Novel azo-Metal–Organic Framework Showing a 10-Connected bct Net, Breathing Behavior, and Unique Photoswitching Behavior toward CO2

Herein, we report a robust azo-metal–organic framework (MOF), namely, ECUT-15, which can be described as a 10-connected bct net built on trinuclear Co3 subunits. The activated samples of it perform a somewhat breathing behavior. Most importantly, under UV irradiation, this MOF performs outstanding photoswitching behavior toward CO2, giving great variation in the CO2 capture/release performance, for example, 45% under static conditions and 75% under dynamic measurements, as well as instantaneous release of up to 78%.