Efficient photoinduced electron transfer in a rigid U-shaped tetrad bearing terminal porphyrin and viologen units
KA Jolliffe, TDM Bell, KP Ghiggino, SJ Langford, MN Paddon-Row
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | WILEY-V C H VERLAG GMBH | Published : 1998
Apparently solvent-mediated and not through-bond photoinduced electron transfer (ET) takes place from the porphyrin (P) unit to the methylviologen (MV2+ ) unit in the rigid U-shaped molecules 1 (i.e., kTSET >kTBET ; TS=through-solvent, TB=through-bond). The ratio of the rates of charge separation to charge recombination is greater than 1400:1.