Isomer recognition by dynamic guest-adaptive ligand rotation in a metal–organic framework with local flexibility

Abstract

Local flexibility in a metal-organic framework is intriguing for reconstructing the microenvironment to distinguish different guest molecules by emphasizing their differences. Herein, the guest-adaptive flexibility is observed in a metal-organic...

Host–Host Interactions Enhanced the Structural Rigidity in a 6-Fold Interpenetrated Diamondoid Metal–Organic Framework Exhibiting C2H2/C2H4 Separation

“…The parameters of solvent-free NBU-X1 at 298 K closely resemble those of methanol-exchanged NBU-X1 (varying by 0.26–0.79%) and as-synthesized NBU-X1 (varying by 0.17–1.19%) and are nearly identical to rehydrated NBU-X1 (0.40–2.29%) and solvent-free NBU-X1 at 373 K (0–1.83%), with minor deviations in individual parameters (Figure b and Table S4). Anthracene-based ligands within interpenetrated MOFs commonly exhibit rotation or torsion during the process of guest molecule displacement/removal, − while such reorientations are markedly restricted in NBU-X1 . The angular displacement of the anthracene plane relative to the planes of pyridine (θ1) or carboxybenzene (θ2) was quantitatively analyzed (Figure c).…”

A Highly Stable Microporous Calcium-Based MOF for C2H2/CO2 Separation with Low Regenerative Energy

“…Furthermore, the presence of weak interactions between the plentiful π-conjugated planes of anthracene systems and guest molecules facilitates the process of gas separation. 48 NKM-123 possesses a layered configuration that remains stable in typical organic solvents as well as in aqueous solutions with pH ranging between 3 and 13. Appropriate pore size and unique anthracene-decorated channels endow NKM-123 with the ability to effectively separate CO 2 /C 2 H 2 .…”

“…By introducing anthracene-based ligands to adjust the pore size of the MOF, micropore NKM-123 ensures that the material has a low regeneration energy for C 2 H 2 separation. Furthermore, the presence of weak interactions between the plentiful π-conjugated planes of anthracene systems and guest molecules facilitates the process of gas separation . NKM-123 possesses a layered configuration that remains stable in typical organic solvents as well as in aqueous solutions with pH ranging between 3 and 13.…”