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Titolo:
Binding of inorganic and organic cations by p-sulfonatocalix[4]arene in water: a thermodynamic study
Autore:
Bonal, C; Israeli, Y; Morel, JP; Morel-Desrosiers, N;
Indirizzi:
Univ Blaise Pascal, Lab Thermodynam Solut & Polymeres, UMR 6003, CNRS, F-63177 Aubiere, France Univ Blaise Pascal Aubiere France F-63177 CNRS, F-63177 Aubiere, France
Titolo Testata:
JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2
fascicolo: 7, , anno: 2001,
pagine: 1075 - 1078
SICI:
1472-779X(2001):7<1075:BOIAOC>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
TRIVALENT LANTHANIDE CATIONS; SOLUBLE CALIXARENES; AQUEOUS-SOLUTION; ASSOCIATION CONSTANTS; NMR DETERMINATION; SULFONATE GROUPS; HYDROXYL-GROUPS; GIBBS ENERGIES; COMPLEXATION; IONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Bonal, C Univ Blaise Pascal, Lab Thermodynam Solut & Polymeres, UMR 6003, CNRS, 24 Ave Landais, F-63177 Aubiere, France Univ Blaise Pascal 24 Ave Landais Aubiere France F-63177 France
Citazione:
C. Bonal et al., "Binding of inorganic and organic cations by p-sulfonatocalix[4]arene in water: a thermodynamic study", J CHEM S P2, (7), 2001, pp. 1075-1078

Abstract

We report a microcalorimetry study of the association of various inorganicand organic cations with p-sulfonatocalix[4]arene at 298.15 K. First, we have studied the electrostatic attraction between host 1 and seven rare-earth-metal cations representative of the whole lanthanide series (La3+, Nd3+, Sm3+, Eu3+, Gd3+, Dy3+ and Yb3+) in an acidic solution (pH 2). In order to compare the charge effects in the electrostatic interactions we have also studied the attraction between host 1 and two alkaline-earth-metal cations (Ca2+ and Mg2+). Next, we investigated the binding of a series of quaternaryammonium cations in an acidic solution (pH 2). For each system, both the apparent association constant and enthalpy of complexation have been extracted from the calorimetric data. In all cases, our results are consistent with the formation of 1:1 complexes. Whereas for the inorganic cations (alkaline-earth-metal and lanthanide cations) the association process is enthalpically unfavoured (Delta H-r degrees >0) and entropically favoured (Delta S-rdegrees >0), the complexation is driven by a favourable enthalpy change for the organic cations. These thermodynamic properties show that the organicand inorganic cations bind in very different modes.

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Documento generato il 12/12/19 alle ore 15:05:43