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(A) The mechanism for intramolecular singlet fission for bridged pentacene dimers. (B–D): Potential outcomes when leveraging two triplets from singlet fission for (B) a doubly oxidative quenching cycle, (C) a doubly reductive quenching cycle (2e redox events), (D) double energy transfer (EnT) cycle, (E) a consecutive ET-EnT cycle (the analogous process where the EnT precedes the ET step can also be envisioned).
