Coordinated Molecule-Modulated Magnetic Phase with Metamagnetism in Metal–Organic Frameworks

Son, Kwanghyo; Kim, Jin Yeong; Schütz, Gisela; Kang, Sung Gu; Moon, Hoi Ri; Oh, Hyunchul

doi:10.1021/acs.inorgchem.9b00889

Cited by 17 publications

(14 citation statements)

References 29 publications

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“…36 Rubio-Giménez et al measured temperature-and field dependence of magnetization and concluded qualitatively that Ni-MOF-74 could be described as a combination of weak FM intrachain and weaker AFM interchain interaction. 37 However, recently Son et al 38 reported that Ni-MOF-74 is described as AFM chain with J ≈ −4 cm −1 . Due to many inconsistent results, it seemed necessary to investigate in more detail the magnetic properties of this prototypical MOF.…”

Section: Introductionmentioning

confidence: 99%

Impact of dehydration and mechanical amorphization on the magnetic properties of Ni(ii)-MOF-74

et al. 2020

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Section: Introductionmentioning

confidence: 99%

Impact of dehydration and mechanical amorphization on the magnetic properties of Ni(ii)-MOF-74

et al. 2020

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“…Previous studies have revealed that the magnetism of MOFbased nanomaterials is closely related to the molecular structure of MOFs, especially the nature and arrangement of metal atoms in the MOF molecules or ions. 40,41 In the current study, we noticed that a group of Fe-MOFs (Fe-MOF-1 ∼ Fe-MOF-4) belonging to the same space group (C2/c) did not show significant differences in their magnetism under the same test conditions, although there were observable differences in their morphology. In our opinion, such a similar phenomenon of magnetic behavior may be an objective reflection of the high similarity between the internal structure of this group of Fe-MOF nanomaterials, that is, the molecular structure and atomic stacking.…”

Section: Magnetic Properties Of Fe-mof-1mentioning

confidence: 53%

“…There are many reports about the magnetic properties of MOFs, many of which point to the structural magnetic correlation. − As far as we know, only a few studies on the magnetic properties of Fe-MOFs have been reported …”

Section: Resultsmentioning

confidence: 99%

Controlled Morphological Transformation, Photocatalytic Properties, and Electrocatalytic OER Performance of Fe-MOF Nanopolyhedra

Song

Wang

et al. 2021

J. Phys. Chem. C

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In this work, we prepared a series of Fe-MOF polyhedra [metal organic framework (MOF)-1 ∼ −13] by introducing β-cyclodextrin (CD) as a morphology modifier using an interaction between ferric chloride and terephthalic acid in dimethylformamide. A novel structural evolution from a hexagonal bipyramid to a bipyramidal hexagonal prism was clearly observed. This evolution was gradual and could be well reflected by the height ratio of the prism and pyramid in these polyhedral structures. It is the relative concentration of β-CD that drives this structural evolution. Although the reaction temperature and time can also affect the height ratio to some extent, their influence can only be realized in the presence of β-CD. In the absence of β-CD, only hexagonal bipyramid structures were obtained. It is worth noting that Fe-MOF-1 with a bipyramidal hexagonal prism structure (prism height, ∼130 nm) showed typical paramagnetic characteristics, and its saturation magnetization was determined to be 23.1 emu•g −1 . Furthermore, we found that Fe-MOF-1 exhibited good photocatalytic performance for different types of dyes (crystal violet with positives and methyl orange with negative charges). At the same time, a possible photocatalytic mechanism was proposed to explain the difference of degradation efficiency between the two dyes. Also, we use the combination of specific surface area and zeta potential to explain the differences in the catalytic properties of a series of Fe-MOF materials. In addition, MOF-1 shows the same electrocatalytic oxygen evolution reaction performance as some bimetallic MOFs such as Fe-Co-MOF. For example, the overpotential of MOF-1 is 398 mV at 10 mA•cm −2 current density, while that of Fe-Co-MOF is 410 mV. We believe that the current work can contribute to the adjustment, modification, and application of MOF nanostructures.

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“…The raw M – H data, excluding the paramagnetic and diamagnetic components, exhibit nonsaturating behavior with increasing field strength; therefore, they cannot be analyzed by a simple Langevin fitting. Consequently, we used a modified Langevin fitting function with temperature-dependent susceptibility ( eq 1 ), expressed as 47 , 48 where M ( H , T ) is the measured magnetization; F Pd ( F UiO = 1 – F Pd ) is the mass fraction of the Pd NPs in the sample; χ a ( T ) is the susceptibility of the Pd core, ligands, etc. ; and M 0pd ( T ) ( M 0UiO ( T )) and μ Pdeff ( T ) (μ UiOeff ( T )) represent the magnetization (emu/g) and the effective magnetic moment (μ B ), which is the average magnetic moment of the uncompensated for spins in the particles, respectively.…”

mentioning

confidence: 99%

“…The raw M−H data, excluding the paramagnetic and diamagnetic components, exhibit nonsaturating behavior with increasing field strength; therefore, they cannot be analyzed by a simple Langevin fitting. Consequently, we used a modified Langevin fitting function with temperature-dependent susceptibility (eq 1), expressed as 47,48…”

mentioning

confidence: 99%

Hybrids of Pd Nanoparticles and Metal–Organic Frameworks for Enhanced Magnetism

Kim

Muhammad

Schuetzenduebe

et al. 2021

J. Phys. Chem. Lett.

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Nonmagnetic Pd exhibits ferromagnetism in the nanosize regime. Various stabilization agents, including surfactants, metal oxide supports, polymers, and porous materials (e.g., metal–organic frameworks (MOFs)), have been employed to prevent the agglomeration of metal nanoparticles. However, magnetic properties are greatly affected by the structural and electronic changes imposed by these stabilizing agents. In particular, metal–MOF hybrids (NPs@MOFs) have reduced magnetic properties, as reported by several authors. Herein, we report the enhancement in magnetic properties resulting from the combination of magnetic Pd NPs with UiO-66(Hf), which exhibits ferromagnetism, and the corresponding modifications in the hybridized structures. These hybridized structures are found to be strongly ferromagnetic, showing high magnetization and coercivity. We observed that the magnetic property is enhanced by 2 to 3 times upon including the Pd NPs on the surface of a UiO-66(Hf) shell support. For a fundamental understanding, the magnetization ( M – H data) of the hybridized structure is analyzed with a modified Langevin function.

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Coordinated Molecule-Modulated Magnetic Phase with Metamagnetism in Metal–Organic Frameworks

Cited by 17 publications

References 29 publications

Impact of dehydration and mechanical amorphization on the magnetic properties of Ni(ii)-MOF-74

Impact of dehydration and mechanical amorphization on the magnetic properties of Ni(ii)-MOF-74

Controlled Morphological Transformation, Photocatalytic Properties, and Electrocatalytic OER Performance of Fe-MOF Nanopolyhedra

Hybrids of Pd Nanoparticles and Metal–Organic Frameworks for Enhanced Magnetism

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