In the presence of poly(ethylene glycol) (PEG), α-cyclodextrin forms a molecular adduct called “molecular necklace” that belongs to the class of polyrotaxanes. The condensation of α-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 PEG3350, 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 α-cyclodextrin, the molecular necklace, and the molecular tube. The results show that the molecular tube is really formed by a linear thread of condensed α-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 (I3-) in aqueous solution.

Molecular Dynamics of Novel alpha-Cyclodextrin Adducts Studied by 13C-NMR Relaxation / P. LO NOSTRO; CECCATO M.; ROSSI C.; BAGLIONI P.. - In: JOURNAL OF PHYSICAL CHEMISTRY. B, CONDENSED MATTER, MATERIALS, SURFACES, INTERFACES & BIOPHYSICAL. - ISSN 1520-6106. - STAMPA. - 101:(1997), pp. 5094-5099. [10.1021/jp9638447]

Molecular Dynamics of Novel alpha-Cyclodextrin Adducts Studied by 13C-NMR Relaxation

LO NOSTRO, PIERANDREA;BAGLIONI, PIERO
1997

Abstract

In the presence of poly(ethylene glycol) (PEG), α-cyclodextrin forms a molecular adduct called “molecular necklace” that belongs to the class of polyrotaxanes. The condensation of α-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 PEG3350, 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 α-cyclodextrin, the molecular necklace, and the molecular tube. The results show that the molecular tube is really formed by a linear thread of condensed α-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 (I3-) in aqueous solution.
1997
101
5094
5099
P. LO NOSTRO; CECCATO M.; ROSSI C.; BAGLIONI P.
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/212992
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