Figure 1.

(a) Isomerization of azobenzene: the E → Z isomerization can be controlled through irradiation of the π–π* transition at a wavelength of ∼320 nm, Z → E isomerization can be controlled by irradiation of the n−π* transition at a wavelength ∼450 nm, or through heating; (b) Representation of the different methods to integrate a photoresponsive moiety (shown in light purple) into a porous material: (i) loading with a photoactive guest; (ii) decorating with photoresponsive groups; (iii) incorporation of photoresponsive groups into the scaffold itself to either introduce a gating mechanism or induce a change in size and/or shape.