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. 2016 Dec 20;7:13872. doi: 10.1038/ncomms13872

Figure 2. Photoswitchable SURMOFs of type Cu2(AzoBPDC)2(AzoBiPyB).

Figure 2

(a) The structure of Cu2(AzoBPDC)2(AzoBiPyB) with the azobenzene groups in the (basic) trans state, left, and in the cis state, right. The photoisomerization from trans to cis is performed by irradiation with ultraviolet-light of 365 nm, while the cis-to-trans isomerization is performed by irradiation with blue light of 455 nm. (Different view points of the MOF structure are shown in Supplementary Fig. 3.) (b) Infrared spectra of the Cu2(AzoBPDC)2(AzoBiPyB) SURMOF in the pristine trans state (black), after ultraviolet irradiation with light of 365 nm (red) and after irradiation with visible light of 455 nm (blue). The inset shows the magnification of the trans and cis azobenzene bands at about 720 and 730 cm−1, respectively. An infrared spectrum with a larger range is shown in Supplementary Fig. 4. (c) Out-of-plane X-ray diffractogram of Cu2(AzoBPDC)2(AzoBiPyB) SURMOF before (black) and after (red) ultraviolet irradiation.