COMPLEXATION OF STRONTIUM IN THE SYNERGISTIC EXTRACTION SYSTEM DICYCLOHEXANO-18-CROWN-6, VERSATIC ACID, CARBON TETRACHLORIDE
- 1 January 1986
- journal article
- research article
- Published by Taylor & Francis in Solvent Extraction and Ion Exchange
- Vol. 4 (1) , 83-93
- https://doi.org/10.1080/07366298608917854
Abstract
The synergism in the extraction of Sr⊃ +⊃ from 0.5M Sr(NO⊂3⊂) ⊂2⊂ by 0.05M dicyclohexano-18-crown-6 (DC18C6) + 0.1M Versatic 1519 (abbreviated v-acid or RCOOH, a neo carboxylic acid) in CCl⊂4⊂ has been found to stem from a strong 1:1 interaction between DC18C6 and Sr⊃2+ ⊃ However, both nitrate and carboxylate can function as the anion for the (DC18C6)Sr⊃2+⊃ moiety. At aqueous conditions corresponding to less than complete loading (i.e., [Sr⊃2+⊃[ org < 0.05M for pH < 11.7), (DC18C6)Sr(NO⊂3;)⊂2⊂ precipitates as a solid. As the pH is raised in the interval 7 < pH < 11.7 to deprotonate the V-acid, the precipitate (DC18C6)Sr(NO⊂3⊂) ⊂2⊂ becomes solubilized first with probable formation of a mixed-anion complex and finally with quantitative (0.05M) formation of the monoraeric complex (DC18C6)Sr(OOCR) ⊂2⊂ H⊂2⊂O at pH = 11.7 as confirmed by viscometric titration of 0.05M DC18C6 in wet CCl⊂4⊂ with Sr(OOCR) ⊂2⊂, Karl-Fischer titrations, vapor-phase osmometry, and IR spectrophotometry.Keywords
This publication has 12 references indexed in Scilit:
- Crystal structure of a solvent-extraction complex: Bis(dibutylphosphato)aquabarium-18-crown-6Inorganica Chimica Acta, 1985
- Ba(SCN)2(H2O) complex of thecis-syn-cisisomer of 2,5,8,15,18,21-hexaoxatricyclo[20,4,0,09,14]hexacosane(dicyclohexyl-18-crown-6) [Ba(SCN)2(H2O)(C20H36O6)]Journal of Heterocyclic Chemistry, 1984
- The solvent extraction of metal ions by crown compoundsPublished by Springer Nature ,1984
- Investigations of ion-Size-Selective Synergism in Solvent ExtractionSeparation Science and Technology, 1983
- Crown ethers as size-selective synergists in solvent extraction systems: A new selectivity parameterJournal of Inorganic and Nuclear Chemistry, 1981
- Solvent extraction of lead(II) and strontium(II) as dibenzo-18-crown-6 complexes with picrate ionJournal of Inorganic and Nuclear Chemistry, 1979
- The crystal structures of the complexes formed by benzo-18-crown-6 with barium perchlorate and with strontium perchlorate, bisperchloratobisaquo(6, 7, 9, 10, 12, 13, 15, 16, 18, 19 decahydro benzo [b]-1, 4, 7, 10, 13, 16 hexaoxacyclooctadecin)- barium and trisaquo(6, 7, 9, 10, 12, 13, 15, 16, 18, 19 decahydrobenzo [b]-1, 4, 7, 10, 13, 16 hexaoxacyclooctadecin)strontium diperchlorateInorganica Chimica Acta, 1978
- Recent developments and potential uses for carboxylic acid extractants—A reviewHydrometallurgy, 1978
- SYNTHETIC MULTIDENTATE MACROCYCLIC COMPOUNDSPublished by Elsevier ,1978
- Sodium and strontium extraction from sodium nitrate solutions by n-octane solutions of a branched aliphatic monocarboxylic acid: Mechanisms and equilibriaJournal of Inorganic and Nuclear Chemistry, 1969