Nuclear shieldings with the SSB-D functional.

Area of Science:

• Computational chemistry
• Quantum chemistry
• Spectroscopy

Background:

• The accurate calculation of nuclear magnetic resonance (NMR) shielding constants is crucial for molecular structure elucidation.
• The development of reliable and efficient computational methods is an ongoing challenge in theoretical chemistry.
• The SSB-D functional, a recent advancement, is evaluated for its performance in predicting NMR properties.

Discussion:

• The study assesses the SSB-D functional against established methods including PBE, OPBE, KT2, and CCSD(T).
• Performance is benchmarked across diverse molecular databases containing various nuclear shielding constants.
• Emphasis is placed on evaluating accuracy for hydrogen-1 (1H) and carbon-13 (13C) nuclei, which are most frequently observed in NMR experiments.

Key Insights:

• The SSB-D functional demonstrates competitive accuracy for calculating NMR shielding constants, particularly for 1H and 13C.
• Its performance is comparable to the specialized KT2 functional and superior to its parent functionals (PBE, OPBE) for these key elements.
• This suggests SSB-D is a promising tool for routine NMR shielding constant calculations.

Outlook:

• Further investigation into the performance of SSB-D for heavier or less common nuclei is warranted.
• Exploring the application of SSB-D in predicting other NMR parameters, such as spin-spin coupling constants, could be beneficial.
• The findings support the broader adoption of SSB-D in computational chemistry workflows for NMR spectroscopy analysis.