title: Characterization of the complex formation of 1,6-anhydro-β-maltose and potassium ions using NMR spectroscopy and single-crystal X-ray crystallography.
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.
authors.affiliation: Department of Chemistry, Meisei University, Hodokubo, Hino, Tokyo Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Fujimoto
authors.forename: Takayuki
authors.initials: T
authors.lastname: Kato
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Usui
authors.forename: Osamu
authors.initials: O
authors.lastname: Kamo
authors.forename: Kazuo
authors.initials: K
authors.lastname: Furihata
authors.forename: Koji
authors.initials: K
authors.lastname: Tsubono
authors.forename: Toshiyo
authors.initials: T
authors.lastname: Kato
authors.forename: Tomoya
authors.initials: T
authors.lastname: Machinami
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Tashiro
mesh_terms: D018360:Crystallography, X-Ray / Q000379:methods*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008320:Maltose / Q000031:analogs & derivatives* / Q000737:chemistry; D008958:Models, Molecular; D011188:Potassium / Q000737:chemistry*
chemical_list: C506931:1,6-anhydro-beta-maltose; D008320:Maltose; D011188:Potassium