クラウンエーテル錯陽イオンの水/ニトロベンゼン間分配平衡のイオン移動ポーラログラフィーによる研究(<特集>表面・界面・薄膜と分析化学)

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タイトル別名
  • Ion-transfer-polarographic study of distribution equilibrium of metal complex cations with several crown ethers between nitrobenzene and water.
  • クラウンエーテル錯陽イオンの水／ニトロベンゼン間分配平衡のイオン移動ポーラログラフィーによる研究
  • クラウンエーテル サク ヨウイオン ノ ミズ ニトロベンゼンカン ブンパイ

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Transfers of Li+, Na+ and K+ at a water/nitrobenzene(w/NB) interface facilitated by 15-crown-5(15C5) and benzo-15C5(B15C5) were examined ion-transfer-polarographically at 25°C. The stability constants (βNB1) of the 1:1 complexes of the metal ions (M +) with 15C5 and B15C5 in the NB-phases were obtained from the metal ion-concentration dependence of the half-wave potentials. The distribution constants (KD, ML) of the metal-complex cations ML z+ (z =1, 2) with L=15C5, B15C5 and 18-crown-6(18C6) derivatives, in which the fir-values of the complexes with 18C6 derivatives were reported before, were calculated from KD, ML=KD, LKD, MβNB1(M)/βW1(M)=KD, L×KM/ML/βW1(M), where KD, i and β W1(M) denote the distribution constants of species i (i=ML, L, M) between the w- and the NB-phases and the stability constants of MLz+ in the w-phase, respectively. The values of log KD, ML were small when the coordination numbers of water molecules coextracted with MLz+ into the NB-phase were large. The logarithmic values of the potentiometric selectivity coefficients, which were expressed by logkpotNaM'=log(KM'/M'L/KNa/NaL), of Na+ against M'z+ were also estimated.

収録刊行物

  • 分析化学

    分析化学 40 (11), 779-784, 1991

    公益社団法人 日本分析化学会

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