STUDIES ON SOME LATHANIDE(III) COMPLEXES OF HETEROCYCLIC LIGANDS .3. EIGHT-COORDINATED COMPLEXES OF AN UNSYMMETRICAL TETRADENTATE SCHIFF BASE

摘要

2,6-Diacetylpyridine (N-benzoyl) glycylhydrazone, dapbgh, has been prepared and characterised. Lanthanide metal complexes of the empirical formula [Ln[dapbgh)(2)]Cl-3.H2O, where Ln = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy and Y, have been synthesized and characterised by element analyses, electrical conductance, magnetic susceptibility, electronic, studies. Various bonding infrared and nmr (H-1 and C-13) parameters have been calculated from the electronic spectra of Pr(III), Nd(III), Sm(III) and Dy(III) complexes. The theoretical oscillator strengths (P-calc. calculated from the Judd-Ofelt equation were found to be in good agreement with the experimental values. An appropriate mean metal-ligand distance, R(Ln-O) Angstrom, in case of the Pr(III) complex was found to be 2.5 Angstrom. [References: 30]