atmosphere resulted in the formation of quinone-linked porphyrins in good yields. This photochemical method was successfully appliedto the synthesis of a series of perpendicularly, coplanarly, andorthogonally quinone-capped porphyrins bridged with different number of methylene chains. On the basis of the analysis of fluorescence lifetimes of these quinone-capped porphyrins, it could be concluded that the intramolecular