II) and Zn(II) complexes.