Metal complexes of amino acids. VIII. Carbon-13 nuclear magnetic resonances of cobalt(III) complexes containing L-aspartic and L-glutamic acids.
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概要
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The <SUP>13</SUP>C NMR spectra of cobalt(III) complexes containing L-aspartic acid or L-glutamic acid as unidentate, bidentate, or bridged ligand were measured, and the relationship between the coordination types and the changes in chemical shift of carboxyl carbons in these amino acid complexes was discussed. Two structural isomers were newly separated for the <I>trans</I> (O)-[Co en<SUB>2</SUB>(L-aspH<SUB>2</SUB> or L-gluH<SUB>2</SUB>)<SUB>2</SUB>]X<SUB>3</SUB> complex by a column chromatographic method. The structures of the earlier eluted isomers for the <I>trans</I>(O)-[Co en<SUB>2</SUB>(L-aspH<SUB>2</SUB>)<SUB>2</SUB>]X<SUB>3</SUB> and -[Go en<SUB>2</SUB>(L-gluH<SUB>2</SUB>)<SUB>2</SUB>]X<SUB>3</SUB> complexes were assigned to <I>trans</I>(O<SUB>0)</SUB> O<SUB>γ</SUB>) and <I>trans</I>(O<SUB>0</SUB>, O<SUB>δ</SUB>) (O<SUB>0</SUB>, O<SUB>γ</SUB> and O<SUB>δ</SUB> indicate the coordinated oxygen atoms of C<SUB>0</SUB>OO, C<SUB>γ</SUB>OO, and C<SUB>δ</SUB>OO), respectively, and the structures of the later eluted isomers for the both complexes to <I>trans</I>(O<SUB>0</SUB>, O<SUB>0</SUB>), on the basis of the shift patterns of carboxyl carbons.
- 公益社団法人 日本化学会の論文
著者
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Yasui Takaji
Faculty of Arts and Science, Kochi University
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Ama Tomoharu
Faculty of Arts and Sciences, Kochi University
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Ama Tomoharu
Faculty of Arts and Science, Kochi University
関連論文
- Metal Complexes of Amino Acids. V. μ-Aminocarboxylato Bi- and Tri-nuclear Complexes of Cobalt(III)
- Metal complexes of amino acids. VIII. Carbon-13 nuclear magnetic resonances of cobalt(III) complexes containing L-aspartic and L-glutamic acids.
- Metal complexes of amino acids. IX. Carbon-13 nuclear magnetic resonances of cobalt(III) complexes.