Hydroxide ion-selective polymeric membrane-coated wire electrode based on oxomolybdenum(V) tetraphenylporphyrin complex.

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概要

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• A coated wire electrode (CWE) was prepared by use of a poly(vinyl chloride)-supported liquid membrane containing oxoethoxo(5,10,15,20-tetraphenylporphyrinato)molybdenum(V) as a carrier. CWE based on such a metallo-porphyrin complex exhibits near-Nernstian responses to varying concentrations of NaOH, NaF, and C<SUB>2</SUB>H<SUB>5</SUB>OH, especially to NaOH over a wide concentration range. The pOH response curve was influenced by certain anions other than OH<SUP>−</SUP> ion, but not by cations such as Li<SUP>+</SUP>, Na<SUP>+</SUP>, K<SUP>+</SUP>, and Cs<SUP>+</SUP>. The mixed solution method gave a selectivity sequence OH<SUP>−</SUP>>>ClO<SUB>4</SUB><SUP>−</SUP>>NO<SUB>2</SUB><SUP>−</SUP>>F<SUP>−</SUP>∼SCN<SUP>−</SUP>>I<SUP>−</SUP>>NO<SUB>3</SUB><SUP>−</SUP>>SO<SUB>3</SUB><SUP>−</SUP>>Br<SUP>−</SUP>>SO<SUB>4</SUB><SUP>2−</SUP>, with a preference for OH<SUP>−</SUP> over ClO<SUB>4</SUB><SUP>−</SUP> by 10<SUP>4.6</SUP> and over F<SUP>−</SUP> (or SCN<SUP>−</SUP>) by 10<SUP>6.2</SUP>. In addition, Cl<SUP>−</SUP> ion was found to have little interfering effect under conditions used in the measurements of selectivity coefficients. Both response-time profile and pOH-response curve scarcely varied even when CWE was stored in distilled water for 167 days.

• 公益社団法人 日本化学会の論文

著者

• Kokufuta Etsuo

  Insitute Of Applied Biochemistry University Of Tsukuba

• Abe Hideo

  Insitute of Applied Biochemistry, University of Tsukuba

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• Hydroxide ion-selective polymeric membrane-coated wire electrode based on oxomolybdenum(V) tetraphenylporphyrin complex.

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