• Title/Summary/Keyword: Calix[4]arene

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A Pyrenyl-Appended Triazole-Based Calix[4]arene as a Fluorescent Sensor for Iodide Ion

  • Kim, Jong-Seung;Park, Sun-Young;Kim, Sang-Hoon;Thuery, Pierre;Souane, Rachid;Matthews, Susan E.;Vicens, Jacques
    • Bulletin of the Korean Chemical Society
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    • v.31 no.3
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    • pp.624-629
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    • 2010
  • The synthesis and evaluation of a novel calix[4]arene-based fluorescent chemosensor 1 for the detection of I. is described. The fluorescent changes observed upon addition of various anions show that 1 is selective for I. over other anions. Addition of I. results in ratiometric measurements with 1 : 1 complex ratio.

Inclusion Extraction of Alkali Metals by Emulsion Liquid Membranes and Nano-baskets of p-tert-Calix[4]arene Bearing Di-[N-(X)sulfonyl Carboxamide] and Di-(1-propoxy) in ortho-cone Conformation

  • Mokhtari, Bahram;Pourabdollah, Kobra
    • Bulletin of the Korean Chemical Society
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    • v.33 no.5
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    • pp.1509-1516
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    • 2012
  • Nano-assisted inclusion separation of alkali metals from basic solutions was reported by inclusion-facilitated emulsion liquid membrane process. The novelty of this study is application of nano-baskets of calixarene in the selective and efficient separation of alkali metals as both the carrier and the surfactant. For this aim, four derivatives of $p-tert-calix$[4]arene bearing different sulfonamide moieties were synthesized and their inclusion-extraction parameters were optimized including the calixarene scaffold $\mathbf{3}$ (4 wt %) as the carrier/demulsifier, the commercial kerosene as diluent in membrane, sulphonic acid (0.2 M) and ammonium carbonate (0.4 M) as the strip and the feed phases, the phase and the treat ratios of 0.8 and 0.3, mixing speed (300 rpm), and initial solute concentration (100 mg/L). The selectivity of membrane over more than ten interfering cations was examined and the results reveled that under the optimized operating condition, the degree of inclusion-extraction of alkali metals was as high as 98-99%.

Recovery of cesium ions from seawater using a porous silica-based ionic liquid impregnated adsorbent

  • Wu, Hao;Kudo, Tatsuya;Kim, Seong-Yun;Miwa, Misako;Matsuyama, Shigeo
    • Nuclear Engineering and Technology
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    • v.54 no.5
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    • pp.1597-1605
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    • 2022
  • A porous silica-based adsorbent was prepared by impregnating the pores of a silica support with the extractant 1,3-[(2,4-diethylheptylethoxy)oxy]-2,4-crown-6-calix[4]arene (Calix[4]arene-R14) and an additive agent 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (C2mim + NTf-2) as the materials to remove cesium(I) (Cs+) ions from seawater. The as-prepared adsorbent showed excellent adsorption performance toward Cs+ ions, with adsorption equilibrium reached within 2 h and an adsorption amount of 0.196 mmol/g observed. The solution pH, temperature, and the presence of coexisting metal ions were found to have almost no effect on Cs+ adsorption. The adsorption mechanism was considered to proceed via ion exchange between Cs+ and C2mim+. In addition, the particle-induced X-ray emission analysis results further clarified that the adsorbed Cs+ ion species on the adsorbent was in the form of both CsCl and CsBr.