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The first examples of chiral helical viologens are reported. These novel compounds have sufficiently long singlet lifetimes to support bimolecular photochemical reactions. They are quenched with diffusion-controlled rates with dialkyl-, diaryl-, and alkyl-aryl sulfides presumably by a charge transfer/electron transfer mechanism.
We thank the National Science Foundation (CHE-1147542) for their generous support of this research.
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