ISSN:
1572-8927
Schlagwort(e):
Rare earth elements
;
fluoride complexation
;
stability constant
;
solvent exchange
;
tributyl phosphate
;
sodium perchlorate
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Abstract Rare earth fluoride stability constants for Ce, Eu, Gd, Tb and Yb at 25°C have been determined by examining the influence of fluoride ions on the distribution of rare earths between tributyl phosphate (TBP) and 0.68M NaClO4. Our results indicate that rare earth mono and difluoro complexation constants show a steady increase as a function of atomic number from La to Tb but remain relatively constant after Dy. This behavior is similar to that which has been observed for dicarboxylic acids. Stepwise stability constant ratios, K2/K1, obtained in our work (where K1=[MF2+][M3+]−1[F−]−1 and K2=[MF 2 + ]−1[MF2+]−1[F−]−1) indicated that, for all rare earths, K2/K1=0.09±0.03.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00647414
Permalink
