The stereochemistry of the six geometrical isomers of the bis(ethylenediamine-N-acetato)cobalt(III) ion, (Co(edma)2)+.

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概要

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• All of the six geometrical isomers possible in [Co(edma)<SUB>2</SUB>]<SUP>+</SUP> (edma: ethylenediamine-<I>N</I>-acetate) were isolated, and the five chiral isomers were resolved into optically active isomers by a column-chromatographic method. Their structures were determined on the basis of the X-ray analysis and the visible absorption, <SUP>1</SUP>H NMR, and CD spectral data. One of the methylene protons in the glycinate-ring of the facially coordinating edma is stereospecifically exchanged by a deuteron in the basic D<SUB>2</SUB>O solution, and its deuteration rate is influenced by the ligating atoms in the <I>trans</I> position. A <SUP>1</SUP>H NMR method to determine the absolute configurations of the optically active isomers, which contain the stereospecifically deuterated edma, is reported and applied to the [Co(edma)<SUB>2</SUB>]<SUP>+</SUP> systems. The relationship between the absolute configurations and the CD spectral behaviors of these complexes is also discussed.

• 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

• Matsumoto Keiji

  Department Of Applied Physics Graduate School Of Engineering Yokohama National University

• Kawaguchi Hiroshi

  Department Of Applied Chemistry Faculty Of Engineering Utsunomiya University

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