Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12779/4222
Title: Molecular Dynamics of Novel a-Cyclodextrin Adducts Studied by 13C-NMR Relaxation
Authors: Ceccato, M
LO NOSTRO, P
Rossi, Claudio 
Bonechi, Claudia 
Donati, Alessandro 
Baglioni, P.
Issue Date: 1997
Project: None 
Journal: JOURNAL OF PHYSICAL CHEMISTRY. B, CONDENSED MATTER, MATERIALS, SURFACES, INTERFACES & BIOPHYSICAL
Abstract: 
In the presence of poly(ethylene glycol) (PEG), cyclodextrin forms a molecular adduct called “molecular necklace” that belongs to the class of polyrotaxanes. The condensation of cyclodextrin with epichlorohydrin results in the formation of the so-called “molecular tube” (MT), a rodlike rigid molecule with an empty hydrophobic cavity that can behave as a host for ions or small organic molecules. MT has been obtained from PEG, considerably longer than the chain used in previous works. This paper reports an NMR investigation of the dynamic properties, via carbon spin-lattice relaxation technique, of cyclodextrin, the molecular necklace, and the molecular tube. The results show that the molecular tube is really formed by a linear thread of condensed R-cyclodextrin molecules and that MT possesses a faster reorientational motion than all the other compounds. UV spectroscopy shows that the molecular tube forms a host-guest system with iodine in aqueous solution.
Description: 
36858
URI: http://hdl.handle.net/20.500.12779/4222
ISSN: 1520-6106
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