The formation of host-guest complexes between C(60) and polybenzyl ether dendrimers with different central cores (phloroglucinol, meso-tetraphenylporphyrin, cyclotriveratrylene) has been investigated in organic solvents by means of (13)C-NMR and UV-Vis spectroscopy. The interior of the dendrimers with a phloroglucinol core provides the correctly sized space for the inclusion of fullerene and (13)C-NMR studies suggest that the guest resides near the central core. In the dendrimers containing a meso-tetraphenylporphyrin (TPP) core, the absorbance of the porphyrin Soret band is substantially reduced in the presence of fullerene, thus providing evidence for close vicinity of the fullerene guest to the central core. In solution, the cyclotriveratrylene (CTV) unit alone is a poor receptor for fullerene, but its functionalization with polybenzyl ether dendrons affords an internal cavity with a more appropriate shape and dimension, thus allowing complexation. Indeed, the K(a) values (order of magnitude 101-102 L mol-1) increase significantly with the generation number of the surrounding dendritic substituents.
All Science Journal Classification (ASJC) codes
- Materials Chemistry