Studies on Some Inner Transition Metal Complexes of o-Hydroxyacetophenone-2-Furoylhydrazone

Abstract

o-Hydroxyacetophenone-2-furoylhydrazone (H₂hafh) C₁₃H₁₂O₃N₂ forms the complexes of the type K[Ln(hafh)₂H₂O] [Ln = La(III), Pr(III), Nd(III), Sm(III), Eu(III), Gd(III) and Dy(III)]. The complexes have been characterised by elemental analyses, molar conductance, magnetic susceptibility, infrared, electronic and proton n.m.r. spectral studies. The nephelauxetic ratio (β), covalency (δ) and bonding parameter (b^1/2) have been calculated for Pr(III), Nd(III) and Sm(III) complexes. I.r. and n.m.r. spectral studies suggest that H₂hafh behaves as dinegative tridentate ligand with the bonding sites being azomethine nitrogen, phenolate and enolate oxygens. A coordination number seven has been proposed around the metal ions in all the complexes.