Synthesis and Characterization of Ni(II) Schiff Base Macrocyclic Complexes

Abstract

[2+2]Cyclocondensation of L_22py = N-(2-pyridylmethyl)-N-(2-aminoethyl)-1,2-diaminoethane, L_23py = N-(2-pyridylmethyl)-N-(2-aminoethyl)-1,3-diaminopropane and 2-[3-(2-formyl phenoxy)propoxy]benzaldehye and 2-[4-(2-formyl phenoxy)butoxy]benzaldehyde in the presence of Ni(ClO₄)₂·4H₂O in equimolar ratios gave three new binuclear Ni(II) macrocyclic complexes. Resulting compounds, [{Ni(H₂L¹)](ClO₄)₂ (1), [Ni(H₂L²)](ClO₄)₂ (2) and [Ni(H₂L³)](ClO₄)₂ (3), were characterized by IR spectroscopy and elemental analysis. The Ni(II) ions in latter complexes are six coordinated.