Bis-4-aza[6]helicene: a bis-helicenic 2,2'-bipyridine with chemically-triggered chiroptical switching activity

2019 
A novel enantiopure bis-helicenic 2,2'-bipyridine system was prepared using a Negishi coupling. Thanks to the bipyridine unit, the coordination with ZnII and protonation processes were studied revealing efficient tuning of photophysical (UV/Visible and emission) and chiroptical properties (electronic circular dichroism and circularly polarized emission) of the system. The coordination/decoordination and protonation/deprotonation processes appeared reversible thus constituting novel chiroptical switches.
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