A simple trinitro cobalt complex [Co(3,3'-diamino--methylpropanediamine)(NO)] was proven to be photoswitchable at room temperature as the 2 polymorph with the maximum nitro-to-nitrito conversion reaching 55%. Solid-state IR, UV-vis and XRD indicate that the transformation can be triggered optically in both ways 470 nm and 570-660 nm LED light, respectively.
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