Photoinduced electron transfer in a hexaphenylbenzene-based self-assembled porphyrin-fullerene triad.
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 symmetrically located between the two zinc porphyrins. The binding constant for the complex is 7.3 x 10(4) M(-1) in 1,2-difluorobenzene. Photoinduced electron transfer from a porphyrin first excited singlet state to the fullerene occurs with a time constant of 3 ps, and the resulting charge-separated 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.
Terazono
Yuichi
Y
Department of Chemistry and Biochemistry, Center for the Study of Early Events in Photosynthesis, Arizona State University, Tempe, AZ, USA.
Kodis
Gerdenis
G
Liddell
Paul A
PA
Garg
Vikas
V
Gervaldo
Miguel
M
Moore
Thomas A
TA
Moore
Ana L
AL
Gust
Devens
D