Two‐dimensional separation of dipolar and scaled isotropic chemical shift interactions in magic angle NMR spectra

1982 ◽  
Vol 77 (4) ◽  
pp. 1686-1689 ◽  
Author(s):  
Michael Munowitz ◽  
Walter P. Aue ◽  
Robert G. Griffin
Keyword(s):  
Chemical Shift ◽  
Nmr Spectra ◽  
Magic Angle ◽  
Isotropic Chemical Shift ◽  
Two Dimensional

An isotropic chemical shift–chemical shift anisotropic correlation experiment using discrete magic angle turning

2009 ◽  
Vol 198 (1) ◽  
pp. 105-110 ◽  
Author(s):  
Jian Zhi Hu ◽  
Jesse A. Sears ◽  
Ja Hun Kwak ◽  
David W. Hoyt ◽  
Yong Wang ◽  
...  
Keyword(s):  
Chemical Shift ◽  
Magic Angle ◽  
Isotropic Chemical Shift ◽  
Correlation Experiment

Two-dimensional MAS–NMR spectra which correlate fast and slow magic angle spinning sideband patterns

2001 ◽  
Vol 344 (3-4) ◽  
pp. 367-373 ◽  
Author(s):  
Charles Crockford ◽  
Helen Geen ◽  
Jeremy J. Titman
Keyword(s):  
Nmr Spectra ◽  
Magic Angle Spinning ◽  
Mas Nmr ◽  
Magic Angle ◽  
Two Dimensional ◽  
Angle Spinning

11 B NMR spectra and structure of boric oxide and alkali borate glasses

1990 ◽  
Vol 429 (1876) ◽  
pp. 1-15 ◽  
Keyword(s):  
Chemical Shift ◽  
Nmr Spectra ◽  
Structural Model ◽  
Magic Angle Spinning ◽  
Boric Oxide ◽  
Magic Angle ◽  
Borate Glasses ◽  
Alkali Oxide ◽  
Alkali Borate Glasses ◽  
Angle Spinning

High-resolution 11 B magic-angle-spinning (MAS) NMR investigations of boric oxide and alkali borate glasses have been carried out. The chemical shift of the trigonal boron shows anomalous behaviour around 10 mol. % alkali oxide. In an attempt to explain this unusual feature, we have carefully examined the structural model for B 2 O 3 glass. The study suggests that around 66% of the boron atoms is likely to be present in the boroxol units, the rest being present in loose BO 3/2 units. This model is not only consistent with the earlier literature but also shows that stringent topochemical factors are involved in the formation of the tetraborate and the diborate units in alkali borate glasses. It seems plausible that the remarkable tendency of B 2 O 3 to vitrify may itself have a structural origin.

Chemical shift correlated two-dimensional nmr spectroscopy and its application to solving the proton nmr spectra of oligoribonucleotides

1980 ◽  
Vol 58 (18) ◽  
pp. 1947-1956 ◽  
Author(s):  
Alex D. Bain ◽  
Russell A. Bell ◽  
Jeremy R. Everett ◽  
Donald W. Hughes
Keyword(s):  
Nmr Spectroscopy ◽  
Chemical Shift ◽  
Nmr Spectra ◽  
Pulse Sequence ◽  
Chemical Shifts ◽  
Proton Nmr ◽  
Two Dimensional

An alternative two-dimensional nmr pulse sequence, (90°–t1/2–90°–t1/2–FID),correlates the chemical shifts of coupled nuclei. The application of this technique to the solution of the complicated proton nmr spectra of oligoribonucleotides is discussed.

scholarly journals Determination of the Full 207Pb Chemical Shift Tensor of Anglesite, PbSO4, and Correlation of the Isotropic Shift to Lead–Oxygen Distance in Natural Minerals

Crystals ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 43 ◽  
Author(s):  
Otto Zeman ◽  
Jennifer Steinadler ◽  
Rupert Hochleitner ◽  
Thomas Bräuniger
Keyword(s):  
Chemical Shift ◽  
Single Crystal ◽  
Polycrystalline Sample ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Isotropic Chemical Shift ◽  
Natural Minerals ◽  
Angle Spinning ◽  
Data Acquisition And Processing

The full 207 Pb chemical shift (CS) tensor of lead in the mineral anglesite, PbSO 4 , was determined from orientation-dependent nuclear magnetic resonance (NMR) spectra of a large natural single crystal, using a global fit over two rotation patterns. The resulting tensor is characterised by the reduced anisotropy Δ δ = ( - 327 ± 4 ) ppm, asymmetry η C S = 0 . 529 ± 0 . 002 , and δ i s o = ( - 3615 ± 3 ) ppm, with the isotropic chemical shift δ i s o also verified by magic-angle spinning NMR on a polycrystalline sample. The initially unknown orientation of the mounted single crystal was included in the global data fit as well, thus obtaining it from NMR data only. By use of internal crystal symmetries, the amount of data acquisition and processing for determination of the CS tensor and crystal orientation was reduced. Furthermore, a linear correlation between the 207 Pb isotropic chemical shift and the shortest Pb–O distance in the co-ordination sphere of Pb 2 + solely surrounded by oxygen has been established for a large database of lead-bearing natural minerals.

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