Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 23, Issue 1, Pages 339-346Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0cp06012g
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Funding
- National Science Foundation [CHE1855470]
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The behavior of the sodium anion has been found to interact strongly with its chemical environment, isolating the core from the surroundings and appearing as a free ion in NMR experiments.
The sodium anion (Na-) was once thought to behave like a 'genuine' anion, with both the [Ne] core and the 3s valence shell interacting very weakly with their environments. In the present work, following a recent study of the surprisingly small quadrupolar line widths of Na-, NMR shielding calculations were carried out for the Na-/Na+ [2.2.2]cryptand system solvated in methylamine, based on ab initio molecular dynamics simulations, followed by detailed analyses of the shielding constants. The results confirm that Na- does not act like a quasi-free ion that interacts only weakly with its surroundings. Rather, the filled 3s shell of Na- interacts strongly with its chemical environment, but only weakly with the ion's own core and the nucleus, and it isolates the core from the chemical environment. As a consequence, the Na- ion appears in NMR experiments like a free ion.
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