It is both an [18]trannulene and a [60]fullerene. It is aromatic and a hexa-substituted benzene. It is formed by the first proven example of an SN 2' reaction in a fullerene. It is intensely colored and stable. It is C60 F15 [CBr(CO2 Et)2 ]3 , the first example of a new class of fullerene derivatives (see Schlegel diagram).
Fluorinated Fullerenes: Sources of Donor−Acceptor Dyads with [18]Trannulene Acceptors for Energy- and Electron-Transfer Reactions
作者:Dirk M. Guldi、Massimo Marcaccio、Francesco Paolucci、Demis Paolucci、Jeff Ramey、Roger Taylor、Glenn A. Burley
DOI:10.1021/jp053295h
日期:2005.11.1
Fine-tuned control over the donor strength in a series of trannulenes-based donor-acceptor ensembles is used to alter the deactivation path of the photoexcited-state chromophore and to modulate the rates of intramolecular electron transfer. For the first time, a detailed analysis of emission spectra, time-dependent spectroscopic measurements, and electrochemistry prove spectroscopically and kinetically that trannulenes can serve, in a manner similar to C-60 and C-60 monoadducts, as both electron and also as energy acceptor in donor-acceptor ensembles, producing widely different electron-transfer regimes. This investigation also shows that the integration of trannulenes, as a versatile electron-acceptor building block, consistently produces charge recombination in the inverted Marcus region.