Structures of lanthanoid complexes of glyceric acid, gluconic acid, and lactobionic acid from the lanthanoid-induced 1H NMR shifts: pH dependence of the lanthanoid-substrate equilibria.
スポンサーリンク
概要
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Lanthanoid-induced <SUP>1</SUP>H NMR shifts of glyceric acid, gluconic acid, and lactobionic acid were observed in D<SUB>2</SUB>O. Stoichiometric analysis using the shift data at various pH values indicated that the concentration of a 1 : 1 complex between substrates and lanthanoid ions was higher than that of a 2 : 1 complex at a low pH. The structure of an axially symmetric 1 : 1 complex was obtained on the assumption of a predominant pseudo-contact interaction between a europium ion and the ligand nuclei. All the title glycosidic acids were found to chelate the cation with α-carboxy, α-hydroxy, and β-hydroxy oxygens. The relative position of β-hydroxy oxygen is particularly important for the complex formation between β-hydroxy carboxylic acids and metal ions.
- 公益社団法人 日本化学会の論文
著者
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Kuroda Yoshihiro
Faculty Of Pharmaceutical Sciences Kyoto University
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TAGA Tooru
Faculty of Pharmaceutical Sciences, Kyoto University
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Taga Tooru
Faculty Of Pharmaceutical Science Kyoto University
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Ohashi Makoto
Faculty of Pharmaceutical Sciences, Kyoto University
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