Polydentate 1,10-Phenanthroline-5,6-Dione Derivatives and its Metal Complexes-Synthesis and Characterization

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Addis Ababa Universty


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.



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.