1,4,5,8-Tetramethoxyanthracene

Supramolecular Structures for Photochemical Energy Conversion

“…During the last grant period, we synthesized molecular tetrad 5, which consists of a porphyrin (P) covalently linked to a naphthoquinone (NQ) that in turn bears two benzoquinone moieties (BQ), and investigated its photochemistry using time-resolved spectroscopic techniques. 2,3 Excitation of the porphyrin chromophore of the P-NQ-BQ 2 tetrad in benzonitrile solution is followed by photoinduced electron transfer with a rate constant of 8.3 × 10 BQ) charge-separated state, which decays to the ground state with a rate constant of 1.9 × 10 10 s -1 . The tetrad features both sequential multistep electron transfer pathways, which lead to a long-lived charge-separated state, and parallel multistep electron transfer pathways, which increase the yield of the long-lived state.…”