Synthesis, characterization, and optical resolution of electrically neutral octahedral cobalt(III) complexes containing the tetradentate ligand.

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概要

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• Three geometrical isomers of [Co(edda)(aa)] where edda=<I>N</I>′,<I>N</I>-ethylenediaminediacetato, aa=glycinato (gly), β-alaninato (β-ala), have been synthesized and characterized. They have been completely resolved into the enantiomers, except <I>unsym-cis-fac</I>-[Co(edda)(β-ala)], by the bis(μ-<I>d</I>-tartrato)diantimonate(III) anion, [Sb<SUB>2</SUB>(<I>d</I>-tart)<SUB>2</SUB>]<SUP>2−</SUP>, form of QAE-Sephadex resin with water as the eluent, and their absolute configurations have been determined based upon the circular dichroism spectra. It has been revealed that the <I>Δ</I> enantiomer is favored more by [Sb<SUB>2</SUB>(<I>d</I>-tart)<SUB>2</SUB>]<SUP>2−</SUP> than the <I>Λ</I> enantiomer irrespective of the kind of the geometrical isomers. Consideration on the mechanism of the optical resolution has been presented.

• 公益社団法人 日本化学会の論文

著者

• YONEDA Hayami

  Department of Chemistry, Faculty of Science, Hiroshima University

• Nakazawa Hiroshi

  Department Of Applied Biology Faculty Of Textile Science Kyoto Institute Of Technology

• Ohtsuru Hisaka

  Department of Chemistry, Faculty of Science, Hiroshima University

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