Bimetallic metal–organic frameworks and their derivatives

Chen, Liyu; Wang, Haofan; Li, Caixia; Xu, Qiang

doi:10.1039/d0sc01432j

Cited by 354 publications

(199 citation statements)

References 365 publications

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“…The rational structural design is another critical issue in the domain of MOFs. Among the multitudinous factors that can affect the self‐assembly procedure for MOFs, the selection of organic ligand and metal center show undoubtedly the two most decisive effects [26] . Given the strong coordination capability, diverse coordination modes, easy modification, polycarboxylate ligands have been proved to be the most popular linkers for the MOFs construction [27] .…”

Section: Introductionmentioning

confidence: 99%

A New Fluorescence MOF for Highly Sensitive Detection of Acetylacetone

Wang

Chang

et al. 2021

ChemistrySelect

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A novel metal‐organic framework (MOF) assembled by a semi‐rigid tricarboxylate, namely, 5‐(3,4‐dicarboxylphenoxy) nicotic acid (H3L) has been solvothermally synthesized: [Zn3(L)2(H2O)2] ⋅ 3H2O 1. Single‐crystal X‐ray diffraction analysis indicates that MOF 1 shows 2‐D layer with quadrangle channels along the a axis (ca. 7.0×8.3 Å2). The 2‐D layer self‐assembles into a final 3‐D supramolecular network via the interlayer π⋯π interactions. The photoluminescence investigations indicate that 1 can selectively and sensitively detect acetylacetone (acac) with high KSV value of 3.597×104 M−1 and low limit of detection (LOD) of 50.77 ppb. Further mechanism studies have shown that static photo‐competitive absorption, photoinduced electron transfer and H‐bonding interaction between chemosensor and the analyte may be the primary causes of the fluorescence quenching effect for acac.

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Section: Introductionmentioning

confidence: 99%

A New Fluorescence MOF for Highly Sensitive Detection of Acetylacetone

Wang

Chang

et al. 2021

ChemistrySelect

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“… 3 , 75 Solid-solution chemistry—termed “multivariate” synthesis in the MOF field—offers a surprisingly underexplored additional dimension for exploration in molecular framework materials design. 76 Here the scope is especially broad, since substitution of molecular components can involve varying not only size or charge but also shape, conformation, rigidity, or functionality.…”

Section: Future Directionsmentioning

confidence: 99%

Hybrid Perovskites, Metal–Organic Frameworks, and Beyond: Unconventional Degrees of Freedom in Molecular Frameworks

Boström

Goodwin

2021

Acc. Chem. Res.

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Conspectus The structural degrees of freedom of a solid material are the various distortions most straightforwardly activated by external stimuli such as temperature, pressure, or adsorption. One of the most successful design strategies in materials chemistry involves controlling these individual distortions to produce useful collective functional responses. In a ferroelectric such as lead titanate, for example, the key degree of freedom involves asymmetric displacements of Pb 2+ and Ti 4+ cations; it is by coupling these together that the system as a whole interacts with external electric fields. Collective rotations of the polyhedral units in oxide ceramics are another commonly exploited distortion, driving anomalous behavior such as negative thermal expansion—the counterintuitive phenomenon of volume contraction on heating. An exciting development in the field has been to take advantage of the interplay between different distortion types: generating polarization by combining two different polyhedral rotations, for example. In this way, degrees of freedom act as geometric “elements” that can themselves be combined to engineer materials with new and interesting properties. Just as the discovery of new chemical elements quite obviously diversified chemical space, we might expect that identifying new and different types of structural degrees of freedom to be an important strategy for developing new kinds of functional materials. In this context, the broad family of molecular frameworks is emerging as an extraordinarily fertile source of new and unanticipated distortion types, the vast majority of which have no parallel in the established families of conventional solid-state chemistry. Framework materials are solids whose structures are assembled from two fundamental components: nodes and linkers. Quite simply, linkers join the nodes together to form scaffolding-like networks that extend from the atomic to the macroscopic scale. These structures usually contain cavities, which can also accommodate additional ions for charge balance. In the well-established systems—such as lead titanate—node, linker, and extra-framework ions are all individual atoms (Ti, O, and Pb, respectively). But in molecular frameworks, at least one of these components is a molecule. In this Account, we survey the unconventional degrees of freedom introduced through the simple act of replacing atoms by molecules. Our motivation is to understand the role these new distortions play (or might be expected to play) in different materials properties. The various degrees of freedom themselves—unconventional rotational, translational, orientational, and conformational states—are summarized and described in the context of relevant experimental examples. The much-improved prospect for generating emergent functionalities by combining these new distortion types is then discussed. We highlight a number of directions for future research—including th...

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“…Different types/different ratios of metal elements can play a role in inducing electron redistribution, 83,84 preventing sintering and agglomeration of the metal nanoparticles, to achieve the purpose of reducing the reaction overpotential and improving the catalytic activity. 14,31,[85][86][87] In addition, the introduction of multi-metal active centers can overcome the limitation that single metal active sites cannot obtain excellent bifunctional (ORR and OER) activity at the same time. 35,[88][89][90][91] Furthermore, the synergy between different metals or their interaction with other heteroatoms can further increase the activity of the catalysts.…”

Section: Multimetallic Catalystsmentioning

confidence: 99%