Reversible Transformation of a One-Handed Helical
Foldamer Utilizing a Planarity-Switchable Spacer and <i>C</i><sub>2</sub>‑Chiral Spirobifluorene Units
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Abstract
Polymeric quaterthiophenes containing
optically active <i>C</i><sub>2</sub>-chiral spirobifluorene
skeletons were synthesized
as a new type of helical foldamers, and their higher-order structures
were investigated. Oxidization of quaterthiophene moieties caused
the spacer units to be in planar structure, leading the conformation
of the polymer to be a coil-shaped, rigid helix. This transformation
was reversibly performed