Fig. 6. UV/vis absorption spectra of (a) E-P1 thin film upon 300 nm irradiation and (c) Z-P1 thin film upon 405 nm irradiation. Z and E isomer ratios determined from 1H NMR spectra in the photoisomerization of (b) E-P1 and (d) Z-P1 thin films. Summary of Z and E isomer ratios determined from 1H NMR spectra at (e) 300 nm and (f) 405 nm PSSs in THF solution and in the glassy state of P1, P2, and P3.
