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<p>Tetraacetic acid and crossed carboxylic acid derivatives of calix[4]arene were prepared and investigated for extraction of various metal ions in the absence and presence of sodium ion. The extraction equilibrium constants and separation factors of Cu(II), Zn(II), and Co(II) with three carboxylic acid derivatives of calix[4]arene were determined, both in the absence and presence of sodium ion, to evaluate the effect of allosteric coextraction of sodium and the other metal ions. Extraction in the presence of sodium ion was enhanced by an allosteric effect compared with that in its absence. The extent of enhancement depended on the extraction reagents, as the crossed carboxylic acid derivatives of calix[4]arene possess longer carboxylic acid groups that relieve steric repulsion between two metal cations. The extent of enhancement also depended on the concentration of coexisting sodium ion.</p>

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Effect of reducing steric repulsion on allosteric coextraction of sodium and other metals using calix[4]arene derivatives with two different lengths of carboxylic groups

  • 期刊论文

  • 发表日期：

    2026年4月4日

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  • Keisuke Ohto,
  • Shigemasa Kuwata,
  • Akikazu Shioya,
  • Shintaro Morisada,
  • Hidetaka Kawakita,
  • Kazuharu Yoshizuka,
  • Katsutoshi Inoue

摘要

Tetraacetic acid and crossed carboxylic acid derivatives of calix[4]arene were prepared and investigated for extraction of various metal ions in the absence and presence of sodium ion. The extraction equilibrium constants and separation factors of Cu(II), Zn(II), and Co(II) with three carboxylic acid derivatives of calix[4]arene were determined, both in the absence and presence of sodium ion, to evaluate the effect of allosteric coextraction of sodium and the other metal ions. Extraction in the presence of sodium ion was enhanced by an allosteric effect compared with that in its absence. The extent of enhancement depended on the extraction reagents, as the crossed carboxylic acid derivatives of calix[4]arene possess longer carboxylic acid groups that relieve steric repulsion between two metal cations. The extent of enhancement also depended on the concentration of coexisting sodium ion.