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

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Copyright © 2016, The Author(s)

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Amount of trans azobenzene (black triangles) and cis azobenzene (red spheres) of the Cu₂(AzoBPDC)₂(AzoBiPyB) SURMOF. (a) The sample is initially in the (100%) trans state and is irradiated with 365 nm. (b) The sample is initially in the cis state (that is, 63% cis) and is irradiated with 455 nm. The insets show the infrared trans azobenzene peak at 720 cm⁻¹ during the irradiation with 365 and 455 nm, respectively. (c) The sample is simultaneously irradiated with light of 365 and 455 nm. The irradiation time of each point is 30 min, resulting in a photostationary state. The ratio of cis azobenzene, determined from the infrared peak at 720 cm⁻¹, is shown as a function of intensity of 365 nm relative to the total light intensity (365 and 455 nm). The light intensities are (roughly) adjusted by the potentiometers of the LEDs.