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  • Title: Characterization of the complex formation of 1,6-anhydro-β-maltose and potassium ions using NMR spectroscopy and single-crystal X-ray crystallography.
    Author: Fujimoto T, Kato T, Usui Y, Kamo O, Furihata K, Tsubono K, Kato T, Machinami T, Tashiro M.
    Journal: Carbohydr Res; 2011 Sep 27; 346(13):1991-6. PubMed ID: 21764043.
    Abstract:
    The formation of a complex between 1,6-anhydro-β-maltose and potassium ions was characterized using (1)H, (13)C and (39)K NMR spectroscopy and single-crystal X-ray crystallography. In the NMR study, the spin-lattice relaxation times (T(1)) of C1, C3, C5, C6, and C5' significantly decreased in the presence of potassium ions, and (39)K-T(1) also decreased in the presence of 1,6-anhydro-β-maltose, indicating complex formation. In a crystal, both 8- and 9-coordination structures, corresponding to the distorted capped pentagonal bipyramidal structure and the capped hexagonal bipyramidal structure, respectively, were identified. A potassium ion was positioned in the center of each bipyramidal structure.
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