Synthesis and spectral characterization of methyl-2-pyridyl ketone benzoyl hydrazone and its complexes with rare earth nitrates

摘要

The hydrazone ligand, methyl-2-pyridyl ketone benzoyl hydrazone (L), and its complexes with rare earth nitrates have been synthesized. These new complexes with the general formula of Ln(L)(2)(NO3)(3)center dot nH(2)O (where Ln La, n = 5.5; Ce, Pr, n = 5; Nd, Eu, n = 4) were characterized by mass spectra, elemental analysis, IR spectra, thermal analysis, UV spectra, molar conductivity, and luminescent spectra. All the complexes are stable in air. The results show that the lanthanide ions in each complex are coordinated through oxygen and nitrogen atoms of the ligand, the oxygen atoms of the nitrate, and coordinated water molecules. The amide-oxygen atoms of L coordinate to the Ln ions in its keto-form. Tentative structures for the complexes have been proposed.