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

Wai, Chien M. ; Rustenholtz, Anne ; Wang, Shaofen ; Lee, Su-Chen ; Herman, Jamie ; Porter, Richard A.

University of Idaho (United States)

关键词: 12 Management Of Radioactive Wastes, And Non-Radioactive Wastes From Nuclear Facilities;    Organic Solvents;    Chloroform;    Radioactive Waste Processing;    Cesium Complexes;   

DOI  :  10.2172/822406
RP-ID  :  DOE/ER/14913
RP-ID  :  FG07-98ER14913
RP-ID  :  822406

美国|英语

来源: UNT Digital Library

【 摘 要 】

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.