The highly soluble fullerene-pentacene monoadducts 2 a and 2 b were synthesized by a Diels-Alder reaction between fullerene and pentacene derivatives. The single-crystal X-ray diffraction analysis of 2 a revealed an attractive intermolecular interaction between fullerene moiety of one molecule and the pentacene arms of an adjacent molecule, resulting in the formation of head-to-tail dimers in solution. This self-association behavior of 2 a and 2 b was also observed by 1H NMR and fluorescence spectroscopy in chloroform. Both the excitation and emission wavelengths can be modulated via the concentration of 2 a and 2 b.
- Host-guest systems
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