13C-N.M.R. spectra of cyclomalto-oligosaccharides (cyclodextrins), their derivatives, and complexes with azo dyes

The nature of the inclusion complexes of several cyclomalto-oligosaccharides (cyclodextrins, CDs) with azo dyes has been studied on the basis of 13C-n.m.r. chemical shifts, relaxation times, correlation times, and broadening and doubling of the n.m.r. signals. All CDs show the azo dye-induced shifts...

Full description

Saved in:
Bibliographic Details
Published inCarbohydrate research Vol. 201; no. 1; p. 1
Main Authors Suzuki, M, Takai, H, Szejtli, J, Fenyvesi, E
Format Journal Article
LanguageEnglish
Published Netherlands 15.06.1990
Subjects
Azo Compounds
Carbohydrate Sequence
Carbon Isotopes
Cyclodextrins
Magnetic Resonance Spectroscopy
Molecular Sequence Data
Online AccessGet more information

Cover

More Information
Summary:The nature of the inclusion complexes of several cyclomalto-oligosaccharides (cyclodextrins, CDs) with azo dyes has been studied on the basis of 13C-n.m.r. chemical shifts, relaxation times, correlation times, and broadening and doubling of the n.m.r. signals. All CDs show the azo dye-induced shifts at the narrow-rim side of the CD, indicating that the azo dyes protrude from the cavity. CD-induced shifts of azo dyes depend on the hydrophobic nature of the cavity, van der Waals forces, as well as ring-current and deformation effects, and suggest inclusion essentially from the hydrophobic site. The broadening and the doubling of the 13C-n.m.r. signals, the altered relaxation and correlation times, as well as the temperature dependence for these phenomena, also provide particular information about the characteristic host-guest interactions.
ISSN:0008-6215
DOI:10.1016/0008-6215(90)84221-F