Figure 3.

Level two photoresponsive materials. a) Aza‐diarylethene 9 as photoinitiator for radical polymerization of MA. b) Irradiation of two samples with 365 nm light for 2 h 40 min (or with 365 nm + 450 nm light for 1 h 5 min). The left sample vial contains 0.72 mg of open 9 in 1 mL MA, and the right sample vial contains solely 1 mL MA. After the specified irradiation duration, the sample containing compound 9 shows the characteristic color of the closed Z‐9 isomer and is polymerized. The sample containing solely MA did not polymerize. After storing both samples for 14 h in the dark at 23 °C, a post‐curing effect happened to the compound 9 carrying sample. The sample containing solely MA did not show any changes.