Chaolu Eerdun, Satoshi Hisanaga and Prof. Jun-ichiro Setsune Single Helicates of Dipalladium(II) Hexapyrroles: Helicity Induction and Redox Tuning of Chiroptical Properties Angewandte Chemie International Edition 52
Hexapyrrole-α,ω-dialdehyde, which has eight donor atoms, afforded a dipalladium(II) single helicate (see picture; Pd pink, O red, N blue). A rapid interchange of the helical screw was slowed down by imine formation at the terminal aldehyde units with (R)-(−)-1-cyclohexylethylamine, leading to an overwhelming excess of a P-helical screw. This stable dinuclear single helicate has a redox-driven reversible change in chiroptical properties.
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