Characterization of the complex formation of 1,6-anhydro-β-maltose and potassium ions using NMR spectroscopy and single-crystal X-ray crystallography

Takashi Fujimoto; Takayuki Kato; Yosuke Usui; Osamu Kamo; Kazuo Furihata; Koji Tsubono; Toshiyo Kato; Tomoya Machinami; Mitsuru Tashiro

doi:10.1016/j.carres.2011.06.017

Characterization of the complex formation of 1,6-anhydro-β-maltose and potassium ions using NMR spectroscopy and single-crystal X-ray crystallography

Carbohydr Res. 2011 Sep 27;346(13):1991-6. doi: 10.1016/j.carres.2011.06.017. Epub 2011 Jul 19.

Authors

Takashi Fujimoto¹, Takayuki Kato, Yosuke Usui, Osamu Kamo, Kazuo Furihata, Koji Tsubono, Toshiyo Kato, Tomoya Machinami, Mitsuru Tashiro

Affiliation

¹ Department of Chemistry, Meisei University, Hodokubo, Hino, Tokyo Japan.

PMID: 21764043
DOI: 10.1016/j.carres.2011.06.017

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.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Crystallography, X-Ray / methods*
Magnetic Resonance Spectroscopy / methods*
Maltose / analogs & derivatives*
Maltose / chemistry
Models, Molecular
Potassium / chemistry*

Substances

1,6-anhydro-beta-maltose
Maltose
Potassium