H. Imahori et al., PORPHYRIN-QUINONE SUPRAMOLECULE WITH 2 COORDINATION BONDS, Journal of the Chemical Society, Chemical Communications, (11), 1995, pp. 1133-1134
Using two coordination bonds, a porphyrin-quinone supramolecule with a
large association constant is assembled; intramolecular photoinduced
electron transfer from the excited singlet state of the porphyrin to t
he quinone is observed by steady-state fluorescence quenching and time
-resolved fluorescence studies.