Determination of the Stability Constants of the Bis(selenocyanato)mercury(II) and Tris(selenocyanato)mercurate(II) Complexes by a Polarographic Method
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概要
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Selenocyanate ions give an anodic polarographic wave with a half-wave potential of 0.033 V (<I>vs.</I> SCE) at 25°C and 0.044 V at 35°C for a 1 mM solution. The electrode process is: Hg\rightleftharpoonsHg<SUP>2+</SUP>+2e, Hg<SUP>2+</SUP>+2SeCN-\rightleftharpoonsHg(SeCN)<SUB>2</SUB>, Hg<SUP>2+</SUP>+3SeCN<SUP>−</SUP>\rightleftharpoonsHg(SeCN)<SUB>3</SUB><SUP>−</SUP>. By means of an equation which gives the relation between the anodic current and electrode potential, stability constants of the bis(selenocyanato)mercury(II) and tris(selenocyanato)-mercurate(II) complexes (β<SUB>2</SUB> and β<SUB>3</SUB>, respectively) were calculated from the polarograms. Values of logβ<SUB>2</SUB> and logβ<SUB>3</SUB> at ionic strength 0.3 are, respectively, 21.4<SUB>3</SUB> and 25.6<SUB>6</SUB> at 25°C, and 20.4<SUB>4</SUB> and 24.4<SUB>8</SUB> at 35°C.
- 公益社団法人 日本化学会の論文
著者
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Murayama Teisuke
Department of Industrial Chemistry, Faculty of Engineering, Shizuoka University
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Takayanagi Akio
Department of Industrial Chemistry, Faculty of Engineering, Shizuoka University
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