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Updated: May 4, 2026

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
Published on: July 27, 2022
Spin-rotation and NMR shielding constants in HCl
Michał Jaszuński1, Michal Repisky2, Taye B Demissie2
1Institute of Organic Chemistry, Polish Academy of Sciences, 01-224 Warszawa, Kasprzaka 44, Poland.
Relativistic effects are crucial for accurate spin-rotation constants in hydrogen chloride (HCl). Including these effects improves agreement between theoretical and experimental nuclear magnetic shielding constants and magnetic dipole moments.
Area of Science:
- Quantum Chemistry
- Spectroscopy
- Computational Physics
Background:
- Accurate calculation of molecular properties requires considering relativistic effects.
- Previous studies on HCl have not fully incorporated relativistic corrections for spin-rotation and shielding constants.
Purpose of the Study:
- To calculate spin-rotation and nuclear magnetic shielding constants for HCl.
- To investigate the necessity of relativistic effects for accurate theoretical predictions.
- To establish an absolute nuclear magnetic shielding scale for HCl.
Main Methods:
- Nonrelativistic ab initio calculations at the Coupled Cluster Singles Doubles with Perturbative Triples (CCSD(T)) level.
- Inclusion of relativistic corrections in the calculations.
- Gas-phase Nuclear Magnetic Resonance (NMR) spectroscopy for experimental validation.
Main Results:
- Relativistic effects are essential for spin-rotation constants matching experimental data.
- Calculated spin-rotation constants for (1)H(35)Cl: CCl = -53.914 kHz, C(H) = 42.672 kHz.
- Computed nuclear magnetic shielding constants: σ(Cl) = 976.202 ppm, σ(H) = 31.403 ppm.
- Improved accuracy of magnetic dipole moments for chlorine isotopes.
Conclusions:
- Relativistic effects significantly impact spin-rotation and shielding constants in HCl.
- The study provides a new absolute shielding scale for chlorine.
- Theoretical calculations combined with experimental data enhance the understanding of molecular magnetic properties.
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