Abstract
| Lingua originale | English |
|---|---|
| pagine (da-a) | 2573-2578 |
| Rivista | Default journal |
| Volume | 111 |
| Stato di pubblicazione | Published - 2007 |
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All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry
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Complexation of phosphine ligands with peracetylated β-cyclodextrin in supercritical carbon dioxide: spectroscopic determination of equilibrium constants. / Filardo, Giuseppe; Scialdone, Onofrio; Galia, Alessandro; Tilloy, Sebastien; Monflier, Eric; Ferreira, Michel; Navarre, Edward Charles.
In: Default journal, Vol. 111, 2007, pag. 2573-2578.Risultato della ricerca: Article
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TY - JOUR
T1 - Complexation of phosphine ligands with peracetylated β-cyclodextrin in supercritical carbon dioxide: spectroscopic determination of equilibrium constants
AU - Filardo, Giuseppe
AU - Scialdone, Onofrio
AU - Galia, Alessandro
AU - Tilloy, Sebastien
AU - Monflier, Eric
AU - Ferreira, Michel
AU - Navarre, Edward Charles
PY - 2007
Y1 - 2007
N2 - The interaction between peracetylated beta-cyclodextrin and several triphenyl phosphine derivatives was studied in supercritical carbon dioxide (scCO2) by UV-visible spectroscopy. The equilibrium constant for a 1:1 complexation reaction was obtained from titration spectra and calculated using two established mathematical models. The values of the equilibrium constants are 1-3 orders of magnitude smaller than those obtained inaqueous solution with analogous phosphines. This is likely due to the absence in scCO2 of the hydrophobic effect, which is replaced by a corresponding, but weaker, CO2-phobic effect. The largest value of Kf wasfound for complexes of diphenyl(4-adamantylphenyl)phosphine, which is rationalized on the basis of theexcellent fit of the phosphine in the cyclodextrin cavity, leading to enhanced host-guest van der Waals interactions. This study can be considered the first step toward the comprehension of the complexationthermodynamics of modified cyclodextrins soluble in scCO2.
AB - The interaction between peracetylated beta-cyclodextrin and several triphenyl phosphine derivatives was studied in supercritical carbon dioxide (scCO2) by UV-visible spectroscopy. The equilibrium constant for a 1:1 complexation reaction was obtained from titration spectra and calculated using two established mathematical models. The values of the equilibrium constants are 1-3 orders of magnitude smaller than those obtained inaqueous solution with analogous phosphines. This is likely due to the absence in scCO2 of the hydrophobic effect, which is replaced by a corresponding, but weaker, CO2-phobic effect. The largest value of Kf wasfound for complexes of diphenyl(4-adamantylphenyl)phosphine, which is rationalized on the basis of theexcellent fit of the phosphine in the cyclodextrin cavity, leading to enhanced host-guest van der Waals interactions. This study can be considered the first step toward the comprehension of the complexationthermodynamics of modified cyclodextrins soluble in scCO2.
UR - http://hdl.handle.net/10447/7927
M3 - Article
VL - 111
SP - 2573
EP - 2578
JO - Default journal
JF - Default journal
ER -