Synthetic Approaches to a Variety of Covalently Linked Porphyrin−Fullerene Hybrids
作者:Shaun MacMahon、Robert Fong、Phil S. Baran、Igor Safonov、Stephen R. Wilson、David I. Schuster
DOI:10.1021/jo010317x
日期:2001.8.1
There is substantial interest in dyads in which C-60 is covalently linked to electron donors, such as porphyrins, which absorb light strongly in the visible region. We present here the details of the syntheses of such compounds, which can be broadly organized into categories depending upon the nature of the linker joining the two chromophores. The structural aspects of intramolecular electronic interaction that we have sought to explore have dictated the synthetic strategies employed to generate these classes of molecules. Flexible glycol linkers were used to allow close approach between the fullerene and porphyrin, facilitating through-space interactions. These linkers also allowed studies of the effects of metal cation complexation. Naphthalene and alkyne linkers were used to examine the possible effects a conjugated or aromatic linker might have on photophysical properties. Finally, steroids were used as linkers in dyads expected to possess a large distance between the two chromophores, in which only through-bond interactions between the fullerene and porphyrin should be possible.
Synthesis and photophysics of porphyrin–fullerene donor–acceptor dyads with conformationally flexible linkers
作者:David I. Schuster、Shaun MacMahon、Dirk M. Guldi、Luis Echegoyen、Silvia E. Braslavsky
DOI:10.1016/j.tet.2005.07.127
日期:2006.2
ET to give CSRP states followed by exergonic charge recombination to eventually generate fullerene triplets. Such a mechanism has been demonstrated experimentally for structurally related P–C60 dyads. For the corresponding ZnP–C60 dyads with flexible linkers, only photoinduced ET to generate long-lived CSRP states is observed. Photoinduced chargeseparation in these dyad systems is extremely rapid, consistent