Constantes d'association de quelques éthers de polyéthyléne glycols avec Na+, K+, Cs+et Tl+
Constantes d'association de quelques éthers de polyéthyléne glycols avec Na+, K+, Cs+et Tl+
复制标题
聚乙二醇醚协会常量(Na+、K+、Cs+ 和 Tl+)
DOI:
10.1139/v75-314
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发表时间:
1975
影响因子:
1.1
通讯作者:
J. Juillard
中科院分区:
文献类型:
--
作者:
G. Chaput;G. Jeminet;J. Juillard
We report data concerning the association of monovalent cations with some polyethyleneglycol ethers that we have prepared.1:1 association constants KA have been obtained in methyl alcohol at 25 °C using selective glass electrode potentiometric measurements for Na+ and K+ and conductimetric measure ments for Cs+ and Tl+.The values obtained for KA and for the selectivity ratio KA(K+)/KA(Na+) increase with the number of coordinating sites.Replacement of the two methoxy terminal groups in the chain by primary amide or ester groups reduces the complexing properties of the ligand.The stereochemistry of the coordination is discussed in the case of some biphenylic polyethers.