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. 2023 Nov 20;14:7556. doi: 10.1038/s41467-023-43405-w

Fig. 4. Modes of photoswitch connectivity within MOF matrices.

Fig. 4

a (top) X-ray crystal structure of Zn2(12)(DBTD) and a 3D photochromic MOF structure consisting of 2D layers of H4DBTD linkers (gray rectangle) connected by zinc paddlewheel metal nodes (orange spheres). Photoswitches (orange rod) are integrated as pillars between 2D layers. (bottom) X-ray crystal structure of Zr6O4(OH)4(BPDC)6 (UiO-67) with a possible mode of photoswitch incorporation highlighted in orange and a 3D photochromic UiO-67 MOF in which photoresponsive linkers (orange) are integrated through coordination to unsaturated zirconium nodes (see Supplementary Fig. 63 for additional views of the UiO-67 structure). b Building blocks for the preparation of the studied photochromic MOFs.