Complexation of higher fullerenes by calix[5]arene-based host molecules
| Autor: | Chigusa Fukunaga, Yoshimasa Fukazawa, Takeharu Haino |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Materials science
Fullerene Magnetic Resonance Spectroscopy Macromolecular Substances Biomedical Engineering Chemistry Organic Molecular Conformation Bioengineering Medicinal chemistry chemistry.chemical_compound Molecule Nanotechnology General Materials Science Temperature Stereoisomerism General Chemistry Condensed Matter Physics Toluene Carbon Higher fullerenes Kinetics chemistry Models Chemical Covalent bond Spectrophotometry Solvents Fullerenes Calixarenes |
| Zdroj: | Journal of nanoscience and nanotechnology. 7(4-5) |
| ISSN: | 1533-4880 |
| Popis: | The binding abilities of calix[5]arene-based host molecules for higher fullerenes (C76, C78, and C84) were investigated in organic solvents. The binding abilities of double-calix[5]arenes to higher fullerenes are high. In particular, their association constants to C76 and C78 in toluene reached at the order of 10(5) M(-1). In contrast, the binding abilities of simple calix[5]arenes decreased as increasing the size of the fullerenes. Accordingly, linking two calix[5]arenes with the covalent bonds creates the large cavities, complementary to higher fullerenes. The structure of the host-guest complex of double-calix[5]arene and C76 was discussed. The carbons of the polar end of C76 characteristically shifted upfield more than the other carbons in the host-guest complex, indicating that these polar carbons reside most deeply inside the cavity of the calix[5]arene. |
| Databáze: | OpenAIRE |
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