Effect of phase modifiers TBP and iso-decanol on the extraction and complexation of Eu³⁺ with CMPO

ABSTRACT

The effect of tri-n-butyl phosphate (TBP) and iso-decanol as phase modifiers on the complexation of Eu³⁺ with octyl-phenyl N,N-diisobutyl carbamoyl methyl phosphine oxide (CMPO) was studied. On an increase of iso-decanol the extraction efficiency of Eu³⁺ decreases. The metal–ligand stoichiometry was found to be 1:3. The Eu complex of CMPO–TBP was more symmetric compared to CMPO–iso-decanol. The Eu³⁺ complex exhibited D_3h and C_3h symmetry for 30% and 5% iso-decanol, while that for TBP was C_6v. The radiative, non-radiative life time, electric and magnetic dipole transition probabilities, branching ratio, quantum efficiency etc. were evaluated. The covalency between Eu³⁺ and CMPO is as follows: CMPO–TBP < CMPO-5% iso-decanol < CMPO-30% iso-decanol.

KEYWORDS:

• CMPO
• extraction
• iso-decanol
• J–O parameters
• TBP

Acknowledgements

The authors wish to acknowledge the constant support of Dr. P.K. Pujari, Head, Radiochemistry Division, Dr. P.K. Mohapatra, Head, Actinide Chemistry Section and Dr. R.M. Kadam, Head, Actinide Spectroscopy Section, Bhabha Atomic Research Centre, Mumbai, India.