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

摘要

o-Hydroxyacetophenone-2-furoylhydrazone (H2hafh) C13H12O3N2forms the complexes of the type KLn(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 (#x3B2;), covalency (#x3B4;) and bonding parameter (b1/2) 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.