A solid-state 1H-NMR study of the dynamic structure of ZIF-8 and its role in the adsorption of bulky molecules

Tuning the Catalytic Performance of Novel Composites Based on ZIF‐8 and Nafen through Dimensional and Concentration Effects in the Synthesis of Propylene Glycol Methyl Ether

“…According to the investigation of solid‐state 1 H nuclear magnetic resonance ( 1 H‐NMR) spectroscopy,, CDCl 3 interacts with the six‐membered‐ring apertures of ZIF‐8. Based on potential energy analyses using van der Waals pairwise interactions, Ueda et al suggested feasible sites for the CDCl 3 adsorption in the ZIF‐8 micropores, which are located at one of the four diagonal axes of the cubic lattice of the ZIF‐8 unit cell. Intermolecular interactions between the CDCl 3 molecule and the pore wall are minimal for these sites.…”

“…According to Ueda et al, the increasing adsorption uptake of CDCl 3 leads to suppression of the molecular motions of the 2‐methylimidazolate rings due to the rising pressure on the six‐membered rings by the adsorbed molecules. Moreover, Zhang et al demonstrated that the cages of the ZIF‐8 framework at the surface of the crystal behave differently than the cages in the crystal volume in N 2 adsorption on the ZIF‐8 matrix.…”

Advancing Metal‐Organic Frameworks toward Smart Sensing: Enhanced Fluorescence by a Photonic Metal‐Organic Framework for Organic Vapor Sensing

“…[ 18 ] Many studies have predicted that ZIF‐8 can adsorb molecules with dimensions larger than its aperture size through the so‐called gate opening phenomenon. [ 45–49 ] The imidazolate linkers at the aperture swing back and forth as the adsorbate molecules approach, thereby causing a significant increase in the aperture size from 3.4 to 6.5 Å. [ 50,51 ] Figure 4b shows the adsorption isotherms of vapor molecules on NR∼ZIF‐8 powder at room temperature.…”

“…The fluorescent selectivity of the NR∼ cc ZIF‐8 film to p‐xylene over other isomers is consistent with their adsorption into ZIF‐8. [ 49 ] Webster et al [ 53 ] and Ueda et al [ 45 ] have shown that adsorbate molecules assume certain orientations in which the cross‐section area is minimum with the least activation energy for easy passage through the aperture of ZIF‐8. In the case of p‐xylene, the molecule assumes a cylindrical orientation as it enters ZIF‐8; however, the o‐ and m‐isomers have larger minimum cross‐sectional areas than the p‐xylene isomer, making their entrance into the ZIF‐8 relatively harder, and resulting in their lower fluorescent recognition.…”

Investigation of the Linker Swing Motion in the Zeolitic Imidazolate Framework ZIF-90

“…25 A correlation between computations and experimental data of the linker swing motion in ZIF-8 has been built. 29 It is reasonable to consider a fast but small-amplitude (±17° at 295 K) swing motion of the 2-mIM linkers in ZIF-8. 25,[30][31][32] The large-amplitude (80°±10°) twist of the 2-mIM linker relative to the ZIF-8 window plane was recently shown experimentally by 2H NMR and dielectric spectroscopy.…”