Molecular magnetism in nanodomains of isoreticular MIL-88(Fe)-MOFs

Dawood, Sheeba; Shaji, Surabhi; Pathiraja, Gayani; Mo, Yirong; Rathnayake, Hemali

doi:10.1039/d1cp03122h

Cited by 13 publications

(2 citation statements)

References 66 publications

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“…The broad stretching band can be seen at ≈3300 cm −1 , which indicates the presence of surface water molecules. [14,15] The X-ray photoelectron spectroscopy (XPS) survey spectra revealed the existence of C, O, and Fe elements on the surface (Figure 1i). There are two main peaks observed at 711.4 and 725.1 eV in the high-resolution spectra of Fe 2p, which correspond to Fe 2p 3/2 and Fe 2p 1/2 , respectively, while the peak at 718.2 eV indicates satellite peak feature of Fe III in MIL-88(Fe) MOF (Figure S1a, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Photoactive and Intrinsically Fuel Sensing Metal–Organic Framework Motors for Tailoring Collective Behaviors of Active‐Passive Colloids

Ikram

Peng

Hassan

et al. 2023

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Microorganisms display nonequilibrium predator–prey behaviors, such as chasing–escaping and schooling via chemotactic interactions. Even though artificial systems have revealed such biomimetic behaviors, switching between them by control over chemotactic interactions is rare. Here, a spindle‐like iron‐based metal–organic framework (MOF) colloidal motor which self‐propels in glucose and H2O2, triggered by UV light is reported. These motors display intrinsic UV light‐triggered fuel‐dependent chemotactic interactions, which are used to tailor the collective dynamics of active‐passive colloidal mixtures. In particular, the mixtures of active MOF motors with passive colloids exhibit distinctive “chasing–escaping” or “schooling” behaviors, depending on glucose or hydrogen peroxide being used as the fuel. The transition in the collective behaviors is attributed to an alteration in the sign of ionic diffusiophoretic interactions, resulting from a change in the ionic clouds produced. This study offers a new strategy on tuning the communication between active and passive colloids, which holds substantial potentials for fundamental research in active matter and practical applications in cargo delivery, chemical sensing, and particle segregation.

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Section: Resultsmentioning

confidence: 99%

Photoactive and Intrinsically Fuel Sensing Metal–Organic Framework Motors for Tailoring Collective Behaviors of Active‐Passive Colloids

Ikram

Peng

Hassan

et al. 2023

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“…In addition, a satellite peak at 715 eV was observed, which belongs to the Fe 2+ (Figure 1H). [ 18 ] Compared with those in MIL‐88B‐Fe, the Fe 2p 3/2 and Fe 2p 1/2 peaks in the MIL‐88B‐Fe/Zn spectrum shifted to higher binding energies, indicating that the incorporation of Zn can regulate the electron density of the Fe center. [ 16 ]…”

Section: Resultsmentioning

confidence: 99%

Engineering Platelet Membrane‐Coated Bimetallic MOFs as Biodegradable Nanozymes for Efficient Antibacterial Therapy

Shi,

Zhao,

Liu

et al. 2023

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Nanocatalytic‐based wound therapeutics present a promising strategy for generating reactive oxygen species (ROS) to antipathogen to promote wound healing. However, the full clinical potential of these nanocatalysts is limited by their low reactivity, limited targeting ability, and poor biodegradability in the wound microenvironment. Herein, a bio‐organic nanozyme is developed by encapsulating a FeZn‐based bimetallic organic framework (MOF) (MIL‐88B‐Fe/Zn) in platelet membranes (PM@MIL‐88B‐Fe/Zn) for antimicrobial activity during wound healing. The introduction of Zn in MIL‐88B‐Fe/Zn modulates the electronic structure of Fe thus accelerating the catalytic kinetics of its peroxidase‐like activity to catalytically generate powerful ROS. The platelet membrane coating of MOF innovatively enhanced the interaction between nanoparticles and the biological environment, further developing bacterial‐targeted therapy with excellent antibacterial activity against both gram‐positive and gram‐negative bacteria. Furthermore, this nanozyme markedly suppressed the levels of inflammatory cytokines and promoted angiogenesis in vivo to effectively treat skin surface wounds and accelerate wound healing. PM@MIL‐88B‐Fe/Zn exhibited superior biodegradability, favourable metabolism and non‐toxic accumulation, eliminating concerns regarding side effects from long‐term exposure. The high catalytic reactivity, excellent targeting features, and biodegradability of these nanoenzymes developed in this study provide useful insights into the design and synthesis of nanocatalysts/nanozymes for practical biomedical applications.

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Coordination Flexibility Aided CO₂‐specific Gating in an Iron Isonicotinate MOF

Singh

Nandi

Chakraborty

et al. 2022

Chemistry An Asian Journal

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Coordination flexibility assisted porosity has been introduced into an Iron‐isonicotinate metal‐organic framework (MOF), (Fe(4‐PyC)2 ⋅ (OH). The framework showed CO2‐specific gate opening behavior, which gets tuned as a function of temperature and pressure. The MOF′s physisorptive porosity towards CO2, CH4, and N2 was investigated; it adsorbed only CO2 via a gate opening phenomenon. The isonicotinate, representing a borderline soft base, is bound to the hard Fe3+ centre through monodentate carboxylate and pyridyl nitrogen. This moderately weak binding enables isonicotinate to spin like a spindle under the CO2 pressure opening the gate for a sharp increase in CO2 uptake at 333 mmHg (At 298 K, the CO2 uptake increases from 0.70 to 1.57 mmol/g). We investigated the MOF′s potential for CO2/N2 and CO2/CH4 gas separation aided by this gating. IAST model reveals that the CO2/N2 selectivity jumps from 325 to 3131 when the gate opens, while the CO2/CH4 selectivity increases three times. Interestingly, this Fe‐isonicotinate MOF did not follow the trend set by our earlier reported Hard‐Soft Gate Control (established for isostructural M2+‐isonicotinate MOFs (M=Mg, Mn)). However, we account for this discrepancy using the different oxidation state of metals confirmed by X‐ray photoelectron spectroscopy and magnetism.

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Molecular magnetism in nanodomains of isoreticular MIL-88(Fe)-MOFs

Abstract: The molecular-based magnetism in nanodomains of three isoreticular MIL-88(Fe) analogues is studied and reported. Microstructures of isoreticular extended frameworks of MIL-88B, MIL-88C, and interpenetrated analogue of MIL-88D, i.e., MIL-126, with...

Cited by 13 publications

References 66 publications

Photoactive and Intrinsically Fuel Sensing Metal–Organic Framework Motors for Tailoring Collective Behaviors of Active‐Passive Colloids

Photoactive and Intrinsically Fuel Sensing Metal–Organic Framework Motors for Tailoring Collective Behaviors of Active‐Passive Colloids

Engineering Platelet Membrane‐Coated Bimetallic MOFs as Biodegradable Nanozymes for Efficient Antibacterial Therapy

Coordination Flexibility Aided CO₂‐specific Gating in an Iron Isonicotinate MOF

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Molecular magnetism in nanodomains of isoreticular MIL-88(Fe)-MOFs

Abstract: The molecular-based magnetism in nanodomains of three isoreticular MIL-88(Fe) analogues is studied and reported. Microstructures of isoreticular extended frameworks of MIL-88B, MIL-88C, and interpenetrated analogue of MIL-88D, i.e., MIL-126, with...

Cited by 13 publications

References 66 publications

Photoactive and Intrinsically Fuel Sensing Metal–Organic Framework Motors for Tailoring Collective Behaviors of Active‐Passive Colloids

Photoactive and Intrinsically Fuel Sensing Metal–Organic Framework Motors for Tailoring Collective Behaviors of Active‐Passive Colloids

Engineering Platelet Membrane‐Coated Bimetallic MOFs as Biodegradable Nanozymes for Efficient Antibacterial Therapy

Coordination Flexibility Aided CO2‐specific Gating in an Iron Isonicotinate MOF

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Coordination Flexibility Aided CO₂‐specific Gating in an Iron Isonicotinate MOF