scholarly journals In Situ Monitoring of Unique Switching Transitions in the Pressure-Amplifying Flexible Framework Material DUT-49 by High-Pressure 129Xe NMR Spectroscopy

2017 ◽  
Vol 121 (9) ◽  
pp. 5195-5200 ◽  
Author(s):  
Jana Schaber ◽  
Simon Krause ◽  
Silvia Paasch ◽  
Irena Senkovska ◽  
Volodymyr Bon ◽  
...  
Keyword(s):  
High Pressure ◽  
Nmr Spectroscopy ◽  
In Situ Monitoring ◽  
129Xe Nmr ◽  
Flexible Framework

scholarly journals High-Pressure in Situ 129Xe NMR Spectroscopy: Insights into Switching Mechanisms of Flexible Metal–Organic Frameworks Isoreticular to DUT-49

2019 ◽  
Vol 31 (16) ◽  
pp. 6193-6201 ◽  
Author(s):  
Felicitas Kolbe ◽  
Simon Krause ◽  
Volodymyr Bon ◽  
Irena Senkovska ◽  
Stefan Kaskel ◽  
...  
Keyword(s):  
High Pressure ◽  
Nmr Spectroscopy ◽  
Metal Organic Frameworks ◽  
129Xe Nmr ◽  
Metal Organic ◽  
Flexible Metal

Structural Characterization of Micro- and Mesoporous Carbon Materials Using In Situ High Pressure 129Xe NMR Spectroscopy

2014 ◽  
Vol 26 (10) ◽  
pp. 3280-3288 ◽  
Author(s):  
Martin Oschatz ◽  
Herbert C. Hoffmann ◽  
Julia Pallmann ◽  
Jana Schaber ◽  
Lars Borchardt ◽  
...  
Keyword(s):  
High Pressure ◽  
Nmr Spectroscopy ◽  
Structural Characterization ◽  
Mesoporous Carbon ◽  
Carbon Materials ◽  
129Xe Nmr ◽  
Mesoporous Carbon Materials

scholarly journals In Situ Monitoring of Heterogeneous Catalytic Hydrogenation via 129Xe NMR Spectroscopy and Proton MRI

ACS Catalysis ◽  
2019 ◽  
Vol 10 (2) ◽  
pp. 1417-1422 ◽  
Author(s):  
Dudari B. Burueva ◽  
Ekaterina V. Pokochueva ◽  
Xinpei Wang ◽  
Max Filkins ◽  
Alexandra Svyatova ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Catalytic Hydrogenation ◽  
In Situ Monitoring ◽  
129Xe Nmr ◽  
Heterogeneous Catalytic ◽  
Proton Mri ◽  
Heterogeneous Catalytic Hydrogenation

Intermolecular Interactions of Xe Atoms Confined in One-dimensional Nanochannels of Tris(o-phenylenedioxy)cyclotriphosphazene as Studied by High-pressure 129Xe NMR

2003 ◽  
Vol 58 (12) ◽  
pp. 727-734 ◽  
Author(s):  
Hirokazu Kobayashi ◽  
Takahiro Ueda ◽  
Keisuke Miyakubo ◽  
Taro Eguchi
Keyword(s):  
High Pressure ◽  
Nmr Spectroscopy ◽  
Chemical Shift ◽  
Pressure Dependence ◽  
Average Distance ◽  
Chemical Shift Tensor ◽  
Axially Symmetric ◽  
One Dimensional ◽  
129Xe Nmr ◽  
The One

The pressure dependence of the 129Xe chemical shift tensor confined in the Tris(o-phenylenedioxy) cyclotriphosphazene (TPP) nanochannel was investigated by high-pressure 129Xe NMR spectroscopy. The observed 129Xe spectrum in the one-dimensional TPP nanochannel (0.45 nm in diameter) exhibits a powder pattern broadened by an axially symmetric chemical shift tensor. As the pressure increases from 0.02 to 7.0 MPa, a deshielding of 90 ppm is observed for the perpendicularcomponent of the chemical shift tensor δ⊥, whereas a deshielding of about 30 ppm is observed for the parallel one, δ‖. This suggests that the components of the chemical shift tensor, δ‖ and δ⊥, are mainly dominated by the Xe-wall and Xe-Xe interaction, respectively. Furthermore, the effect of helium, which is present along with xenon gas, on the 129Xe chemical shift is examined in detail. The average distance between the Xe atoms in the nanochannel is estimated to be 0.54 nm. This was found by using δ⊥ at the saturated pressure of xenon, and comparing the increment of the chemicalshift value in δ⊥ to that of a β -phenol/Xe compound.

1-Hexene Hydroformylation with the Rhodium (I) Triphosphane Complex [Rh(CO){PhP(CH2CH2PPh2)2}]PF6: An In Situ Study Using High-Pressure NMR Spectroscopy

1997 ◽  
Vol 130 (11) ◽  
pp. 1633-1641 ◽  
Author(s):  
Claudio Bianchini ◽  
Andrea Meli ◽  
Maurizio Peruzzini ◽  
Francesco Vizza ◽  
Piero Frediani
Keyword(s):  
High Pressure ◽  
Nmr Spectroscopy ◽  
In Situ Study

Investigation into the Equilibrium of Iridium Catalysts for the Hydroformylation of Olefins by Combining In Situ High-Pressure FTIR and NMR Spectroscopy

ACS Catalysis ◽  
2014 ◽  
Vol 4 (7) ◽  
pp. 2097-2108 ◽  
Author(s):  
Christoph Kubis ◽  
Wolfgang Baumann ◽  
Enrico Barsch ◽  
Detlef Selent ◽  
Mathias Sawall ◽  
...  
Keyword(s):  
High Pressure ◽  
Nmr Spectroscopy ◽  
Iridium Catalysts

Characterization of adsorbed xenon in Zeolite-A, X, and Y by high-pressure 129Xe NMR spectroscopy

2004 ◽  
Vol 6 (23) ◽  
pp. 5427 ◽  
Author(s):  
Noriko Kato ◽  
Takahiro Ueda ◽  
Hironori Omi ◽  
Keisuke Miyakubo ◽  
Taro Eguchi
Keyword(s):  
High Pressure ◽  
Nmr Spectroscopy ◽  
Zeolite A ◽  
129Xe Nmr

Simultaneous In Situ Monitoring of Trimethoxysilane Hydrolysis Reactions Using Raman, Infrared, and Nuclear Magnetic Resonance (NMR) Spectroscopy Aided by Chemometrics and Ab Initio Calculations

2018 ◽  
Vol 72 (9) ◽  
pp. 1404-1415
Author(s):  
Xiaoyun Chen ◽  
Donald Eldred ◽  
Jing Liu ◽  
Hsu Chiang ◽  
Xianghuai Wang ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Nmr Spectroscopy ◽  
Magnetic Resonance ◽  
Reaction Rates ◽  
In Situ Monitoring ◽  
Spectroscopic Techniques ◽  
Wide Range ◽  
Nuclear Magnetic ◽  
Hydrolysis Reactions

Sol-gels are found in many different scientific fields and have very broad applications. They are often prepared by the hydrolysis and condensation of alkoxysilanes such as trimethoxysilanes, which are commonly used as precursors in the preparation of silsequioxanes via the sol-gel process. The reaction rates of such reactions are influenced by a wide range of experimental factors such as temperature, pH, catalyst, etc. In this study, we combined multiple in situ spectroscopic techniques to monitor the hydrolysis and partial condensation reactions of methyltrimethoxysilane and phenyltrimethoxysilane. A rich set of kinetics information on intermediate species of the hydrolysis reactions were obtained and used for kinetics modeling. Raman and nuclear magnetic resonance (NMR) spectroscopy provided the most information about hydrolysis and NMR provided the most information about condensation. A quantitative method based on Raman spectra to quantify the various transient intermediate hydrolysis products was developed using NMR as the primary method, which can be deployed in the field where it is impractical to carry out NMR measurements.

scholarly journals The impact of defects and crystal size on negative gas adsorption in DUT-49 analyzed by in situ 129Xe NMR spectroscopy.

2020 ◽  
Author(s):  
Simon Krause ◽  
Florian Reuter ◽  
Sebastian Ehrling ◽  
Volodymyr Bon ◽  
Irena Senkovska ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Chemical Shift ◽  
Crystal Size ◽  
Gas Adsorption ◽  
Adsorption Behavior ◽  
129Xe Nmr ◽  
High Concentrations ◽  
The Impact ◽  
Fluid Interactions

The origin of crystal size-dependent adsorption behavior of flexible metal-organic frameworks is increasingly studied. In this contribution, we probe the solid-fluid interactions of DUT-49 crystals of different size by in situ 129Xe NMR spectroscopy at 200 K. With decreasing size of the crystals, the average solid-fluid interactions are found to decrease reflected by a decrease in chemical shift of adsorbed xenon from 230 to 200 ppm explaining the lack of adsorption-induced transitions for smaller crystals. However, recent studies propose that these results can also originate from the presence of lattice defects. To investigate the influence of defects on the adsorption behavior of DUT-49 we synthesized a series of samples with tailored defect concentrations and characterized them by in situ 129Xe NMR. In comparison to the results obtained for crystals with different size we find pronounced changes of the adsorption behavior and influence of the chemical shift only for very high concentrations of defects, which further emphasizes the important role of particle size phenomena.

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