Synthesis and metal ion complexation studies of proton-ionizable calix[4]azacrown ethers in the 1,3-alternate conformation

Jong Seung Kim, Ok Jae Shon, Jong Won Ko, Moon Hwan Cho, Ill Yong Yu, Jacques Vicens

Research output: Contribution to journalArticle

99 Citations (Scopus)

Abstract

A series of novel N-chromogenic calix[4]arene azacrown ethers were synthesized as selective extractants of potassium ion. 1,3-Alternate calix[4]arene azacrown ethers were prepared by reacting 25,27-dipropyloxy- 26,28-bis(5-chloro-3-oxapentyloxy) calix[4]arenes with p-toluenesulfonamide in the presence of potassium carbonate. The coupling reaction of calix[4]arene azacrown ether with 2-hydroxy-5-nitrobenzyl bromide in the presence of triethylamine in THF gave the chromogenic calix[4]arene azacrown ether in moderate yield. These compounds show high potassium selectivity over other metal ions as shown by two-phase extraction, bulk liquid membrane, and 1H NMR studies on a ligand-metal complex. It is assumed that the OH of the chromogenic group attached on nitrogen can assist the complexation by encapsulation of the metal.

Original languageEnglish
Pages (from-to)2386-2392
Number of pages7
JournalJournal of Organic Chemistry
Volume65
Issue number8
DOIs
Publication statusPublished - 2000 Apr 21
Externally publishedYes

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Ethers
Chromogenics
Complexation
Metal ions
Conformations
Protons
Metals
Ions
Ether
2-Hydroxy-5-nitrobenzyl Bromide
Potassium
Liquid-Liquid Extraction
Liquid membranes
Coordination Complexes
Encapsulation
Nitrogen
Nuclear magnetic resonance
Ligands
Membranes
calix(4)arene

ASJC Scopus subject areas

  • Organic Chemistry

Cite this

Synthesis and metal ion complexation studies of proton-ionizable calix[4]azacrown ethers in the 1,3-alternate conformation. / Kim, Jong Seung; Shon, Ok Jae; Ko, Jong Won; Cho, Moon Hwan; Yu, Ill Yong; Vicens, Jacques.

In: Journal of Organic Chemistry, Vol. 65, No. 8, 21.04.2000, p. 2386-2392.

Research output: Contribution to journalArticle

Kim, Jong Seung ; Shon, Ok Jae ; Ko, Jong Won ; Cho, Moon Hwan ; Yu, Ill Yong ; Vicens, Jacques. / Synthesis and metal ion complexation studies of proton-ionizable calix[4]azacrown ethers in the 1,3-alternate conformation. In: Journal of Organic Chemistry. 2000 ; Vol. 65, No. 8. pp. 2386-2392.
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AU - Vicens, Jacques

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AB - A series of novel N-chromogenic calix[4]arene azacrown ethers were synthesized as selective extractants of potassium ion. 1,3-Alternate calix[4]arene azacrown ethers were prepared by reacting 25,27-dipropyloxy- 26,28-bis(5-chloro-3-oxapentyloxy) calix[4]arenes with p-toluenesulfonamide in the presence of potassium carbonate. The coupling reaction of calix[4]arene azacrown ether with 2-hydroxy-5-nitrobenzyl bromide in the presence of triethylamine in THF gave the chromogenic calix[4]arene azacrown ether in moderate yield. These compounds show high potassium selectivity over other metal ions as shown by two-phase extraction, bulk liquid membrane, and 1H NMR studies on a ligand-metal complex. It is assumed that the OH of the chromogenic group attached on nitrogen can assist the complexation by encapsulation of the metal.

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