Studies of the separation mechanism in ion-exchange chromatography. III. Elution order of cis-bis(ethylenediamine)cobalt(III) and cis.ALPHA.-triethylenetetraminecobalt(III) complexes on SP-sephadex C-25 and IEX510 resins.
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概要
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Chromatographic separation of <I>cis</I>-dianionobis(ethylenediamine)cobalt(III) and <I>cis</I>-α-dianionotriethylenetetraminecobalt(III) complexes has been investigated by using SP-Sephadex C-25 and IEX 510 cation-exchange resins. The elution order of the complex cations on both resins are rather similar to each other and the adjusted retention volumes of these complexes correlate very closely with the crystallographic volumes (the unit cell volumes divided by the number of molecules in a unit cell) of [Co(X)(NH<SUB>3</SUB>)<SUB>5</SUB>]Cl<SUB>2</SUB>, where X=CN<SUP>−</SUP>, Cl<SUP>−</SUP>, NO<SUB>2</SUB><SUP>−</SUP>, N<SUB>3</SUB><SUP>−</SUP>, and NCS<SUP>−</SUP>. This has been taken to indicate that the affinity of the complex cation to the functional group of the resins increases as the size of the cation, and hence the character of water-structure breaker of the cation, increases. Thus, the elution order obtained seems to be determined primarily by the difference in the affinities of the complex cations to the resins, rather than by the difference in the association constants for the ion-pairs formed between the complex cation and the eluent anion.
- 公益社団法人 日本化学会の論文
著者
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YONEDA Hayami
Department of Chemistry, Faculty of Science, Hiroshima University
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Nakazawa Hiroshi
Department Of Applied Biology Faculty Of Textile Science Kyoto Institute Of Technology
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Sakaguchi Ushio
Department of Chemistry, Faculty of Science, Hiroshima University
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Wakida Shin-Ichi
Department of Chemistry, Faculty of Science, Hiroshima University
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