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Research on Advanced Two-Dimensional Lamellar Metal-Organic Frameworks

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Materials Chemistry".

Deadline for manuscript submissions: closed (15 August 2023) | Viewed by 2456

Special Issue Editor

Materials Science and Engineering, School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ 85287, USA
Interests: two-dimensional materials; quantum materials; organic framework films; epitaxy growth; nanostructure synthesis

Special Issue Information

Dear Colleagues,

Two-dimensional (2D) lamellar metal–organic frameworks (LMOFs), in which their layers are bound loosely while the in-plane binding force is relatively stronger are attracting intense attention. Their attractions are not only arising from the combined merits of 2D materials and porous metal–organic frameworks, but also the unique properties 2D LMOFs possess. Among those, the highly accessible active sites, unique electron/phonon transition path, and possibility of large-scale fabrication promote 2D LMOFs to occupy irreplaceable positions in gas separation, catalytic application, sensing devices, and others. Numerous research has been dedicated to the synthesis and manufacturing of metal–organic framework layers. Especially, the interlayer force, crystallinity, pore/channel dimension, specific ligands involved, and others, are expected to achieve a better understanding of 2D LMOFs structures and more precise control over their chemical/physical properties. Moreover, as a sub-cetology of 2D materials, LMOFs open up a new opportunity to build organic/inorganic or organic/organic heterostructures with periodic patterns.

In this Special Issue, we welcome original research, progress review, or comments, with insights on 2D LMOFs synthesis, structural analysis, property exploration, superlattice build-up, as well as, a wide range of application directions, including but not limited to, seawater desalination, chemical product separation, biosensor, optoelectronic device, catalysis, and capacitor.

Dr. Yuxia Shen
Guest Editor

Manuscript Submission Information

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • 2D LMOFs
  • Layers
  • porous structure
  • large-scale fabrication
  • separation
  • catalysis

Published Papers (2 papers)

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Research

13 pages, 2763 KiB  
Article
Fluorescent and Catalytic Properties of a 2D Lamellar Zn Metal–Organic Framework with sql Network Structure
by Chaewon Shin, Jongseo Kim and Seong Huh
Molecules 2023, 28(17), 6357; https://doi.org/10.3390/molecules28176357 - 30 Aug 2023
Viewed by 1125
Abstract
A two-dimensional (2D) lamellar Zn metal–organic framework (Zn-MOF, 1) with a fluorescent 1,6-di(pyridin-3-yl)pyrene (3-DPPy) and 1,4-benzenedicarboxylate (BDC2−) bridging linkers was prepared and structurally characterized. The chemical formula of 1 is [Zn(μ-3-DPPy)(μ-BDC)]n. The mononuclear Zn(II) ion, acting as a [...] Read more.
A two-dimensional (2D) lamellar Zn metal–organic framework (Zn-MOF, 1) with a fluorescent 1,6-di(pyridin-3-yl)pyrene (3-DPPy) and 1,4-benzenedicarboxylate (BDC2−) bridging linkers was prepared and structurally characterized. The chemical formula of 1 is [Zn(μ-3-DPPy)(μ-BDC)]n. The mononuclear Zn(II) ion, acting as a node, is tetrahedrally coordinated with two 3-DPPy and two BDC linkers. The coordination environment of Zn(II) is a distorted tetrahedral geometry. The Zn-MOF is the sql network structure based on topology analysis. The undulated 2D sheets of 1 tightly pack together to form a lamellar structure. The pyrene moieties are parallelly oriented to each other. The Zn-MOF is not porous, possibly because the mononuclear Zn(II) node did not form cluster-based secondary building units due to the less symmetric 3-DPPy. The steady-state fluorescence measurements indicate that the fluorescence signal of the 1 is slightly blue-shifted compared to the free 3-DPPy in the solid state. The excimer emission band at 463 nm for crystalline 3-DPPy is shifted to 447 nm for 1. The value of 447 nm is also a blue-shift value compared to nonsubstituted pyrene crystals (470 nm). Despite its nonporosity, the surface Lewis acidic sites of 1 could catalyze the transesterification of esters. Surface defect sites are responsible for this catalytic activity. Full article
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14 pages, 3037 KiB  
Article
A Lamellar Zn-Based Coordination Polymer Showing Increasing Photoluminescence upon Dehydration
by Oier Pajuelo-Corral, Jose Angel García, Oscar Castillo, Antonio Luque, Claudio Mendicute-Fierro, Antonio Rodríguez-Diéguez and Javier Cepeda
Molecules 2023, 28(15), 5643; https://doi.org/10.3390/molecules28155643 - 25 Jul 2023
Cited by 2 | Viewed by 1044
Abstract
The present study reports on a 2D lamellar coordination polymer (CP) of {[Zn(µ3-pmdc)(H2O)]·H2O}n formula (pmdc = pyrimidine-4,6-dicarboxylate). This CP is synthesized under an appropriate acid-base reaction between the gently mortared reagents in the solid state through [...] Read more.
The present study reports on a 2D lamellar coordination polymer (CP) of {[Zn(µ3-pmdc)(H2O)]·H2O}n formula (pmdc = pyrimidine-4,6-dicarboxylate). This CP is synthesized under an appropriate acid-base reaction between the gently mortared reagents in the solid state through a solvent-free procedure that avoids the presence of concomitant byproducts. The X-ray crystal structure reveals the occurrence of Zn2 entities connected through carboxylate groups of pmdc, which behave as triconnected nodes, giving rise to six-membered ring-based layers that are piled up through hydrogen bonding interactions. In addition to a routine physico-chemical characterization, the thermal evolution of the compound has been studied by combining thermogravimetric and thermodiffractometric data. The photoluminescence properties are characterized in the solid state and the processes governing the spectra are described using time-dependent density-functional theory (TD-DFT) with two different approaches employing different program packages. The emissive capacity of the material is further analyzed according to the dehydration and decreasing temperature of the polycrystalline sample. Full article
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