An aroylhydrazone as chelating agent : 4f metal complexes of 2, 6-diacetylpyridine bis(2-furoylhydrazone)

Abstract

Two types of complexes, [Ln2Cl4(H2dapf) (H2O)6]Cl2, and [Ln(Hdapf)(OH)2]2 [Ln = La(III), Pr(III), Nd(III), Sm(III), Eu(III), Gd(III) and Dy(III); H2dapf = 2,6-diacetylpyridine bis(2-furoylhydrazone)], having coordinated neutral (H2dapf) or uninegative (Hdapf) hydrazones, respectively, have been isolated from the reaction of the lanthanide chloride and the hydrazone in neutral and slightly alkaline solutions, respectively. The complexes were characterized by elemental analyses, molar conductance, TGA and DTA, magnetic susceptibility, electronic, infrared and NMR (1H and 13C) spectral data. The nephel auxetic ratio (β), covalency (δ) and bonding (b1/2) parameters have been evaluated for the Nd(III) complexes.