GROUND TERM L-QUANTUM AND J-QUANTUM NUMBER PROFILES OF THE OSCILLATOR-STRENGTHS (F(JO)) AND PH VALUES OF SOME LANTHANOIDS IN AMINOPOLYCARBOXYLATE LIGAND ENVIRONMENTS
P. Rout et al., GROUND TERM L-QUANTUM AND J-QUANTUM NUMBER PROFILES OF THE OSCILLATOR-STRENGTHS (F(JO)) AND PH VALUES OF SOME LANTHANOIDS IN AMINOPOLYCARBOXYLATE LIGAND ENVIRONMENTS, Proceedings of the Indian Academy of Sciences. Chemical sciences, 108(4), 1996, pp. 361-370
Electronic spectral studies of some lanthanoids [(viz. Pr(III), Nd(III
), Sm(III), Eu(III), Dy(III), Er(III) and Tm(III)] in aminopolycarboxy
late (viz. IMDA, NTA, HEDTA, EDTA, CDTA and DTPA) environment have bee
n undertaken with a view to evaluate the oscillator strengths (f(JO)),
Judd-Ofelt parameters (tau(lambda)), inter-electronic repulsion Racah
parameters (partial derivative E(k)) and nephelauxetic ratios (partia
l derivative E(3)/partial derivative E(1)). The parameters have been e
valuated for the entire pH range (pH 2-9) with intervals of 0.5 in ord
er to study the dependence of oscillator strengths on pH values. The e
xtent of covalency (via parameter tau(2)) and symmetry (via parameters
tau(4) and tau(6)) in the metal-ligand interaction have been estimate
d with the help of tau(lambda) parameters. The values of oscillator st
rengths and Judd-Ofelt parameters have been discussed in the light of
coordination number of lanthanoid metal ions, denticity and basicity o
f the ligands. The metal-ligand bonding pattern has been studied in th
e light of changes in Racah parameters and the nephelauxetic ratio. Th
e oscillator strength values for some specific hypersensitive transiti
ons and for the transition where U-lambda values are significantly lar
ge have been studied as a function of ground term L and J quantum numb
ers of the lanthanoids.