ChemInform Abstract: Xenon 129 NMR: Review of Recent Insights into Porous Materials

Weiland, Erika; Springuel‐Huet, Marie‐Anne; Nossov, Andreï; Gédéon, A.

doi:10.1002/chin.201613271

Cited by 3 publications

(4 citation statements)

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“…NMR spectroscopy with thermally polarized 129 Xe has been extensively applied to the study of porous materials but the strength of hyperpolarized 129 Xe is in the detection of dynamic processes; see the reviews published on this subject. 966,1014,1015 A recent example of the study of a dynamic process is the utilization of xenon chemical shift for the observation of the temperature dynamics during the first 100 s of the start-up of a catalytic hydrogenation reaction. 1016 Another engineering application, investigating the structure-transport relationships in the hierarchical porous structure of a catalytic diesel particulate filter (DPF) monolith, illustrates the (back) translation of MRI technology from medical application to engineering sciences.…”

Section: Chemical Reviewsmentioning

confidence: 99%

Spin Hyperpolarization in Modern Magnetic Resonance

et al. 2023

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Magnetic resonance techniques are successfully utilized in a broad range of scientific disciplines and in various practical applications, with medical magnetic resonance imaging being the most widely known example. Currently, both fundamental and applied magnetic resonance are enjoying a major boost owing to the rapidly developing field of spin hyperpolarization. Hyperpolarization techniques are able to enhance signal intensities in magnetic resonance by several orders of magnitude, and thus to largely overcome its major disadvantage of relatively low sensitivity. This provides new impetus for existing applications of magnetic resonance and opens the gates to exciting new possibilities. In this review, we provide a unified picture of the many methods and techniques that fall under the umbrella term "hyperpolarization" but are currently seldom perceived as integral parts of the same field. Specifically, before delving into the individual techniques, we provide a detailed analysis of the underlying principles of spin hyperpolarization. We attempt to uncover and classify the origins of hyperpolarization, to establish its sources and the specific mechanisms that enable the flow of polarization from a source to the target spins. We then give a more detailed analysis of individual hyperpolarization techniques: the mechanisms by which they work, fundamental and technical requirements, characteristic applications, unresolved issues, and possible future directions. We are seeing a continuous growth of activity in the field of spin hyperpolarization, and we expect the field to flourish as new and improved hyperpolarization techniques are implemented. Some key areas for development are in prolonging polarization lifetimes, making hyperpolarization techniques more generally applicable to chemical/biological systems, reducing the technical and equipment requirements, and creating more efficient excitation and detection schemes. We hope this review will facilitate the sharing of knowledge between subfields within the broad topic of hyperpolarization, to help overcome existing challenges in magnetic resonance and enable novel applications.

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Section: Chemical Reviewsmentioning

confidence: 99%

Spin Hyperpolarization in Modern Magnetic Resonance

et al. 2023

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“…A 129 Xe-NMR experiment is generally useful to examine a structure and property of porous materials. 38 The NMR spectrum is measured with a commercial spectrometer (CMX300 model 300 MHz, Chemagnetics, USA). From the chemical shift, 39 we are available not only to identify Xe molecules embedded in the nanochannel, but also to determine the Xe partial pressure in a glass tube (ϕ 4 mm) made of Pyrex glass.…”

Section: Measurement Of Sample Weightmentioning

confidence: 99%

“…The time variation of proton conductivity, which rapidly drops and gradually approaches zero (σ 0 (0.1 MPa) = σ 0 (0.4 MPa) ≈ 0), is reproducible with eq 3 as well. In Figure 5a, the data is fitted by a green curve, which is a sum of the fast process (blue curve) with σ f (0.1 MPa) = 0.0027 (Ω cm) −1 and τ f Xe On behalf of verifying that Xe actually resides in the nanochannel, we have measured the chemical shift for the sample pressurized by Xe in the glass tube at 294 K. 38,42 In Figure 5e, a signal at 1.9 ppm proves that the pressure inside the tube is approximated as 0.4 MPa. 43 Furthermore, there appears a remarkable signal at 204 ppm, which is caused by Xe inside of WNT.…”

Section: Storage Of Xe In Wntmentioning

confidence: 99%

Proton Conduction Inhibited by Xe Hydrates in the Water Nanotube of the Molecular Porous Crystal {{[Ru^III(H₂bim)₃](TMA)}₂·mH₂O}_n

2019

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Gas sorption and molecular (ionic) storages are important functionalities in porous materials. In molecular porous crystal {{[RuIII(H2bim)3](TMA)}2·mH2O} n , the hydrophilic nanochannel accommodates the water nanotube (WNT) composed of a 4461074-polyhedral cage. The experiment on weight change reveals that the cage structure is maintained above 50% RH (relative humidity) at 294 K. As the relative humidity is reduced from 80 to 50% RH, the proton conductivity exponentially decreases from 0.02 to 0.01 (Ω cm)−1 owing to the dehydration of inner H2O molecules through WNT, which acts as a nanofluidic channel. Upon pressurizing Xe at 0.4 MPa for 50% RH, the proton conductivity exponentially decreases and approaches 0 (Ω cm)−1. The infrared and 129Xe-NMR experiments make clear that Xe together with about 25H2O molecules per cage are stabilized in WNT at low pressures compared to Xe-clathrate hydrate. Those results experimentally demonstrate that the Xe hydrate inhibits the proton conduction. The formation of Xe hydrate is characterized by fast and slow processes with a translational diffusion constant of 1 × 10–10 and 6 × 10–12 m2/s, respectively. The reorganization and hardening of the hydrogen-bonding water network are considered to diminish the conducting pass of proton, and to reduce the protonic transfer from H3O+ to adjacent H2O.

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“…Meanwhile, application of hyperpolarization (hp) technique can increase the signal by more than 10 4 -fold, thus allowing for very sensitive detection 1,2 . Consequently, xenon has long been used as an inert probe to determine cavity environments of porous materials and organisms such as proteins [3][4][5][6] . Promise has also been shown for xenonbased magnetic resonance imaging (MRI) 7 and target-specific biosensing when a suitable xenon-trapping host is applied [8][9][10][11][12][13] .…”

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confidence: 99%

Xenon binding by a tight yet adaptive chiral soft capsule

et al. 2020

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Xenon binding has attracted interest due to the potential for xenon separation and emerging applications in magnetic resonance imaging. Compared to their covalent counterparts, assembled hosts that are able to effectively bind xenon are rare. Here, we report a tight yet soft chiral macrocycle dimeric capsule for efficient and adaptive xenon binding in both crystal form and solution. The chiral bisurea-bisthiourea macrocycle can be easily synthesized in multi-gram scale. Through assembly, the flexible macrocycles are locked in a bowl-shaped conformation and buckled to each other, wrapping up a tight, completely sealed yet adjustable cavity suitable for xenon, with a very high affinity for an assembled host. A slow-exchange process and drastic spectral changes are observed in both 1H and 129Xe NMR. With the easy synthesis, modification and reversible characteristics, we believe the robust yet adaptive assembly system may find applications in xenon sequestration and magnetic resonance imaging-based biosensing.

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ChemInform Abstract: Xenon 129 NMR: Review of Recent Insights into Porous Materials

Cited by 3 publications

References 1 publication

Spin Hyperpolarization in Modern Magnetic Resonance

Spin Hyperpolarization in Modern Magnetic Resonance

Proton Conduction Inhibited by Xe Hydrates in the Water Nanotube of the Molecular Porous Crystal {{[Ru^III(H₂bim)₃](TMA)}₂·mH₂O}_n

Xenon binding by a tight yet adaptive chiral soft capsule

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ChemInform Abstract: Xenon 129 NMR: Review of Recent Insights into Porous Materials

Cited by 3 publications

References 1 publication

Spin Hyperpolarization in Modern Magnetic Resonance

Spin Hyperpolarization in Modern Magnetic Resonance

Proton Conduction Inhibited by Xe Hydrates in the Water Nanotube of the Molecular Porous Crystal {{[RuIII(H2bim)3](TMA)}2·mH2O}n

Xenon binding by a tight yet adaptive chiral soft capsule

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Proton Conduction Inhibited by Xe Hydrates in the Water Nanotube of the Molecular Porous Crystal {{[Ru^III(H₂bim)₃](TMA)}₂·mH₂O}_n