Figure 4.

Ceasing SPP photoreactivity using a PAG. A) UV/Vis absorbance of the MeO‐PEG‐SPP in water before and after irradiation with blue light at λ=445 nm. B) UV/Vis absorbance of the MeO‐PEG‐SPP and spiropyran‐based PAG in water before and after irradiation with blue light at λ=445 nm. C) ¹H NMR spectra (600 MHz, CDCl₃) of MeO‐PEG‐SPP before (top spectrum) and after irradiation by green light at 525 nm with PAG, blue light at λ=445 nm, and blue light at λ=445 nm with PAG (bottom spectrum, irradiation conditions: I=3 W cm⁻², t=1 h); the highlighted area indicates the resonances from styryl CH=CH protons.