Thermochromism of metal chelates with triphenylmethane complexons in aqueous solutions. II. Inhibitive effects of the protolysis of aqua Cu2+ ion on the thermochromism of Cu(II)-xylenol orange chelate.
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概要
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Temperature-dependent protolytic equilibrium, Cu(OH<SUB>2</SUB>)<I><SUB>n</SUB></I><SUP>2+</SUP> \overset<I>k</I><SUB>1</SUB>\underset<I>k</I><SUB>−1</SUB>\rightleftharpoons Cu(OH)(OH<SUB>2</SUB>)<SUB><I>n</I>−1</SUB><SUP>+</SUP>+H<SUP>+</SUP>, was found to inhibit thermochromic changes of Cu(II)-Xylenol Orange (XO) chelate in unbuffered weakly acid aqueous solutions. The rate constants, <I>k</I><SUB>1</SUB> and <I>k</I><SUB>−1</SUB> at 25 °C and <I>I</I>=0.1 mol dm<SUP>−3</SUP> were evaluated to be 10<SUP>3</SUP>–10<SUP>4</SUP> s<SUP>−1</SUP> and <I>ca.</I> 2×10<SUP>9</SUP> mol<SUP>−1</SUP> dm<SUP>3</SUP> s<SUP>−1</SUP>, respectively.
- 公益社団法人 日本化学会の論文
著者
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Yamada Mutsuo
Department Of Surgery Hoshi General Hospital
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FUJIMOTO Masatoshi
Department of Chemistry, Faculty of Science, Hokkaido University
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Nakada Shoji
Department of Chemistry, Faculty of Science, Hokkaido University
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Ito Tasuku
Department of Applied Molecular Science, Institute for Molecular Science
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