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Solvent Effects on Cesium Complexation with Crown Ethers from Liquid to Supercritical Fluids.


DE2004822406

Publication Date 2002
Personal Author Wai, C. M.
Page Count 58
Abstract Nuclear magnetic resonance (NMR) techniques were used to study crown ether-water interactions in solvents of low dielectric constants such as chloroform and carbon tetrachloride. Water forms a 1:1 complex with a number of crown ethers including 12-crown-4, 15-crown-5, 18-crown-6, dicyclohexano-18=crown-6, dicyclohexano-24-crown 8, and dibenzl-24-crown-8 in chloroform. Among these crown ethers, the 18-crown-6-H2 complex has the largest equilibrium constant (K=545) and 97% of the crown is complexed to water in chloroform. Addition of carbon tetrachloride to chloroform lowers the equilibrium constants of the crown-water complexes. The partition coefficients of crown ethers (D=crown in water/crown in solvent) between water and organic solvent also vary with solvent composition.
Keywords
  • Solvents
  • Crown ethers
  • Cesium complexes
  • Chloroform
  • Nuclear magnetic resonance
  • Cesium
  • Supercritical state
  • Solvent properties
  • Radioactive waste processing
Source Agency
  • Technical Information Center Oak Ridge Tennessee
Corporate Authors Idaho Univ., Moscow. Dept. of Chemistry.; Department of Energy, Washington, DC.
Supplemental Notes Sponsored by Department of Energy, Washington, DC.
Document Type Technical Report
NTIS Issue Number 200506
Solvent Effects on Cesium Complexation with Crown Ethers from Liquid to Supercritical Fluids.
Solvent Effects on Cesium Complexation with Crown Ethers from Liquid to Supercritical Fluids.
DE2004822406

  • Solvents
  • Crown ethers
  • Cesium complexes
  • Chloroform
  • Nuclear magnetic resonance
  • Cesium
  • Supercritical state
  • Solvent properties
  • Radioactive waste processing
  • Technical Information Center Oak Ridge Tennessee
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