Fig. 7. Photoisomerization studies of a MOF with integrated spiropyran and hydrazone derivatives.
a Combined diffuse reflectance spectra of as-synthesized UiO-67 + 2 + 5 upon exposure to a 365-nm excitation wavelength. Changes in the profile corresponding to MC-to-SP photoisomerization of 2 are shown in orange. The spectra were collected by irradiating the sample with λex = 365 nm for 30 s followed by attenuation under visible light (λex = 400–900 nm). The spectral changes corresponding to E-to-Z photoisomerization of the hydrazone derivative 5 are shown in green, and the spectra were collected under continuous UV irradiation (λex = 365 nm). b Kinetics studies of 5 photoisomerization in UiO-67 + 2 + 5 as-synthesized (squares) and after evacuation (triangles). Fittings are given in light and dark green, respectively. c Kinetics studies of 2 photoisomerization in UiO-67 + 2 + 5 as-synthesized (squares) and after evacuation (triangles). Fittings are given in light and dark orange, respectively.