The complexation processes between fullerenes (C60 and C70) and p-tert-butylcalix[n]arenes with n=6 and 8 are investigated using a chromatographic method in which the fullerenes are surface-linked to HPLC silica microparticles. Thermodynamic parameters for complex formation are extracted from variable temperature chromatography in two different solvent systems. Associations are always enthalpy driven and entropy opposed, with the larger p-tert-butylcalix[8]arene forming the tightest complex. Enthalpy and entropy changes for the complexation of calix[n]arenes with C60 and C70 immobilized on silica microparticles are extracted from variable temperature HPLC. Full-size image
Molecular recognition of p-tert-butylcalixarenes by surface linked fullerenes C60 and C70 / Gasparrini, Francesco; Misiti, Domenico; F. DELLA NEGRA, M. MAGGINI; G., Scorrano; Villani, Claudio. - In: TETRAHEDRON. - ISSN 0040-4020. - STAMPA. - 57:(2001), pp. 6997-7002. [10.1016/S0040-4020(01)00614-7]
Molecular recognition of p-tert-butylcalixarenes by surface linked fullerenes C60 and C70
GASPARRINI, Francesco;MISITI, Domenico;VILLANI, Claudio
2001
Abstract
The complexation processes between fullerenes (C60 and C70) and p-tert-butylcalix[n]arenes with n=6 and 8 are investigated using a chromatographic method in which the fullerenes are surface-linked to HPLC silica microparticles. Thermodynamic parameters for complex formation are extracted from variable temperature chromatography in two different solvent systems. Associations are always enthalpy driven and entropy opposed, with the larger p-tert-butylcalix[8]arene forming the tightest complex. Enthalpy and entropy changes for the complexation of calix[n]arenes with C60 and C70 immobilized on silica microparticles are extracted from variable temperature HPLC. Full-size imageI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
