Enhancement of Electrochromic Switching Properties with Tröger's Base‐Derived Intrinsic Microporous Polyamide Films

The formation of Tröger's Base (TB) configuration is a useful approach to synthesize polymers of intrinsic microporosity (PIM). Herein, the V‐shaped TB scaffold is incorporated to prepare electrochromic (EC) polyamide with electroactive triphenylamine (TPA) moiety. The presence of intrinsic microporosity derived from inefficient packing of TB scaffolds can facilitate the counterions diffusion between electroactive species and electrolytes. Consequently, the resulting TB‐based polyamide exhibits enhanced EC behaviors, such as a lower driving potential, reduced the difference of redox potentials ΔE, and shorter switching response time compared to the corresponding EC counterpart polyamide. The incorporation of rigid and contorted Tröger's Base scaffolds can restrain polymer chains from close packing and further form intrinsic microporosity in the polymer matrix. With the existence of intrinsic microporosity, the diffusion rate of counterions between the electroactive polymer film and electrolyte can be promoted to reduce the oxidation potential and shorten the switching response time.