CATION-CROWN ETHER COMPLEX-FORMATION IN WATER .2. ALKALI AND ALKALINE-EARTH CATIONS AND 12-CROWN-4, 15-CROWN-5, AND 18-CROWN-6

被引：110
|
作者：
HOILAND, H
RINGSETH, JA
BRUN, TS
机构：
[1] Department of Chemistry, University of Bergen, Bergen-U.
来源：
JOURNAL OF SOLUTION CHEMISTRY | 1979年 / 8卷 / 11期
关键词：
cations; complex formation; crown ether; Drude-Nernst continuum model; electrostriction; hydration number; intrinsic volume; ionic partial molal compressibility; isentropic partial molal compressibility; partial molal volume; scaled particle theory; Stability constants; water;
D O I：
10.1007/BF00648577
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The stability constants and the partial molal volume and isentropic partial molal compressibility changes of complex formation between cations and crown ethers in water at 25°C are presented. The cations involved are Na+, K+, Rb+, Cs+, Ca2+, and Ba2+, and the crown ethers are 12-crown-4, 15-crown-5, and 18-crown-6. Values of ΔV of complex formation have been discussed in terms of two simple models, one based on the scaled particle theory, and the others on the Drude-Nernst continuum model. The results indicate that the charge of the potassium cation in 18-crown-6 is especially well screened from the water. On this basis hydration numbers of complexed cations have been calculated. This shows that the size of the cation compared to the crown ether hole is important for the contacts between complexed cations and water. © 1979 Plenum Publishing Corporation.
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页码：779 / 792
页数：14
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