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Toy Models Reveal Intrinsic Biases in NICS: Insights to Verify NICS Interpretations
Emiel Vanden Berghe1, Patrick Bultinck1, Guillaume Acke1
1Department of Chemistry, Ghent University, Ghent, Belgium.
Journal of Computational Chemistry
|May 25, 2026
Summary
The nucleus-independent chemical shift (NICS) offers insights into magnetic aromaticity but can be misleading. Simplified models reveal NICS provides a biased view of current-density susceptibility, potentially causing misinterpretations of aromaticity.
Area of Science:
- Computational Chemistry
- Theoretical Chemistry
- Quantum Chemistry
Background:
- The nucleus-independent chemical shift (NICS) is a widely used index for assessing magnetic aromaticity in chemical systems.
- Interpreting NICS values relies on understanding the relationship between NICS and current-density susceptibility (J).
- Complex shielding-density patterns in molecules complicate the direct interpretation of NICS in relation to J.
Purpose of the Study:
- To investigate the intrinsic relationship between NICS and current-density susceptibility (J).
- To develop a method for separating intrinsic NICS behavior from aromaticity effects.
- To address the complexities hindering generalizable insights from NICS in molecular systems.
Main Methods:
- Introduction of simplified "toy models" to isolate the NICS-J relationship.
- Analysis of inherent features of the NICS-J interaction.
- Separation of intrinsic NICS properties from aromaticity contributions.
Main Results:
- NICS was found to reflect current-density susceptibility (J) in a manner that is inherently biased.
- This bias can lead to artifacts in NICS interpretations.
- Potential misinterpretations of magnetic aromaticity criteria due to NICS artifacts were identified.
Conclusions:
- Toy models provide a valuable framework for understanding the NICS-J relationship.
- The study establishes a foundation for verifying NICS interpretations against underlying current-density susceptibility.
- This approach is crucial for accurate assessment of magnetic aromaticity in molecular systems.
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