Time-resolved fluorescence further reveals a clear trend in excited-state lifetimes ( Fig. 2b ): [8]HBI-1 (8.8 ns) < [8]HBI-2 (10.4 ns) < [8]HBI-3 (14.7 ns).
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Through-bond <i>versus</i> through-space conjugation and high-dissymmetry chiroptical switching in proton-responsive [8]helicene bisbenzimidazoles.
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