Metal complexes of amino acids. XII. The deuteration of .ALPHA.-hydrogen atoms in cobalt(III) complexes containing .ALPHA.-amino carboxylates.

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概要

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• The second-order rate constants (rate=<I>k</I><SUB>D(base)</SUB>[Complex][OD<SUP>−</SUP>]) for the deuterium exchange of α-methylene or α-methine protons in the amino carboxylato complexes, <I>trans</I>(<I>O</I>)-, C<SUB>1</SUB>-<I>cis</I>(<I>O</I>)-, and C<SUB>2</SUB>-<I>cis</I>(<I>O</I>)-[Co(gly)<SUB>2</SUB>(en)]<SUP>+</SUP> and -[Co(gly)<SUB>2</SUB>(tn)]<SUP>+</SUP>, [Co(gly)(NH<SUB>3</SUB>)<SUB>4</SUB>]<SUP>2+</SUP>, [Co(gly)(en)<SUB>2</SUB>]<SUP>2+</SUP>, [Co(gly)(tn)<SUB>2</SUB>]<SUP>2+</SUP>, [Co(sar)(en)<SUB>2</SUB>]<SUP>2+</SUP>, and Λ- and <I>Δ</I>-[Co(L-ala)(en)<SUB>2</SUB>]<SUP>2+</SUP>, were determined by the <SUP>1</SUP>H-NMR measurement. The major factors determining the deuteration rate of α-hydrogens in the amino carboxylate chelate are the geometry and charge of the complex, and the nature of the substituent bonded to the chelate ring to be deuterated; the minor factor is the chelate-ring size of the ligands other than amino carboxylate in a complex molecule.

• 公益社団法人 日本化学会の論文

著者

• Kanekiyo Makoto

  Department of Chemistry, Faculty of Science, Kochi University

関連論文

• Metal complexes of amino acids. XII. The deuteration of .ALPHA.-hydrogen atoms in cobalt(III) complexes containing .ALPHA.-amino carboxylates.
• Metal complexes of peptides. I. The cobalt(III) complexes containing dipeptidate and n-methyliminodiacetate as mixed ligands.

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