Journal ArticleDOI
Bulk susceptibility corrections in nuclear magnetic resonance experiments using superconducting solenoids
David Live,Sunney I. Chan +1 more
Reads0
Chats0
TLDR
In this article, the problem of correcting the observed chemical shift for the difference in the bulk susceptibilities of the sample and the reference compound was treated for the Varian A-60 or HA-100 spectrometer.Abstract:
WHEN A NUCLEAR magnetic resonance (NMR) spectrum is referenced with an external standard contained either in a capillary inserted coaxially in a cylindrical sample or in the annular region of a coaxial sample, the observed chemical shift must be corrected for the difference in the bulk susceptibilities of the sample and the reference compound ( I ) . This problem has been treated at length for the conventional magnet/sample configuration, such as that of the Varian A-60 or HA-100 spectrometer, where the applied polarizing magnetic field is transverse to the long axis of the cylindrical sample (2). For this magnet/sample geometry, the bulk susceptibility correction to the observed chemical shift has been shown to beread more
Citations
More filters
Journal ArticleDOI
1H, 13C and 15N chemical shift referencing in biomolecular NMR
David S. Wishart,Colin G. Bigam,Jian Yao,Frits Abildgaard,H J Dyson,Eric Oldfield,John L. Markley,Brian D. Sykes +7 more
TL;DR: In this paper, a considerable degree of variability exists in the way that 1H, 13C and 15N chemical shifts are reported and referenced for biomolecules and the authors explore some of the reasons for this situation and propose guidelines for future chemical shift referencing and for conversion from many common 1H and 13C chemical shift standards, now used in biomolecular NMR, to those proposed here.
Journal ArticleDOI
Chemical shift referencing in MAS solid state NMR.
Corey R. Morcombe,Kurt W. Zilm +1 more
TL;DR: Solid state and liquid phase NMR shifts obtained by magic angle spinning with external referencing agree with those measured using typical solution NMR hardware with the sample tube aligned with the applied field as long as magnetic susceptibility corrections and solvent shifts are taken into account.
Journal ArticleDOI
Bulk magnetic susceptibility shifts in nmr studies of compartmentalized samples: use of paramagnetic reagents
TL;DR: The theory of the bulk magnetic susceptibility shift of a nuclear resonance frequency caused by a paramagnetic compound is reworked and organized to offer new interpretations for the results of several experiments published in the last few years.
Journal ArticleDOI
Measurement of 13C chemical shifts in solids
TL;DR: In this article, a pulse sequence and sample geometry which allows the measurement of 13 C chemical shifts of solid materials relative to liquid tetramethylsilane (TMS) is described.
Journal ArticleDOI
Chemical shift standards in high-resolution solid-state NMR (1) 13C, 29Si, and 1H nuclei.
TL;DR: In this article, the resonance frequencies of 13C, 29Si, and 1H nuclei in pure tetramethylsilane have been measured accurately by spinning the liquid sample at the magic angle, which are free from the effects of the bulk magnetic susceptibility and the solvent.
References
More filters
Journal ArticleDOI
The Time Average Magnetic Field at the Nucleus in Nuclear Magnetic Resonance Experiments
TL;DR: In this paper, the effect of magnetic shielding fields on the attainable precision in the measurement of nuclear moments is discussed and an experimental study is made of two of these fields: the magnetic shielding field in molecules and the magnetization field of paramagnetic ions added to a sample.
Journal ArticleDOI
Standardization of N.M.R. High Resolution Spectra
J. R. Zimmerman,M. R. Foster +1 more