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NMR absolute shielding scale and nuclear magnetic dipole moment of 207 Pb

Permanent link
https://hdl.handle.net/10037/24989
DOI
https://doi.org/10.1039/c6cp01781a
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Date
2016-05-24
Type
Journal article
Tidsskriftartikkel
Peer reviewed

Author
Adrjan, Bożena; Makulski, Włodzimierz; Jackowski, Karol; Demissie, Taye Beyene; Ruud, Kenneth; Antušek, Andrej; Jaszuński, Michał
Abstract
An absolute shielding scale is proposed for 207Pb nuclear magnetic resonance (NMR) spectroscopy. It is based on ab initio calculations performed on an isolated tetramethyllead Pb(CH3)4 molecule and the assignment of the experimental resonance frequency from the gas-phase NMR spectra of Pb(CH3)4, extrapolated to zero density of the buffer gas to obtain the result for an isolated molecule. The computed207Pb shielding constant is 10 790 ppm for the isolated molecule, leading to a shielding of 10799.7 ppm for liquid Pb(CH3)4 which is the accepted reference standard for 207Pb NMR spectra. The new experimental and theoretical data are used to determine μ(207Pb), the nuclear magnetic dipole moment of 207Pb, by applying the standard relationship between NMR frequencies, shielding constants and nuclear moments of two nuclei in the same external magnetic field. Using the gas-phase 207Pb and (reference) proton results and the theoretical value of the Pb shielding in Pb(CH3)4, we find μ(207Pb) = 0.59064 μN. The analysis of new experimental and theoretical data obtained for the Pb2+ ion in water solutions provides similar values of μ(207Pb), in the range of 0.59000–0.59131 μN.
Publisher
Royal Society of Chemistry
Citation
Adrjan, Makulski, Jackowski K, Demissie TB, Ruud K, Antušek, Jaszuński M. NMR absolute shielding scale and nuclear magnetic dipole moment of 207 Pb. Physical Chemistry, Chemical Physics - PCCP. 2016;18(24):16483-16490
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