Solvent extraction behaviour of calixarene-type cyclophanes towards trivalent La, Nd, Eu, Er and Yb
- Saga Univ. (Japan)
In this paper we describe the solvent extraction behaviour of three calixarene-type cyclophanes towards trivalent lanthanides Ln[sup 3+] (Ln = La, Nd, Eu, Er and Yb). By using p-tert-butylcalix/6/arene hexacarboxylic acid (L1), the lanthanides were extracted from the aqueous phase at pH 2 to 3.5 into chloroform according to a cation exchange mechanism as 1:2 metal:ligand complexes. The extractability is: Nd, Eu > La > Er > Yb. In the presence of excess Na[sup +] in the aqueous phase, this order was not changed but the lanthanides were extracted as 1:1 complexes at low extractant concentration and their extractability decreased. The use of p-tert-butylcalix/4/arene tetracarboxylic acid (L2) with a smaller cavity size dissolved in chloroform or toluene results in lower distribution coefficients, D[sub Ln], compared with L1. The extraction constants of the 1:2 metal:extractant complexes for the water-toluene system follow the order Eu > Nd > Yb > Er > La. Upon addition of excess Na[sup +], both extractability and selectivity increased. The extraction behaviour of a third cyclophane (L3) with a cavity size similar to that of L1 containing four carboxylic acid groups was different from that of L1 with respect to extractability and order of extraction of the lanthanides. 21 refs., 12 figs.
- OSTI ID:
- 6341747
- Journal Information:
- Solvent Extraction and Ion Exchange; (United States), Vol. 11:2; ISSN 0736-6299
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
RARE EARTH COMPOUNDS
SOLVENT EXTRACTION
CHLOROFORM
COMPLEXES
ERBIUM COMPOUNDS
EUROPIUM COMPOUNDS
LANTHANUM COMPOUNDS
NEODYMIUM COMPOUNDS
PH VALUE
TOLUENE
YTTERBIUM COMPOUNDS
ALKYLATED AROMATICS
AROMATICS
CHLORINATED ALIPHATIC HYDROCARBONS
EXTRACTION
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROCARBONS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
SEPARATION PROCESSES
400105* - Separation Procedures
400201 - Chemical & Physicochemical Properties