“…To get further insights into the photoisomerization of Aber670 in the UiO-68 pores, the vibrational infrared reflection-absorption (IRRA) spectra were recorded before and after irradiation by UV and green light (Figure ). The IRRA spectra show characteristic peaks of −C–O, O–C–O, and −CO stretching vibrations at 924 cm –1 , 1226 cm –1 , and 1755–1818 cm –1 , respectively (Figure b), indicating the presence of Aber670 inside the MOF. , The reference IR spectra of pure Aber670 are shown in the Supporting Information, Figure S2. Upon UV irradiation, significant changes of the intensities of the peaks in correlation with fulgide in the MOF pores were observed; in particular, the intensities of the peaks at 924 cm –1 , 1226 cm –1 , and 1755–1818 cm –1 decrease (see Figure b).…”