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- Title
Searching for the Best Values of NMR Shielding and Spin-Spin Coupling Parameters: CH 4-n F n Series of Molecules as the Example.
- Authors
Jackowski, Karol; Słowiński, Mateusz A.
- Abstract
Attempts at the theoretical interpretation of NMR spectra have a very long and fascinating history. Present quantum chemical calculations of shielding and indirect spin-spin couplings permit modeling NMR spectra when small, isolated molecules are studied. Similar data are also available from NMR experiments if investigations are performed in the gas phase. An interesting set of molecules is formed when a methane molecule is sequentially substituted by fluorine atoms—CH4-nFn, where n = 0, 1, 2, 3, or 4. The small molecules contain up to three magnetic nuclei, each with a one-half spin number. The spectral parameters of CH4-nFn can be easily observed in the gas phase and calculated with high accuracy using the most advanced ab initio methods of quantum chemistry. However, the presence of fluorine atoms makes the calculations of shielding and spin-spin coupling constants extremely demanding. Appropriate experimental 19F NMR parameters are good but also require some further improvements. Therefore, there is a real need for the comparison of existing NMR measurements with available state-of-the-art theoretical results for a better understanding of actual limits in the determination of the best shielding and spin-spin coupling values, and CH4-nFn molecules are used here as the exceptionally important case.
- Subjects
SPIN-spin coupling constants; AB initio quantum chemistry methods; CHEMICAL shift (Nuclear magnetic resonance)
- Publication
Molecules, 2023, Vol 28, Issue 3, p1499
- ISSN
1420-3049
- Publication type
Article
- DOI
10.3390/molecules28031499