2-hydroxy-1-napthalydene (1) on condensation with 2-ethoxyanilline (2) gives Schiff base N-[2-hydroxy-1- napthalydene]-2-ethoxyanilline (3). Formation of Schiff base confirmed by TLC, M.P., IR and C,H,N analysis. Further formation of complexes of transition elements like Mn(II), CO(II), Ni(II), Cu(II) and Zn(II) with organic ligand Schiff base N-[2-hydroxy-1-napthalydene]-2-ethoxyanilline was studied by the potentiometric technique at 27±0.10C in 60%(v/v) Dioxane - water medium at 0.1M (NaClO4) ionic strength. The stability constants of these binary complexes of N-[2-hydroxy-1-napthalydene]-2-ethoxyanilline with transition elements were evaluated and Order of stability constant found as Cu>Zn>Ni >CO>Mn.
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