Fig. 6: Guest species in MOFs.

a, b HAADF-STEM image and schematic illustration of perovskite CsPbI3 quantum dots confined in MIL-101 (adapted with permission from ref. 90. © 2019 American Chemical Society). c HR-TEM and d HAADF-STEM images of single-molecular magnet, Mn12Ac, isolated by the porous matrix of NU-1000. White arrows indicated the encapsulated Mn12Ac clusters selectively residing in the hexagonal channels. The insets show the schematic illustration and the enlarged images of the highlighted square areas (adapted with permission from ref. 34. © 2019 American Chemical Society). e Cryo-TEM image and simulated structure of ZIF-8 with adsorbed CO2 molecules. The arrow indicates the adsorbed CO2 molecule (adapted with permission from ref. 91. © 2019 Elsevier).