caa a22 4500 378917684 CHVBK 20180305123557.0 cr unu---uuuuu 161128e20040101xx s 000 0 eng 10.1524/ract.92.1.31.25407 doi (NATIONALLICENCE)gruyter-10.1524/ract.92.1.31.25407 Crown ethers as synergists in the extraction of trivalent lanthanoids with 3-phenyl-4-(4-fluorobenzoyl)-5-isoxazolone [Elektronische Daten] [Rani Pavithran, M. L. P. Reddy] This paper highlights the results of investigations carried out on the extraction of lanthanoids such as Nd(III), Eu(III) and Tm(III) from nitrate solutions into chloroform with 3-phenyl-4-(4-fluorobenzoyl)-5-isoxazolone (HFBPI) in the presence and absence of various crown ethers (CE); 18-crown-6 (18C6), dicyclohexano-18-crown-6 (DC18C6), benzo-18-crown-6 (B18C6) and dibenzo-18-crown-6 (DB18C6). The results demonstrated that these trivalent metal ions were extracted into chloroform as Ln(FBPI)3 with HFBPI alone and as Ln(FBPI)3·CE in the presence of a CE. The equilibrium constants of the above extracted complexes deduced by a non-linear regression analysis were found to increase monotonically with a decrease in ionic radii of these metal ions. The addition of a CE to the metal chelate system significantly improves the extraction efficiency of these metal ions. The complexation strength of trivalent lanthanoids with various CEs follows the order: DC18C6 > 18C6 > B18C6 > DB18C6. Solid complexes of Eu(III) with HFBPI alone and with mixtures of HFBPI and various crown ethers have been isolated and characterised by IR and 1H NMR spectral data to further clarify the nature of the extracted complexes. © 2004 Oldenbourg Wissenschaftsverlag GmbH Laboratory techniques, experiments nationallicence Analytical chemistry nationallicence Inorganic chemistry nationallicence Pavithran Rani aut Reddy M. L. P. aut Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 92/1/2004(2004-01-01), 31-38 0033-8230 92:1/2004<31 2004 92 ract https://doi.org/10.1524/ract.92.1.31.25407 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/ract.92.1.31.25407 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pavithran Rani aut NATIONALLICENCE 700 1- Reddy M. L. P. aut NATIONALLICENCE 773 0- Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 92/1/2004(2004-01-01), 31-38 0033-8230 92:1/2004<31 2004 92 ract CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter