The base-catalyzed isomerization of the (iminodiacetato)(N-methyliminodiacetato)cobaltate(III) and bis(iminodiacetato)cobaltate(III) ions.

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概要

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• The isomerization reaction among three geometrical isomers of [Co(ida)(mida)]<SUP>−</SUP> was studied in a basic aqueous solution. It has been found that the reaction scheme is <I>u</I>-<I>fac</I>\rightleftharpoons<I>mer</I>\rightleftharpoons<I>s</I>-<I>fac</I>. The rates of these isomerization paths have been determined as the functions of pH and temperature. The rate of the <I>u</I>-<I>fac</I>\rightleftharpoons<I>mer</I> change is considerably faster than that of the <I>mer</I>\rightleftharpoons<I>s</I>-<I>fac</I> change. The CD loss of the optically active <I>u</I>-<I>fac</I> isomer is caused by the isomerization process of <I>u</I>-<I>fac</I>\rightleftharpoons<I>mer</I>. The isomerization of the [Co(ida)<SUB>2</SUB>]<SUP>−</SUP> system has also been measured, and the rate data analysed according to the same scheme as that used for the [Co(ida)(mida)]<SUP>−</SUP> system. It is suggested that the isomerizations of the [Co(ida)(mida)]<SUP>−</SUP> and [Co(ida)<SUB>2</SUB>]<SUP>−</SUP> systems proceed through a conjugatebase intermediate.

• 公益社団法人 日本化学会の論文

著者

• Yasui Takaji

  Department Of Chemistry Faculty Of Science Kochi University

• Ama Tomoharu

  Department Of Chemistry Faculty Of Science Kochi University

• Kawaguchi Hiroshi

  Department Of Applied Chemistry Faculty Of Engineering Utsunomiya University

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