ESR Characterization on Alkaline Metal Extraction by Using Crown Ether System Spin-Labeled with Nitroxide Radical

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  • 高い親水性をもつスピン標識クラウンエーテルの金属イオン抽出機構
  • タカイ シン スイセイ オ モツ スピン ヒョウシキ クラウンエーテル ノ キ

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Abstract

A new methoxy-sufolitated crown ether spin-labeled with t-butyl nitroxide radical moiety was prepared, and the 96% pure radical crystal was successfully isolated. The nitroxide crown ether shows a pronounced solubility both in water and in nonpolar organic solvent. The distribution parameters between aqueous and organic layer were evaluated on the basis of measurements of ESR signal intensity. An excellent linear relationship was seen in the plot of observed distribution parameters vs 1/ε', values of organic layer. By taking into account the distribution of nitroxide crown ether into the aqueous layer, the extraction constants of potassium picrate were calculated as a function of the potassium picrate concentration detected in the organic layer. The potassium picrate extraction constant of nitroxide CR is remarkably improved by its pronounced hydrophilicity.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1987 (3), 283-287, 1987-03-10

    The Chemical Society of Japan

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