ION-PAIR EXTRACTION OF LANTHANOID(III) WITH CROWN ETHERS AND PICRATE ION
- 1 April 1987
- journal article
- research article
- Published by Taylor & Francis in Solvent Extraction and Ion Exchange
- Vol. 5 (2), 255-263
- https://doi.org/10.1080/07366298708918565
Abstract
The extraction of lanthanoid(III) with 15-crown-5, 18-crown-6, or dibenzo-18-crown-6, and picrate ions into chloroform was measured at 25°C. The stoichiometry of the dominant species extracted was found to be 1:2:3 with respect to lanthanbid(III), crown ether, and picrate ions. The extraction constants decrease through the lanthanoid series (except lanthanum). The constants for praseodymium or neodymium are larger than that for ytterbium or lutetium by an order of magnitude. The pattern of the plot of the extraction constants for the crown ethers vs. the lanthanoid atomic number is similar for all crown ethers tested, although the sizes of all the cations are close to the cavity size of 15C5. The present result suggests that lanthanoid(III) would not be trapped in the center of the cavity of the crown ether.Keywords
This publication has 7 references indexed in Scilit:
- Extractability of Copper(II) and Zinc(II) with Crown Ethers as PicratesBulletin of the Chemical Society of Japan, 1985
- SOLVENT EXTRACTION OF EUROPIUM(III) WITH CROWN ETHERS AND PICRATE IONSSolvent Extraction and Ion Exchange, 1984
- Lithium Salt Effects on Extractions of 15-Crown-5, 18-Crown-6, or Their Silver(I) Complexes as PicratesBulletin of the Chemical Society of Japan, 1984
- Extraction of several lanthanide and actinide radionuclides with crown ethersJournal of Radioanalytical and Nuclear Chemistry, 1983
- Solvent extraction of rare earth metals with crown ethersThe Analyst, 1983
- Lanthanide nitrate complexes of some macrocyclic polyethersJournal of the American Chemical Society, 1974
- Solvent extraction behaviours of the lanthanides in perchloric acid— tri-n-butyl phosphate systemJournal of Inorganic and Nuclear Chemistry, 1964