Successively Controlling Nanoscale Wrinkles of Ultrathin 2D Metal‐Organic Framework Nanosheets

Angewandte Chemie International Edition, Год журнала: 2024, Номер unknown

Опубликована: Июль 27, 2024

The wrinkles are pervasive in ultrathin two-dimensional (2D) materials, but the regulation of is rarely explored systematically. Here, we employed a series carboxylic acids (from formic acid to octanoic acid) control Zr-BTB (BTB=1, 3, 5-(4-carboxylphenyl)-benzene) metal-organic framework (MOF) nanosheet. at micrometer scale were observed with transmission electron microscopy. Furthermore, high-angle annular dark-field (HAADF) images showed lattice distortion many nanoscale regions, which was precisely matched nano-wrinkles. With changes hydrophilicity/hydrophobicity, MOF-MOF and MOF-solvent interactions possibly synergistically regulated different sizes obtained, supported by HAADF, molecular dynamics, density functional theory calculation. Different wrinkle resulted pore between nanosheet interlayers, providing highly-oriented thin films successive optimization kinetic diffusion pathways, proved grazing-incidence wide-angle X-ray scattering nitrogen adsorption. most suitable from Zr-BTB-C

Язык: Английский

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Angstrom-Level Tuning in Confined Space of Metal–Organic Framework for Ultra-High Resolution in Gas Chromatographic Separation

ACS Applied Materials & Interfaces, Год журнала: 2024, Номер unknown

Опубликована: Окт. 3, 2024

Optimizing the balance between thermodynamic interaction and kinetic diffusion is pivotal to obtaining high-performance gas chromatographic stationary phases. Here, three aluminum-based metal-organic frameworks featuring

Язык: Английский

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Successively Controlling Nanoscale Wrinkles of Ultrathin 2D Metal‐Organic Framework Nanosheets

Angewandte Chemie, Год журнала: 2024, Номер 136(42)

Опубликована: Июль 27, 2024

Abstract The wrinkles are pervasive in ultrathin two‐dimensional (2D) materials, but the regulation of is rarely explored systematically. Here, we employed a series carboxylic acids (from formic acid to octanoic acid) control Zr‐BTB (BTB=1, 3, 5‐(4‐carboxylphenyl)‐benzene) metal–organic framework (MOF) nanosheet. at micrometer scale were observed with transmission electron microscopy. Furthermore, high‐angle annular dark‐field (HAADF) images showed lattice distortion many nanoscale regions, which was precisely matched nano‐wrinkles. With changes hydrophilicity/hydrophobicity, MOF‐MOF and MOF‐solvent interactions possibly synergistically regulated different sizes obtained, supported by HAADF, molecular dynamics, density functional theory calculation. Different wrinkle resulted pore between nanosheet interlayers, providing highly‐oriented thin films successive optimization kinetic diffusion pathways, proved grazing‐incidence wide‐angle X‐ray scattering nitrogen adsorption. most suitable from Zr‐BTB‐C 4 exhibited highly efficient chromatographic separation substituted benzene isomers. Our work provides rational route for modulation their stacked pores MOF nanosheets improves abilities MOFs.

Язык: Английский

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Diradicals as Topological Charge Carriers in Metal–Organic Toy Model Pt₃(HIB)₂

Journal of the American Chemical Society, Год журнала: 2024, Номер 146(43), С. 29599 - 29608

Опубликована: Окт. 17, 2024

We explore the eclipsed stacking of a metal–organic Kagome lattice containing heavy-metal nodes. Our model is Pt3(HIB)2, hypothetical but viable member well-known family hexaaminobenzene based frameworks (MOFs). Applying space group theory, it shown how molecular diradicals, brought into play by noninnocent ligand, become topologically nontrivial bands when moving in periodic potential. Three factors are required to enable this: (1) stacking, which shifts Fermi level near symmetry-protected band crossing (2) emergence an electride-like that renders topological Z2 invariant equal 1, thus nontrivial, and (3) Pt-induced spin–orbit coupling, turn bulk gap. The electride band, with its unforeseen role, bears kinship interlayer hexagonal superconductors. It places charge density voids crystal, rather than around atomic nuclei, we name "pore band". While synthesis truly conductive MOFs has proven challenging, analysis shows intrinsically nonlocal physics may emerge from tunable building blocks. With richness redox-active MOF chemistry, this offers pathway tailored electronics.

Язык: Английский

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π-d conjugated coordination mediated catalysis for four-electron-transfer fast-charging aqueous zinc-iodine batteries

Matter, Год журнала: 2024, Номер 8(3), С. 101932 - 101932

Опубликована: Дек. 17, 2024

Язык: Английский

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Atomically resolved imaging of radiation-sensitive metal-organic frameworks via electron ptychography

Research Square (Research Square), Год журнала: 2024, Номер unknown

Опубликована: Июнь 13, 2024

Electron ptychography, recognized as an ideal technique for low-dose imaging, consistently achieves deep sub-angstrom resolution in low-dimensional materials at electron doses of several thousand electrons per square angstrom (e^-/Ų). Despite its proven efficacy, the application ptychography even lower doses—necessary highly sensitive to beams—raises questions regarding feasibility and attainable under such stringent conditions. Herein, we demonstrate successful implementation reconstruction unprecedentedly low dose ~100 e^-/Ų, metal-organic frameworks (MOFs), which are known their extreme sensitivity. The reconstructed images, achieving a ~2 Å, clearly resolve organic linkers, metal clusters, atomic columns within these while unravelling various local structural features MOFs, including missing extra surface termination modes. By combining findings from simulations experiments, have identified that employing small convergence semi-angle during data acquisition is crucial effective iterative ptychographic This important insight advances our understanding rapidly evolving provides novel approach high-resolution imaging materials.

Язык: Английский

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An Introduction to Solid-state NMR and Potential Applications for MOFs and COFs

Royal Society of Chemistry eBooks, Год журнала: 2024, Номер unknown, С. 1 - 34

Опубликована: Дек. 18, 2024

Metal–organic frameworks (MOFs) and covalent-organic (COFs) are materials typically featuring ordered long-range structures permanent porosities, which have many promising potential applications. Solid state nuclear magnetic resonance (SSNMR) provides rich molecular-level information that is exceptionally useful for the structural characterization of MOFs COFs. In this chapter, we summarize history COFs, provide a general background NMR concepts describe some typical SSNMR experimental approaches. The three primary types obtainable from COFs using spectroscopy then detailed, chapter concludes with an outline key points presented in remainder book.

Язык: Английский

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