Photo-induced Energy Transfer in a T-h-Symmetrical Hexakis-adduct of C-60 Substituted with pi-Conjugated Oligomers

A stilbene derivative bearing a terminal alkyne unit has been prepared and grafted onto a T-h-symmetrical C-60 hexakis-adduct building block under alkyne/azide copper mediated Huisgen 1,3-dipolar cycloaddition conditions. The photophysical properties of the resulting fullerene derivative surrounded by 12 conjugated oligomers have been investigated. Upon excitation of the peripheral chromophores, an efficient intramolecular energy transfer to the C-60 core has been evidenced.