39K, 40K and 41K Nuclear Magnetic Resonance Studies

Sahm, W.; Schwenk, A.

doi:10.1515/zna-1974-1208

Cited by 35 publications

(17 citation statements)

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“…Of course, the accuracy of the result clearly depends on what the Another situation where isotope shifts have some effect is when signals of the reference compound are affected, for instance for 19 F measurements. In this case, the signal is split into four lines with intensities approximately 27:27:9:1 because the natural-abundance isotopic ratio 35 Cl: 37 Cl is ca. 3:1.…”

Section: Referencing Proceduresmentioning

confidence: 99%

“…{Sodium 3-(trimethylsilyl)propanoate (TSP) is another salt that has been suggested [58].} When DSS is used as a reference, it has been recommended [4] 31 P studies in aqueous solution, whereas Table 1 recommends 85% phosphoric acid (external), which has been used more widely, particularly for chemical systems where use of an internal reference is not feasible. The two secondary references differ by about 3 ppm, so it is important to specify which is being used.…”

Section: Alternative Reference Compoundsmentioning

confidence: 99%

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

Harris

Becker

Menezes

et al. 2001

Pure and Applied Chemistry

1,197

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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Section: Referencing Proceduresmentioning

confidence: 99%

Section: Alternative Reference Compoundsmentioning

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

1,197

1,084

View full text Add to dashboard Cite

show abstract

“…We recommend that when 13 C chemical shifts are referenced to DSS, that point should be made clear by using a notation such as d DSS ð 13 CÞ. Reference [4] recommends use of trimethyl phosphate (internal) as a secondary reference for 31 P studies in aqueous solution, whereas Table 1 recommends 85% phosphoric acid (external), which has been used more widely, particularly for chemical systems where use of an internal reference is not feasible. The two secondary references differ by about 3 ppm, so it is important to specify which is being used.…”

Section: Alternative Reference Compoundsmentioning

confidence: 99%

NMR Nomenclature: Nuclear Spin Properties and Conventions for Chemical Shifts

Harris

Becker

Menezes

et al. 2002

Solid State Nuclear Magnetic Resonance

302

304

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“…In such situations the correction term in parentheses in Eqn (8) Another situation where isotope shifts have some effect is when signals of the reference compound are affected, for instance for 19 F measurements. In this case the signal is split into four lines with intensities approximately 27 : 27 : 9 : 1 because the natural-abundance isotopic ratio 35 Cl : 37 Cl is ca 3 : 1. Since CFCl 3 is firmly accepted as the local reference for 19 F, it is not reasonable to suggest a new alternative.…”

Section: Referencing Proceduresmentioning

confidence: 99%