Molecular Recognition by a Silica-Bound Fullerene Derivative
摘要:
Thermal ring opening of N-[3-(triethoxysilyl)propyl]-2-carbomethoxyaziridine in the presence of C-60 produces a fulleropyrrolidine derivative which is then attached covalently to HPLC silica gel. The new chromatographic material is used to investigate binding affinities of potential hosts for the immobilized C-60. Exceptionally high size selectivities have been obtained for cyclic oligomeric compounds like calixarenes and cyclodextrins in organic and water-rich media, respectively. A number of rationally designed, helical-shaped peptides bind selectively to the grafted fullerene. The mast tightly bound peptide carries two ferrocene moieties at the periphery of a hydrophobic binding cavity complementary in size to C-60.
Molecular Recognition by a Silica-Bound Fullerene Derivative
摘要:
Thermal ring opening of N-[3-(triethoxysilyl)propyl]-2-carbomethoxyaziridine in the presence of C-60 produces a fulleropyrrolidine derivative which is then attached covalently to HPLC silica gel. The new chromatographic material is used to investigate binding affinities of potential hosts for the immobilized C-60. Exceptionally high size selectivities have been obtained for cyclic oligomeric compounds like calixarenes and cyclodextrins in organic and water-rich media, respectively. A number of rationally designed, helical-shaped peptides bind selectively to the grafted fullerene. The mast tightly bound peptide carries two ferrocene moieties at the periphery of a hydrophobic binding cavity complementary in size to C-60.
Thermal ring opening of N-[3-(triethoxysilyl)propyl]-2-carbomethoxyaziridine in the presence of C-60 produces a fulleropyrrolidine derivative which is then attached covalently to HPLC silica gel. The new chromatographic material is used to investigate binding affinities of potential hosts for the immobilized C-60. Exceptionally high size selectivities have been obtained for cyclic oligomeric compounds like calixarenes and cyclodextrins in organic and water-rich media, respectively. A number of rationally designed, helical-shaped peptides bind selectively to the grafted fullerene. The mast tightly bound peptide carries two ferrocene moieties at the periphery of a hydrophobic binding cavity complementary in size to C-60.
Molecular recognition of p - tert -butylcalixarenes by surface-linked fullerenes C 60 and C 70
作者:F Gasparrini、D Misiti、F Della Negra、M Maggini、G Scorrano、C Villani
DOI:10.1016/s0040-4020(01)00614-7
日期:2001.8
The complexation processes between fullerenes (C-60 and C-70) 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. (C) 2001 Elsevier Science Ltd. All rights reserved.