ISSN:
1573-1111
Keywords:
inclusion complex, β-cyclodextrin
;
trisulfonated triphenylphosphine
;
NMR spectroscopy
;
electrospray mass spectroscopy
;
UV-vis spectroscopy
;
molecular modelling
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract The formation of inclusion complexesbetween the sodium salt of trisulfonatedtriphenylphosphine and β-cyclodextrin has beeninvestigated at two temperatures by high field nuclearmagnetic resonance, electrospray mass and UV-visspectroscopies. At 268 K, titration experiments andJob's method suggest that the major species insolution is a 1 : 1 inclusion complex. The moleculargeometry of this inclusion complex was studied usingthe ROESY NMR technique complemented by molecularmodelling. All these methods converged towards thestructure attained by inserting one aromatic ring intothe hydrophobic cavity of the host from the side ofthe secondary hydroxyls. At 298 K, a higher proportionof 2 : 1 and 3 : 1 complexes induces strong alterations ofthe NMR signals, preventing an easy and reliabledetermination of association constants. Nevertheless,an apparent association constant can be determinedfrom UV-vis data by assuming a 1 : 1 equilibrium. Thegeometry of the 2 : 1 and 3 : 1 complexes is also brieflydiscussed from ROESY NMR experiments.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1008165110579
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