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KMID : 1059519840280030163
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Journal of the Korean Chemical Society
1984 Volume.28 No. 3 p.163 ~ p.169
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The Ion Transport Phenomena through the Liquid Membrane with Macrocyclic Compound (Ⅰ). Mechanism of Potassium Ion Transport through H2O-CHCl3-H2O System with Dibenzo-18-Crown-6
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Yoon Chang-Ju
Lee Shim-Sung
Koo Chang-Hyun
Kim Si-Joong
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Abstract
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The transport rates of K+ion through CHCl3 liquid membrane containing dibenzo-18-crown-6(DBC) as a carrier molecule have been determined at 25℃. The transport rates depend highly on the ion concentration and on the nature of anion. It is concluded that K+ions are transported in the form of ion-pair. In the case of potassium picrate, however, it is found that the transport proceeds with the formation of the incomplete ion-pair in the concentration less than 1.0 × 10-3M of picrate, while with the complete formation of ion-pair in the concentration more than 1.0 × 10-3M of picrate. Seven steps of the transport process are suggested and they can be illustrated in terms of energy barrier model as a function of the position of ionic species in the membrane.
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