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Relativistic effects on group-12 metal nuclear shieldings
Juho Roukala1, Alejandro F Maldonado, Juha Vaara
1NMR Research Group, Department of Physics, University of Oulu, P.O. Box 3000, FIN-90014, Finland.
Breit-Pauli perturbation theory (BPPT) accurately calculates relativistic effects on nuclear magnetic shielding for heavy elements like mercury. This method is efficient for predicting chemical shifts in heavy-element systems.
Area of Science:
- Computational chemistry
- Quantum chemistry
- Relativistic effects
Background:
- Relativistic effects significantly influence nuclear magnetic shielding in heavy elements.
- Perturbation theory offers an economical approach to calculating these effects.
- Accuracy can decrease with increasing atomic number in perturbative methods.
Purpose of the Study:
- To evaluate the performance of Breit-Pauli perturbation theory (BPPT) against four-component relativistic theory.
- To assess the accuracy of BPPT for nuclear shielding constants and chemical shifts in group-12 metals (Zn, Cd, Hg).
- To identify key BPPT correction terms contributing to relativistic corrections.
Main Methods:
- Comparison of BPPT with fully relativistic four-component theory.
- Calculation of nuclear shielding constants and chemical shifts for Zn, Cd, and Hg complexes.
- Analysis of relativistic correction terms within BPPT.
Main Results:
- Five out of sixteen BPPT correction terms account for the majority of relativistic corrections to chemical shifts.
- Relativistic effects are significant for Cadmium (Cd).
- BPPT demonstrates good performance for Mercury (Hg) chemical shifts when compared to the fully relativistic method.
Conclusions:
- BPPT is a reliable and efficient method for calculating relativistic effects on chemical shifts in heavy-element systems, particularly up to Mercury.
- Understanding the contribution of individual correction terms enhances the analysis of relativistic effects.
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