Assessing Guest-Molecule Diffusion in Heterogeneous Powder Samples of Metal-Organic Frameworks through Pulsed-Field-Gradient (PFG) NMR Spectroscopy

2017 ◽  
Vol 23 (53) ◽  
pp. 13000-13005 ◽  
Author(s):  
Roland Thoma ◽  
Jörg Kärger ◽  
Nader de Sousa Amadeu ◽  
Sandra Nießing ◽  
Christoph Janiak
Keyword(s):  
Nmr Spectroscopy ◽  
Field Gradient ◽  
Guest Molecule ◽  
Metal Organic Frameworks ◽  
Pulsed Field ◽  
Powder Samples ◽  
Metal Organic ◽  
Pfg Nmr

scholarly journals Diffusion of methyl oleate in hierarchical micro-/mesoporous TS-1-based catalysts probed by PFG NMR spectroscopy

RSC Advances ◽  
2018 ◽  
Vol 8 (68) ◽  
pp. 38941-38944 ◽  
Author(s):  
Muslim Dvoyashkin ◽  
Nicole Wilde ◽  
Jürgen Haase ◽  
Roger Gläser
Keyword(s):  
Nmr Spectroscopy ◽  
Methyl Oleate ◽  
Field Gradient ◽  
Pulsed Field Gradient Nmr ◽  
Pulsed Field ◽  
Direct Assessment ◽  
Pfg Nmr

Direct assessment of methyl oleate diffusion confined to nanopores of TS-1-based catalysts by means of pulsed field gradient NMR.

Controlling Gas Selectivity in Molecular Porous Liquids by Tuning the Cage Window Size

2019 ◽  
Author(s):  
Benjamin Egleston ◽  
Konstantin V. Luzyanin ◽  
Michael C. Brand ◽  
Rob Clowes ◽  
Michael E. Briggs ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Chemical Synthesis ◽  
Field Gradient ◽  
Window Size ◽  
Standard Approach ◽  
Porous Solids ◽  
Pulsed Field Gradient Nmr ◽  
Pulsed Field ◽  
Cage Molecules ◽  
Gas Selectivity

Control of pore window size is the standard approach for tuning gas selectivity in porous solids. Here, we present the first example where this is translated into a molecular porous liquid formed from organic cage molecules. Reduction of the cage window size by chemical synthesis switches the selectivity from Xe-selective to CH<sub>4</sub>-selective, which is understood using <sup>129</sup>Xe, <sup>1</sup>H, and pulsed-field gradient NMR spectroscopy.

Controlling Gas Selectivity in Molecular Porous Liquids by Tuning the Cage Window Size

2019 ◽  
Author(s):  
Benjamin Egleston ◽  
Konstantin V. Luzyanin ◽  
Michael C. Brand ◽  
Rob Clowes ◽  
Michael E. Briggs ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Chemical Synthesis ◽  
Field Gradient ◽  
Window Size ◽  
Standard Approach ◽  
Porous Solids ◽  
Pulsed Field Gradient Nmr ◽  
Pulsed Field ◽  
Cage Molecules ◽  
Gas Selectivity

Control of pore window size is the standard approach for tuning gas selectivity in porous solids. Here, we present the first example where this is translated into a molecular porous liquid formed from organic cage molecules. Reduction of the cage window size by chemical synthesis switches the selectivity from Xe-selective to CH<sub>4</sub>-selective, which is understood using <sup>129</sup>Xe, <sup>1</sup>H, and pulsed-field gradient NMR spectroscopy.

Pulsed Field Gradient Selection in Two-Dimensional Magic Angle Spinning NMR Spectroscopy of Dipolar Solids

1998 ◽  
Vol 134 (2) ◽  
pp. 355-359 ◽  
Author(s):  
Tilo Fritzhanns ◽  
Siegfried Hafner ◽  
Dan E. Demco ◽  
Hans W. Spiess ◽  
Frank H. Laukien
Keyword(s):  
Nmr Spectroscopy ◽  
Field Gradient ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Two Dimensional ◽  
Pulsed Field ◽  
Angle Spinning

Probing Ionic Association on Metal Oxide Clusters by Pulsed Field Gradient NMR Spectroscopy: The Example of Sn12–Oxo Clusters

2004 ◽  
Vol 10 (7) ◽  
pp. 1747-1751 ◽  
Author(s):  
François Ribot ◽  
Virginie Escax ◽  
José C. Martins ◽  
Monique Biesemans ◽  
Laurent Ghys ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Metal Oxide ◽  
Field Gradient ◽  
Ionic Association ◽  
Pulsed Field Gradient Nmr ◽  
Pulsed Field ◽  
Metal Oxide Clusters

27Al Pulsed Field Gradient, Diffusion–NMR Spectroscopy of Solvation Dynamics and Ion Pairing in Alkaline Aluminate Solutions

2018 ◽  
Vol 122 (48) ◽  
pp. 10907-10912 ◽  
Author(s):  
Trent R. Graham ◽  
Kee Sung Han ◽  
Mateusz Dembowski ◽  
Anthony J. Krzysko ◽  
Xin Zhang ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Field Gradient ◽  
Ion Pairing ◽  
Solvation Dynamics ◽  
Pulsed Field ◽  
Diffusion Nmr ◽  
Gradient Diffusion

scholarly journals Skyrmion Lattices in Chiral Metal–organic Frameworks

2020 ◽  
Author(s):  
Emma Wolpert ◽  
François-Xavier Coudert ◽  
Andrew Goodwin
Keyword(s):  
Simple Model ◽  
Data Storage ◽  
Guest Molecule ◽  
Metal Organic Frameworks ◽  
Orientational Order ◽  
Phase Behaviour ◽  
Smart Devices ◽  
Winding Number ◽  
Metal Organic ◽  
Dynamics Simulations

<p>Skyrmions are knot-like topologically-protected objects of use in data storage and low-energy smart devices. They can be generated by applying a magnetic field to certain chiral ferromagnets, with the knotted state involving a curling of the underlying magnetisation to give a nonzero winding number. Here we explore the possibility that chiral metal–organic frameworks (MOFs) might in principle host skyrmionic phases—realised not through the winding of magnetic spins but through that of guest molecule orientations. We propose a simple model for the interactions governing guest orientational order in chiral MOFs, with uniaxial strain acting as conjugate field. Using Monte Carlo simulations we show that this model gives a rich phase behaviour that includes molecular skyrmion crystals. <i>Ab initio</i> molecular dynamics simulations carried out for a candidate chiral MOF of tractable complexity demonstrate that our simple model effectively captures its underlying energetics. Our results suggest that skyrmionic states may indeed be realisable in MOFs and related porous media and may even arise spontaneously in thin-film samples.</p>

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