Efficient ion-pair extraction of potassium chloride from aqueous phase into nitrobenzene containing dicyclohexyl-18-crown-6 as cation binder and diphenylthiourea as anion binder

Mihab M. Murad, Takashi Hayashita, Kazuki Shigemori, Seiichi Nishizawa, Norio Teramae

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

In combination with an ion pair extraction of potassium salts by dicyclohexyl-18-crown-6 (DC18C6), extraction behavior of anions with a diphenylthiourea (DPTU) from aqueous phase into nitrobenzene has been examined. The extraction selectivity of potassium salts follows a Hofmeister series: NO 3 - >Br - >Cl - >OAc - . The extractability of KCl by DC18C6 is significantly enhanced upon the addition of DPTU in organic solution. The slope analysis of the extraction equilibrium reveals a 1:1 complex formation between DPTU and Cl - . The hydrogen-bonding interaction of DPTU with Cl - is confirmed by the 1 H NMR analysis in d 5 -nitrobenzene. For qualitative evaluation, solid-liquid extraction of KCl into d 5 -nitrobenzene containing DPTU and DC18C6 has been examined by 1 H NMR analysis. Similar to the liquid- liquid extraction, an efficient synergistic effect of DPTU for the extraction of KCl is clarified.

Original languageEnglish
Pages (from-to)1185-1189
Number of pages5
Journalanalytical sciences
Volume15
Issue number12
DOIs
Publication statusPublished - 1999 Dec

Keywords

  • Anion recognition
  • Crown ether
  • Hydrogen-bonding
  • Ion- pair extraction
  • Thiourea receptor

ASJC Scopus subject areas

  • Analytical Chemistry

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