Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 13, Issue 23, Pages 6755-6760Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200700339
Keywords
calixarenes; fullerenes; host-guest systems; nanostructures; supramolecular chemistry
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Mixing solutions of p-tBucalix[5]arene and C-60 in toluene results in a 1:1 complex (C-60)boolean AND(p-tBu-calix[5]arene), which precipitates as nanofibers. The principle structural unit is based on a host-guest ball-and-socket nanostructure of the two components, with an extended structure comprising zigzag/helical arrays of fullerenes (powder X-ray diffraction data coupled with molecular modeling). Under argon at temperatures above 309 degrees C, the fibers undergo selective volatilization of the calixarenes to afford C-60-core nanostructures encapsulated in a graphitic material sheath, which exhibits a dramatic increase in surface area. Above 650 degrees C the material exhibits an ohmic conductance response, due to the encapsulation process.
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