Fig. 4: Shape-dependent MOF superlattice assemblies.
From: Colloidal crystal engineering with metal–organic framework nanoparticles and DNA
a Crystal structure and bright field (BF) STEM image of an octahedral UiO-66 NP formed by Zr6 SBUs and terephthalic acid ligands. b A model of a bcc lattice formed with face-to-face oriented UiO-66 PAEs, as such arrangement maximizes DNA hybridization interactions. c Cryo-STEM BF images show that octahedral-shaped UiO-66 PAEs with self-complementary DNA linkers assemble into bcc lattices. d Crystal structure and BF STEM image of a single PCN-222 nanorod formed by the connection of Zr6 SBUs and tetrakis(4-carboxyphenyl)porphyrin linkers (box). e Schematic representation of PCN-222 PAEs assembled into two different lattices depending on DNA link design: nanorods functionalized with self-complementary DNA linkers (purple) form a 2D hexagonal superlattice (left), and complementary DNA linkers (red and blue rods) assemble into a 2D tetragonal superlattice (right). f 1D SAXS patterns of PCN-222 superlattices with in-plane hexagonal (purple) and tetragonal (red) symmetries. g 1D SAXS patterns of PCN-222 tetragonal superlattices with tunable interparticle spacings by changing DNA linker lengths [d40: 77 nm (crimson), d80: 92 nm (red), d120: 109 nm (pink)]. h Cryo-STEM BF images show that PCN-222 PAEs with self-complementary DNA linkers close-pack into 2D hexagonal lattices. i Cryo-STEM BF image shows that PCN-222 PAEs interconnected by complementary DNA linkers form a 2D tetragonal lattice. All scale bars are 100 nm.
