Photoinduced electron transfer in a hexaphenylbenzene-based self-assembled porphyrin-fullerene triad

YUICHI TERAZONO, GERDENIS KODIS, PAUL A. LIDDELL, VIKAS GARG, MIGUEL GERVALDO, THOMAS A. MOORE,ANA L. MOORE AND DEVENS GUST

PHOTOCHEMISTRY AND PHOTOBIOLOGY

American Chemical Society

Lugar: Columbus, OH, USA.; Año: 2007 vol. 83 p. 464 - 469

0031-8655

A hexaphenylbenzene-based zinc porphyrin dyad forms a 1:1 complex with a fullerene bearing two pyridyl groups via coordination of the pyridyl nitrogens with the zinc atoms.  The fullerene is sym. located between the two zinc porphyrins.  The binding const. for the complex is 7.3 x 104 M-1 in 1,2-difluorobenzene.  Photoinduced electron transfer from a porphyrin first excited singlet state to the fullerene occurs with a time const. of 3 ps, and the resulting charge-sepd. state has a lifetime of 230 ps.  This self-assembled construct should form a basis for the construction of more elaborate model photosynthetic antenna-reaction center systems.