Studies on Intensity of f↔f Transitions in Sm(III), Ho(III) and Er(III) Complexes with Some Schiff Bases

Abstract

The electronic spectral investigations on metal chelates of
lanthanon in aqueous media have been made to explain the intensity
of  f ↔ f  transition in terms of parameters, viz., oscillator strength
(P) and Judd-Ofelt parameters (T_λ). The metal chelates have been
derived from the interaction of lanthanon(II) ion, namely, Sm(IlI),
Ho(IlI) and Er(III) with the six Schiff bases, namely, 2-(α-2-oxopentylideneimino)
phenol (H₂PAA), 2-(α-2-oxopropylbenzylideneimino)
phenol (H₂PBA), 2-(α-2-benzoylmethylbenzylideneimino)
phenol (H₂PDB), o-(N-α-pyrroledeneimino) propanoic acid
(H₂PCA), o-(N-α-pyrroledeneimino) isopropyl ethanoic acid
(H₂PCV) and o-(N-α-pyrroledeneimino) ethane sulphonic acid
(H₂PCT). These ligands were derived by the condensation of o-
amino phenol with acetyl acetone, benzoyl acetone and dibenzoyl
methane and pyrrole-2-carboxaldehyde with  β-alanine, L-valine and
taurine, respectively.