Chemical Reactivity and Electronic Structure Theory

Chemical reactivity is governed by the distribution and motion of electrons within molecules and materials, a domain described by electronic structure theory. At its core, this framework seeks to relate quantum-mechanical descriptions—wavefunctions or electron densities—to observable reaction outcomes. Modern approaches emphasise density functional theory (DFT), which maps the many-body problem onto a functional of the electron density, enabling both energetic predictions and conceptual descriptors of reactivity. These descriptors—electronegativity, hardness, polarizability and local functions such as the Fukui function—provide insight into activation barriers, selectivity and mechanism across diverse reaction classes. Integrating these tools into automated workflows and data-driven platforms has broadened the predictive power of computational chemistry, accelerating catalyst design, enantioselective synthesis and retrosynthetic planning. The coupling of fundamental theory with practical applications underpins advances in materials science, pharmaceutical development and sustainable chemical processes, emphasising the global importance of linking electronic structure to chemical behaviour.

Research from Nature Portfolio

Recent studies have highlighted the critical role of electronic polarizability in stereochemical control of catalytic transformations. By quantifying local substrate polarizabilities, researchers have established linear free energy relationships that accurately predict enantio-selectivity in asymmetric hydrogenations and oxidations. This polarizability-derived model complements steric factors to guide rational catalyst design. In parallel, a revised thermochemical electronegativity scale has been introduced, replacing traditional units with dimensionless values that exhibit more intuitive periodic trends and improve predictions of bond polarity and reaction energetics. This refined scale enhances the understanding of bond formation across the entire periodic table and informs both molecular and solid-state chemistry.

Chemical Reactivity and Electronic Structure Theory publication trend

The graph below shows the total number of articles in chemical reactivity and electronic structure theory across all publications each year (not limited to Nature Index journals).

Technical terms

Density functional theory (DFT): A quantum-mechanical approach that models electronic energy as a functional of the electron density, facilitating computational efficiency and conceptual analysis.

Polarizability: The tendency of an electron cloud to distort under an external electric field, influencing intermolecular interactions and stereochemical outcomes.

Electronegativity: A measure of an atom’s or group’s ability to attract electrons, central to predicting bond polarity and reaction driving forces.

Nucleophilicity: The propensity of a site to donate electron density to an electrophile, determining rates and pathways in bond-forming reactions.

Electrophilicity: The tendency of a species to accept electron density, guiding predictions of reactivity with nucleophilic partners.

Fukui function: A local response descriptor derived from changes in electron density upon addition or removal of electrons, used to identify reactive sites.

Chemical hardness: A measure of resistance to change in electron distribution, reflecting stability and selectivity according to the hard-soft acid-base principle.

References

1. Polarizability matters in enantio-selection. Nature Communications (2024).
2. Thermochemical electronegativities of the elements. Nature Communications (2021).
3. Hard and soft electrons and holes. Chem (2024).
4. Automated quantum chemistry for estimating nucleophilicity and electrophilicity with applications to retrosynthesis and covalent inhibitors. Digital Discovery (2024).
5. Density functional theory, chemical reactivity, and the Fukui functions. Foundations of Chemistry (2022).