183 W nuclear dipole moment determined by gas-phase NMR spectroscopy

Garbacz, Piotr; Makulski, Włodzimierz

doi:10.1016/j.chemphys.2017.10.003

Cited by 6 publications

(3 citation statements)

References 19 publications

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“…The authors determined the nuclear magnetic moment with much higher accuracy for an unstable 26 Na nucleus (1.1 s half-life time) using an improved version of the β-technique NMR combined with ab initio calculation of nuclear magnetic shielding performed for the stable 23 Na reference. New studies and further possible improvements in the determination of magnetic moments for stable nuclei also appeared [101][102][103][104], and three review papers on the same subject were published [105][106][107].…”

Section: Nuclear Magnetic Dipole Momentsmentioning

confidence: 99%

“…It is very helpful for the cross-checking of available experimental results and permits a better understanding of nuclear magnetic shielding. In our opinion, the application of Equation (10) is very promising because the number of reliable data for nuclear magnetic moments is quickly growing [ 83 , 86 , 87 , 88 , 89 , 90 , 91 , 92 , 93 , 94 , 95 , 96 , 97 , 98 , 99 , 100 , 101 , 102 , 103 , 104 , 105 , 106 , 107 ]. We also have an excellent reference standard of shielding, which is independent of temperature, the isolated helium-3 atom.…”

Section: Universal Approach To Shielding Measurementsmentioning

confidence: 99%

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Measurements of Nuclear Magnetic Shielding in Molecules

Jackowski,

Wilczek

2024

Molecules

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The origin of nuclear magnetic shielding in diamagnetic molecules is discussed, pointing out various contributions to the shielding from electrons and the effects of intra- and intermolecular interactions. In NMR practice, chemical shifts are determined first as the measure of shielding in observed samples. The descriptions of shielding and chemical shifts are not fully consistent. Gas phase studies permit the withdrawal of intermolecular contributions from shielding and obtaining the magnetic shielding data in isolated molecules. The shielding determination in molecules is possible using at least three methods delivering the reference shielding standards for selected nuclei. The known shielding of one magnetic nucleus can be transferred to other nuclei if the appropriate nuclear magnetic moments are available with satisfactory accuracy. It is possible to determine the nuclear magnetic dipole moments using the most advanced ab initio shielding calculations jointly with the NMR frequencies measurements for small-sized isolated molecules. Helium-3 gas is postulated as all the molecules’ primary and universal reference standard of shielding. It can be easily applied using common deuterium lock solvents as the secondary reference standards. The measurements of absolute shielding are available for everyone with the use of standard NMR spectrometers.

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Section: Nuclear Magnetic Dipole Momentsmentioning

confidence: 99%

Section: Universal Approach To Shielding Measurementsmentioning

confidence: 99%

Measurements of Nuclear Magnetic Shielding in Molecules

Jackowski,

Wilczek

2024

Molecules

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“…This value, recalculated from Equation ( 10) using fluorine parameters -frequency and shielding constantis -406.2 ppm is in moderate agreement with the calculated one. Another important modification of the procedure shown above relies on measurements of 183 WF6 substance where CF4 or C2F6 gaseous buffers were used [42]. They are necessary for lengthening the relaxation times and narrowing the 183 W resonance signals.…”

Section: Preprintsmentioning

confidence: 99%

Probing Nuclear Dipole Moments and Magnetic Shielding Constants Through 3-Helium NMR Spectroscopy

Makulski¹

2022

Preprint

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Multinuclear NMR studies of the gaseous mixtures that involve volatile compounds and 3He atoms are featured in this review. Precise analyses of the 3He and other nuclei resonance frequencies show linear dependences on the gas density. Extrapolation of the gas phase results to the zero-pressure limit gives ν0(3He) and ν0(nX) resonance frequencies of nuclei in a single 3-helium atom and nuclei in molecules at a given temperature. The NMR frequency comparison method provides an approach for determining different nuclear magnetic moments. Application of quantum chemical shielding calculations which include a more complete and careful theoretical treatment allows the shielding of isolated molecules to be achieved with great accuracy and precision. They are used for evaluation of nuclear moments without shielding impact on bare nuclei: 10/11B, 13C, 14N, 17O, 19F, 21Ne, 29Si, 31P, 33S, 35/37Cl, 33S , 83Kr, 129/131Xe, and 183W. On the other hand, new results of nuclear moments were used for reevaluation of absolute nuclear magnetic shielding in molecules under study. Additionally, 3He gas in water solutions of lithium and sodium salts was used for measurements of 6/7Li and 23Na magnetic moments and reevaluation of shielding parameters of Li+ and Na+ water solvated cations. In this paper, guest 3He atoms that play a role in probing the electron density in many host macromolecules are presented as well.

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Gas-phase NMR of nuclei other than 1H and 13C

Garbacz¹,

Makulski²

2023

Comprehensive Inorganic Chemistry III

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183 W nuclear dipole moment determined by gas-phase NMR spectroscopy

Cited by 6 publications

References 19 publications

Measurements of Nuclear Magnetic Shielding in Molecules

Measurements of Nuclear Magnetic Shielding in Molecules

Probing Nuclear Dipole Moments and Magnetic Shielding Constants Through 3-Helium NMR Spectroscopy

Gas-phase NMR of nuclei other than 1H and 13C

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