Polarogpraphy of Europium(III) in Acetonitrile in the Presence of Thiocyanate and Halide Ions
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概要
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Studies were carried out on the polarographic behavior of europium in acetonitrile in the presence of SCN<SUP>−</SUP>, Br<SUP>−</SUP>, I<SUP>−</SUP> and Cl<SUP>−</SUP>. Two reduction waves were found in the Eu(III)–SCN<SUP>−</SUP> system, one corresponding to the reduction of [Eu(NCS)<SUB>6</SUB>]<SUP>3−</SUP> and the other to the reduction of [Eu(NCS)<SUB>2</SUB>]. In the Eu(III)–Br<SUP>−</SUP> system, the reduction potential of Eu(III)–bromide complex species was more positive than that of the [HgBr<SUB>4</SUB>]<SUP>2−</SUP>/Hg couple. In the Eu(III)–I<SUP>−</SUP> system, iodide ions were oxidized in acetonitrile by europium(III). The formation constants of Eu(III)–SCN<SUP>−</SUP> system were found to be: logβ<SUB>6</SUB>=24.4 for [Eu(NCS)<SUB>6</SUB>]<SUP>3−</SUP> and logβ<SUB>2</SUB>=6.0 for [Eu(NCS)<SUB>2</SUB>. The degree of complexation of europium(III) and mercury(II) with bromide ion was also determined.
- 公益社団法人 日本化学会の論文
著者
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MISUMI Seizo
Inorganic Chemistry Laboratory, Faculty of Science, Kushu University
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Aihara Makoto
Inorganic Chemistry Laboratory, Faculty of Science, Kyushu University
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