Investigation of grafted mesoporous silicon sponge using hyperpolarized 129Xe NMR spectroscopy

2018 ◽  
Vol 33 (17) ◽  
pp. 2637-2645 ◽  
Author(s):  
Yougang Mao ◽  
Dokyoung Kim ◽  
Russell Hopson ◽  
Michael J. Sailor ◽  
Li-Qiong Wang
Keyword(s):  
Nmr Spectroscopy ◽  
Mesoporous Silicon ◽  
129Xe Nmr ◽  
Hyperpolarized 129Xe ◽  
Image Position

Abstract

Shape-persistent macrocycles — Self-assembly reactions and characterization by hyperpolarized 129Xe NMR spectroscopy**In memory of Professor Michael M. Pollard.

2011 ◽  
Vol 89 (10) ◽  
pp. 1264-1276 ◽  
Author(s):  
Katie Campbell ◽  
Kristopher J. Ooms ◽  
Michael J. Ferguson ◽  
Peter J. Stang ◽  
Roderick E. Wasylishen ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Self Assembly ◽  
Chemical Shifts ◽  
Crystallographic Analysis ◽  
Temperature Dependent ◽  
129Xe Nmr ◽  
Spectroscopic Analyses ◽  
Conjugated Macrocycles ◽  
Hyperpolarized 129Xe ◽  
Solvent Molecules

The use of three shape-persistent, conjugated macrocycles 2a–2c as ligands for self-assembly reactions is described. The macrocycles have been characterized through a combination of spectroscopic analyses and, for compounds 2b and 2c, X-ray crystallographic analysis. Whereas the reaction of 2a with the cis-Pt(II) species 3 successfully provides the porous solid 4a, the analogous reaction of 2b and 2c with 3 leads only to mixtures of products. The application of continuous-flow hyperpolarized 129Xe NMR spectroscopy to investigate the solid-state pores of macrocycles 2b and 2c and the supramolecular complex 4a as a function of temperature is described. All three species show permanent porosity upon removal of co-crystallized solvent molecules. Using trends in the 129Xe chemical shifts and temperature-dependent dynamics of Xe atoms in the solids, information is obtained on the nature of the pores in these systems. Using the 129Xe NMR data for complex 4a, the effective heat of adsorption (ΔHads) was calculated to be ~29 kJ mol–1.

Exploring Local Disorder within CAU-1 Frameworks Using Hyperpolarized 129Xe NMR Spectroscopy

Langmuir ◽  
2018 ◽  
Vol 34 (42) ◽  
pp. 12538-12548 ◽  
Author(s):  
Tobias W. Kemnitzer ◽  
Carsten B. L. Tschense ◽  
Thomas Wittmann ◽  
Ernst A. Rössler ◽  
Jürgen Senker
Keyword(s):  
Nmr Spectroscopy ◽  
129Xe Nmr ◽  
Hyperpolarized 129Xe ◽  
Local Disorder

Hyperpolarized 129Xe nuclear magnetic resonance study of mesoporous silicon sponge materials

2017 ◽  
Vol 32 (16) ◽  
pp. 3038-3045 ◽  
Author(s):  
Yougang Mao ◽  
Dokyoung Kim ◽  
Jinmyoung Joo ◽  
Michael J. Sailor ◽  
Russell Hopson ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Nuclear Magnetic Resonance Study ◽  
Magnetic Resonance Study ◽  
Mesoporous Silicon ◽  
Hyperpolarized 129Xe ◽  
Image Position ◽  
Nuclear Magnetic

Abstract

Applications of Hyperpolarized 129Xe NMR Spectroscopy to the Study of Materials

2002 ◽  
pp. 115-122
Author(s):  
I. L. Moudrakovski ◽  
A. V. Nossov ◽  
V. V. Terskkh ◽  
S. Lang ◽  
E. B. Brouwer ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
129Xe Nmr ◽  
Hyperpolarized 129Xe

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.

ChemInform Abstract: Characterization of NiNa-Y Zeolite by 129Xe NMR Spectroscopy.

1986 ◽  
Vol 17 (18) ◽  
Author(s):  
E. W. SCHARPF ◽  
R. W. CRECELY ◽  
B. C. GATES ◽  
C. DYBOWSKI
Keyword(s):  
Nmr Spectroscopy ◽  
Y Zeolite ◽  
Abstract Characterization ◽  
129Xe Nmr
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