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The Radiofrequency NMR Spectra of Lithium Salts in Water; Reevaluation of Nuclear Magnetic Moments for 6Li and 7Li Nuclei

Faculty of Chemistry, University of Warsaw, L. Pasteura 1, 02-093 Warsaw, Poland
Magnetochemistry 2018, 4(1), 9; https://doi.org/10.3390/magnetochemistry4010009
Received: 2 December 2017 / Revised: 25 December 2017 / Accepted: 4 January 2018 / Published: 10 January 2018
(This article belongs to the Special Issue Nuclear Magnetic Resonance Spectroscopy)
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Abstract

LiCl and LiNO3 water solutions in the presence of small amounts of 3-helium have been investigated by means of multinuclear resonance spectroscopy. The resulting concentration dependences of the 3He, 6,7Li+, 14NO3 and 35Cl resonance radiofrequencies are reported in the infinite limit. This data along with new theoretical corrections of shielding lithium ions was analyzed by a known NMR relationship method. Consequently, the nuclear magnetic moments of 6Li and 7Li were established against that of the helium-3 dipole moment: μ(6Li) = +0.8220457(50)μN and μ(7Li) = +3.256418(20)μN. The new results were shown to be very close to the previously obtained values of the (ABMR) atomic beam magnetic resonance method. This experiment proves that our helium method is well suited for establishing dipole moments from NMR measurements performed in water solutions. This technique is especially valuable when gaseous substances of the needed element are not available. All shielding constants of species present in water solutions are consistent with new nuclear magnetic moments and these taken as a reference. Both techniques—NMR and ABMR—give practically the same results provided that all shielding corrections are properly made. View Full-Text
Keywords: 6Li and 7Li nuclear magnetic moments; NMR liquid-phase studies; nuclear magnetic shielding constants 6Li and 7Li nuclear magnetic moments; NMR liquid-phase studies; nuclear magnetic shielding constants
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Makulski, W. The Radiofrequency NMR Spectra of Lithium Salts in Water; Reevaluation of Nuclear Magnetic Moments for 6Li and 7Li Nuclei. Magnetochemistry 2018, 4, 9.

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