Non-covalent interactions in metal complexes. II. Induction of asymmetry in cobalt(III) complexes with amino acid-schiff bases. Importance of CH .PI.-interaction in determining configuration of complexes.
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概要
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Cobalt(III) complexes, [Co(<I>l</I>-mop=aa)<SUB>2</SUB>]<SUP>−</SUP> and [Co(cop=aa)<SUB>2</SUB>]<SUP>−</SUP> (aa=ala<SUP>−</SUP>, val<SUP>−</SUP>, leu<SUP>−</SUP>, phe<SUP>−</SUP>), where H<SUB>2</SUB>(<I>l</I>-mop=aa) and H<SUB>2</SUB>(cop=aa) denote amino acid-Schiff bases of <I>l</I>-menthyl 3-(<I>o</I>-hydroxybenzoyl)propionate and cholesteryl 3-(<I>o</I>-hydroxybenzoyl)propionate, respectively, were prepared in solution. The intensity of the CD peak induced at 520 nm changes with the solvent used for preparation of the complex, decreasing in the order: ethanol, methanol, dimethyl sulfoxide, <I>N</I>,<I>N</I>-dimethylformamide and acetonitrile. Since the order corresponds to the increasing order of the CH···π-interaction between the solvent and benzene, it seems that the CH···π-interaction between the chiral group and the aromatic nucleus in the ligand plays an important role in determining the configuration of the complexes.
- 公益社団法人 日本化学会の論文
著者
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Okawa Hisashi
Department Of Chemistry Faculty Of Science Kyushu University
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Kida Sigeo
Department of Chemistry Wakayama University
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Numata Yoshihiko
Department of Chemistry, Faculty of Science, Kyushu University
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Mio Ayako
Department of Chemistry, Faculty of Science, Kyushu University
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