Effects of macroscopic spinning upon linewidth of NMR signals of liquid in magnetically inhomogeneous systems

Doskočilová, D.; Tao, Dang Duc; Schneider, Bohdan

doi:10.1007/bf01589476

Cited by 56 publications

(35 citation statements)

References 9 publications

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“…High-resolution NMR of solids almost invariably relies on magicangle spinning and, as discussed above, this eliminates the effects of differences in bulk isotropic magnetic susceptibilities. Early articles (61,62) addressed this matter and a recent review by VanderHart (45), which refers to both liquids and solutions, further discusses the influence of MAS for referencing spectra. Unfortunately, the situation is simple only for systems with isotropic magnetic susceptibility.…”

Section: Solidsmentioning

confidence: 99%

NMR nomenclature: Nuclear spin properties and conventions for chemical shifts (IUPAC recommendations 2001)

Harris¹,

Becker²,

Menezes³

et al. 2002

Concepts Magn. Reson.

155

161

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ABSTRACT:A unified scale is recommended for reporting the NMR chemical shifts of all nuclei relative to the 1 H resonance of tetramethylsilane. The unified scale is designed to provide a precise ratio, ⌶, of the resonance frequency of a given nuclide to that of the primary reference, the 1 H resonance of tetramethylsilane (TMS) in dilute solution (volume fraction, Ͻ 1%) in chloroform. Referencing procedures are discussed, including matters of practical application of the unified scale. Special attention is paid to recommended reference samples and values of ⌶ for secondary references on the unified scale are listed, many of which are the results of new measurements. Some earlier recommendations relating to the reporting of chemical shifts are endorsed. The chemical shift, ␦, is redefined to avoid previous ambiguities but to leave practical usage unchanged. Relations between the unified scale and recently published recommendations for referencing in aqueous solutions (for specific use in biochemical work) are discussed, as well as the special effects of working in the solid state with magic-angle spinning. In all, nine new recommendations relating to chemical shifts are made. Standardized nuclear spin data are also presented in tabular form for the stable (and some unstable) isotopes of all elements with non-zero

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Section: Solidsmentioning

confidence: 99%

NMR nomenclature: Nuclear spin properties and conventions for chemical shifts (IUPAC recommendations 2001)

Harris¹,

Becker²,

Menezes³

et al. 2002

Concepts Magn. Reson.

155

161

View full text Add to dashboard Cite

show abstract

“…It has been shown [61][62][63] that, in theory, bulk isotropic magnetic susceptibility effects are eliminated by spinning an infinitely long cylindrical sample with its axis at the magic angle (54.7°) to the static magnetic field of an NMR spectrometer. Therefore, in principle, magic-angle spinning (MAS) can be used in the external referencing method to obtain chemical shifts free from bulk susceptibility problems.…”

Section: Magic-angle Spinningmentioning

confidence: 99%

“…High-resolution NMR of solids almost invariably relies on magic-angle spinning, and, as discussed in Section 3.8, this eliminates the effects of differences in bulk isotropic magnetic susceptibilities. Early papers [61,62] addressed this matter, and a recent review by VanderHart [45], which refers to both liquids and solutions, further discusses the influence of MAS for referencing spectra. Unfortunately, the situation is simple only for systems with isotropic magnetic susceptibility.…”

Section: Solidsmentioning

confidence: 99%

NMR nomenclature. Nuclear spin properties and conventions for chemical shifts(IUPAC Recommendations 2001)

Harris

Becker

Menezes

et al. 2001

Pure and Applied Chemistry

1,220

1,084

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Republication or reproduction of this report or its storage and/or dissemination by electronic means is permitted without the need for formal IUPAC permission on condition that an acknowledgmentAbstract: A unified scale is recommended for reporting the NMR chemical shifts of all nuclei relative to the 1 H resonance of tetramethylsilane (TMS). The unified scale is designed to provide a precise ratio, Ξ, of the resonance frequency of a given nuclide to that of the primary reference, the 1 H resonance of TMS in dilute solution (volume fraction, ϕ < 1%) in chloroform. Referencing procedures are discussed, including matters of practical application of the unified scale. Special attention is paid to recommended reference samples, and values of Ξ for secondary references on the unified scale are listed, many of which are the results of new measurements.Some earlier recommendations relating to the reporting of chemical shifts are endorsed. The chemical shift, δ, is redefined to avoid previous ambiguities but to leave practical usage unchanged. Relations between the unified scale and recently published recommendations for referencing in aqueous solutions (for specific use in biochemical work) are discussed, as well as the special effects of working in the solid state with magic-angle spinning. In all, nine new recommendations relating to chemical shifts are made.Standardized nuclear spin data are also presented in tabular form for the stable (and some unstable) isotopes of all elements with nonzero quantum numbers. The information given includes quantum numbers, isotopic abundances, magnetic moments, magnetogyric ratios and receptivities, together with quadrupole moments and line-width factors where appropriate.

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“…* * To be more precise, the dominant proton resonance line from 12 C 4 1 H 12 28 Si. Resonances at slightly different chemical shifts can be observed from other isotopomers (usually as 13 C and 29 Si ''satellites'').…”

Section: Introduction *mentioning

confidence: 97%

Further Conventions for NMR Shielding and Chemical Shifts (IUPAC Recommendations 2008)

Harris

Becker

Menezes

et al. 2008

Magnetic Reson in Chemistry

135

132

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IUPAC has published a number of recommendations regarding the reporting of nuclear magnetic resonance (NMR) data, especially chemical shifts. The most recent publication [Pure Appl. Chem. 73, 1795 (2001)] recommended that tetramethylsilane (TMS) serve as a universal reference for reporting the shifts of all nuclides, but it deferred recommendations for several aspects of this subject. This document first examines the extent to which the (1)H shielding in TMS itself is subject to change by variation in temperature, concentration, and solvent. On the basis of recently published results, it has been established that the shielding of TMS in solution [along with that of sodium-3-(trimethylsilyl)propanesulfonate, DSS, often used as a reference for aqueous solutions] varies only slightly with temperature but is subject to solvent perturbations of a few tenths of a part per million (ppm). Recommendations are given for reporting chemical shifts under most routine experimental conditions and for quantifying effects of temperature and solvent variation, including the use of magnetic susceptibility corrections and of magic-angle spinning (MAS). This document provides the first IUPAC recommendations for referencing and reporting chemical shifts in solids, based on high-resolution MAS studies. Procedures are given for relating (13)C NMR chemical shifts in solids to the scales used for high-resolution studies in the liquid phase. The notation and terminology used for describing chemical shift and shielding tensors in solids are reviewed in some detail, and recommendations are given for best practice.

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Effects of macroscopic spinning upon linewidth of NMR signals of liquid in magnetically inhomogeneous systems

Cited by 56 publications

References 9 publications

NMR nomenclature: Nuclear spin properties and conventions for chemical shifts (IUPAC recommendations 2001)

NMR nomenclature: Nuclear spin properties and conventions for chemical shifts (IUPAC recommendations 2001)

NMR nomenclature. Nuclear spin properties and conventions for chemical shifts(IUPAC Recommendations 2001)

Further Conventions for NMR Shielding and Chemical Shifts (IUPAC Recommendations 2008)

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