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A simple trinitro cobalt complex [Co(3,3′-diamino-N-methylpropanediamine)(NO2)3] was proven to be photoswitchable at room temperature as the Pca21 polymorph with the maximum nitro-to-nitrito conversion reaching ca. 55%. Solid-state IR, UV-vis and XRD indicate that the transformation can be triggered optically in both ways via 470 nm and 570–660 nm LED light, respectively.

Graphical abstract: An optically reversible room-temperature solid-state cobalt(iii) photoswitch based on nitro-to-nitrito linkage isomerism

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