Complexation of Higher Fullerenes by Calixarene-Based Host Molecules
The binding abilities of calixarene-based host molecules for higher fullerenes (C76, C78, and C84) were investigated in organic solvents. The binding abilities of double-calixarenes to higher fullerenes are high. In particular, their association constants to C76 and C78 in toluene reached at the order of 105 M−1. In contrast, the binding abilities of simple calixarenes decreased as increasing the size of the fullerenes. Accordingly, linking two calixarenes with the covalent bonds creates the large cavities, complementary to higher fullerenes. The structure of the host-guest complex of double-calixarene 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 calixarene.
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Document Type: Research Article
Publication date: April 1, 2007
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