Spin dynamics and thermodynamics in solid‐state NMR cross polarization

1986 ◽  
Vol 84 (8) ◽  
pp. 4243-4255 ◽  
Author(s):  
M. H. Levitt ◽  
D. Suter ◽  
R. R. Ernst
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Spin Dynamics ◽  
Cross Polarization

Solid State NMR Studies of the Adsorbed States of Formic Acid on Y Zeolites

1980 ◽  
Vol 3 ◽  
Author(s):  
T. Michael Duncan ◽  
Robert W. Vaughan
Keyword(s):  
Solid State ◽  
Formic Acid ◽  
Solid State Nmr ◽  
Double Resonance ◽  
Chemical Shift Anisotropy ◽  
Surface States ◽  
Cross Polarization ◽  
Nmr Studies ◽  
Y Zeolites ◽  
Nmr Techniques

ABSTRACTSeveral multiple-pulse double-resonance NMR techniques have been applied to isolate and characterize the spectra of the adsorbed states of formic acid on two Y zeolites. The two surface states, bidentatT3 and ynidentate, possess different motional properties and 13C - H cross-polarization techniques may be used to separate the spectra. The 13C chemical shift anisotropy is founa to iorrelate with the symmetry of the formate species. The H spectrum of the carbonyl hydrogen, selectively observed with the dipolardifference method, indicates that this hydrogen becomes more acidic upon adsorption.

Rapid Acquisition of14N Solid-State NMR Spectra with Broadband Cross Polarization

2013 ◽  
Vol 19 (48) ◽  
pp. 16469-16475 ◽  
Author(s):  
Kristopher J. Harris ◽  
Stanislav L. Veinberg ◽  
Christopher R. Mireault ◽  
Adonis Lupulescu ◽  
Lucio Frydman ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Nmr Spectra ◽  
Cross Polarization ◽  
Rapid Acquisition

Kinetics of solid-state NMR cross-polarization from protons to carbon-13 in surgical sutures

2009 ◽  
Vol 35 (4) ◽  
pp. 230-234 ◽  
Author(s):  
Marcin Sobczak ◽  
Tadeusz Chreptowicz ◽  
Joanna Kolmas ◽  
Waclaw Kolodziejski
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Cross Polarization ◽  
Surgical Sutures ◽  
Kinetics Of

scholarly journals Revealing the Surface Structure of CdSe Nanocrystals by Dynamic Nuclear Polarization-Enhanced 77Se and 113Cd Solid-State NMR Spectroscopy

2021 ◽  
Author(s):  
Yunhua Chen ◽  
Rick Dorn ◽  
Michael Hanrahan ◽  
Lin Wei ◽  
Rafael Blome-Fernandez ◽  
...  
Keyword(s):  
Solid State ◽  
Dynamic Nuclear Polarization ◽  
Solid State Nmr ◽  
Nuclear Polarization ◽  
Surface Structures ◽  
Cdse Nanocrystals ◽  
Magic Angle ◽  
Cross Polarization ◽  
Zinc Blende ◽  
Detailed Surface

<p>Dynamic nuclear polarization (DNP) solid-state NMR (SSNMR) spectroscopy was used to obtain detailed surface structures of zinc blende CdSe nanocrystals (NCs) with plate or spheroidal morphologies and which are capped by carboxylic acid ligands. 1D <sup>113</sup>Cd and <sup>77</sup>Se cross-polarization magic angle spinning (CPMAS) NMR spectra revealed distinct signals from Cd and Se atoms on the surface of the NCs, and those residing in bulk-like environments below the surface. <sup>113</sup>Cd cross-polarization magic-angle-turning (CP-MAT) experiments identified CdSe<sub>3</sub>O, CdSe<sub>2</sub>O<sub>2</sub>, and CdSeO<sub>3</sub> Cd coordination environments on the surface of the NCs, where the oxygen atoms are presumably from coordinated carboxylate ligands. The sensitivity gain from DNP enabled natural isotopic abundance 2D homonuclear <sup>113</sup>Cd-<sup>113</sup>Cd and <sup>77</sup>Se-<sup>77</sup>Se and heteronuclear <sup>113</sup>Cd-<sup>77</sup>Se scalar correlation solid-state NMR experiments that reveal the connectivity of the Cd and Se atoms. Importantly, <sup>77</sup>Se{<sup>113</sup>Cd} scalar heteronuclear multiple quantum coherence (<i>J</i>-HMQC) experiments were used to selectively measure one-bond <sup>77</sup>Se-<sup>113</sup>Cd scalar coupling constants (<sup>1</sup><i>J</i>(<sup>77</sup>Se, <sup>113</sup>Cd)). With knowledge of <sup>1</sup><i>J</i>(<sup>77</sup>Se, <sup>113</sup>Cd), heteronuclear <sup>77</sup>Se{<sup>113</sup>Cd} spin echo (<i>J</i>-resolved) NMR experiments were then used to determine the number of Cd atoms bonded to Se atoms and vice versa. The <i>J</i>-resolved experiments directly confirmed that major Cd and Se surface species have CdSe<sub>2</sub>O<sub>2</sub> and SeCd<sub>4</sub> stoichiometries, respectively. Considering the crystal structure of zinc blende CdSe, and the similarity of the solid-state NMR data for the platelets and spheroids, we conclude that the surface of the spheroidal CdSe NCs is primarily composed of {100} facets. The methods outlined here will generally be applicable to obtain detailed surface structures of various main group semiconductors.</p>

scholarly journals Molecular and electron-spin dynamics in [M(H2O)6][AB6] as studied by solid state NMR.

2003 ◽  
Vol 52 (3) ◽  
pp. 157-163 ◽  
Author(s):  
Takahiro IIJIMA ◽  
Motohiro MIZUNO ◽  
Masahiko SUHARA ◽  
Kazunaka ENDO
Keyword(s):  
Solid State ◽  
Electron Spin ◽  
Solid State Nmr ◽  
Spin Dynamics ◽  
Electron Spin Dynamics
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