Quantum Chemical Interactions in Molecular Systems
Summary
Quantum chemical interactions lie at the heart of molecular structure, reactivity and function, encompassing both covalent bonding and a diverse array of noncovalent forces. Accurate description of these interactions demands incorporation of electron correlation effects, which govern dispersion, electrostatics and exchange contributions critical for predicting binding energies and conformational preferences. Advances in electronic‐structure theory, from density functional approaches to high‐level coupled‐cluster methods, have enabled rigorous energy decomposition and topology analyses of complex assemblies. Local correlation schemes permit tractable treatment of large biomolecules and materials, while quantum‐mechanical models of transition states unravel reaction pathways and isotopic effects. Such insights underpin rational design in drug discovery, catalysis and materials science, illuminating how subtle quantum effects translate into macroscopic properties and guiding the development of next‐generation functional systems.
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Quantum Chemical Interactions in Molecular Systems publication trend
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Technical terms
Electron correlation: The interaction between electrons beyond mean-field approximations, essential for accurately capturing dispersion and other noncovalent forces.
London dispersion: A weak attractive force arising from instantaneous fluctuations in electron density, significant in all molecular systems and critical for stability of complexes and materials.
Density functional theory (DFT): A computational quantum-mechanical method that describes electron density rather than wavefunctions to predict molecular properties with favourable cost–accuracy balance.
Domain-based local pair natural orbital coupled cluster (DLPNO-CCSD(T)): A wavefunction-based method that partitions electron correlation into localised pairs, reducing computational cost while retaining high accuracy for interaction energies.
Quantum Theory of Atoms in Molecules (QTAIM): A topological framework analysing the electron density to identify bond critical points and characterise interactions by energy‐density metrics.
Kinetic isotope effect (KIE): The change in reaction rate upon substitution of an atom by one of its isotopes, used to probe transition state structures and reaction dynamics.
References
- Local Energy Decomposition Analysis of London Dispersion Effects: From Simple Model Dimers to Complex Biomolecular Assemblies. Accounts of Chemical Research (2024).
- Inverse Versus Normal Behavior of Interactions, Elucidated Based on the Dynamic Nature with QTAIM Dual-Functional Analysis. International Journal of Molecular Sciences (2023).
- Modelling kinetic isotope effects for Swern oxidation using DFT-based transition state theory. Digital Discovery (2024).
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