Molecular Electrostatics and Intermolecular Interactions

Molecular electrostatics underpins the forces that govern how molecules approach, recognise and bind one another. At its core lies the distribution of charge within a molecule, which creates regions of relative positive and negative potential. These regions guide attractive and repulsive forces such as hydrogen bonding, dipole–dipole interactions, ion–dipole attractions and van der Waals contacts. A detailed understanding of these interactions is essential across chemistry and materials science: from predicting the stability of pharmaceutical co-crystals, to designing selective sensors and optimising energy storage devices. Advances in computational methods, particularly density functional theory and topological analysis of electrostatic potential, enable the mapping of electron-deficient and electron-rich sites, revealing how subtle changes in substituents or scaffold geometry modulate binding affinities, reaction barriers and macroscopic properties such as solubility or conductivity. The integration of experimental and theoretical approaches now allows researchers to tailor intermolecular landscapes for applications as diverse as drug design, catalysis and next-generation battery materials.

Research from Nature Portfolio

Recent computational studies have dissected how substituents on stable radical frameworks influence proton affinities and hydrogen-bond strengths. By combining natural bond orbital and atoms-in-molecules analyses, researchers have shown that electronic delocalisation around nitroxide centres dictates not only gas-phase basicities but also planar hydrogen-bond energies with water. These insights refine predictive models for radical stability and reactivity under varying environments. In parallel, first-principles investigations into atom-doped polycyclic aromatic nanoflakes have demonstrated that replacing carbon atoms with heteroatom pairs significantly deepens the electrostatic potential minima, strengthening cation adsorption. Such work predicts high lithium-ion binding energies and elevated cell voltages when these nanoflakes serve as anode materials, pointing to new routes for engineering electrode surfaces with tailored charge landscapes.

Molecular Electrostatics and Intermolecular Interactions publication trend

The graph below shows the total number of articles in molecular electrostatics and intermolecular interactions across all publications each year (not limited to Nature Index journals).

Technical terms

Molecular Electrostatic Potential (MESP): A scalar field representing the potential energy of a unit positive charge at points around a molecule, indicating regions prone to electrophilic or nucleophilic attack.

Hydrogen Bond: An attractive interaction between a hydrogen atom bonded to an electronegative donor (e.g. N, O) and an electronegative acceptor region, crucial for molecular recognition and assembly.

Dipole Moment: A vector quantity measuring the separation of positive and negative charges within a molecule, influencing orientation and interaction strength under electric fields.

Polarizability: The ease with which a molecule’s electron cloud is distorted by an external electric field, affecting dispersion forces and dielectric response.

Proton Affinity: The negative of the enthalpy change when a proton binds to a base in the gas phase, reflecting intrinsic basicity and influencing solvation and reactivity.

References

1. Computational analysis of substituent effects on proton affinity and gas-phase basicity of TEMPO derivatives and their hydrogen bonding interactions with water molecules. Scientific Reports (2024).
2. Density functional theory study of doped coronene and circumcoronene as anode materials in lithium-ion batteries. Scientific Reports (2024).
3. Electrostatic Potential Topology for Probing Molecular Structure, Bonding and Reactivity. Molecules (2021).
4. DFT Studies of Selected Epoxies with Mesogenic Units–Impact of Molecular Structure on Electro-Optical Response. International Journal of Molecular Sciences (2021).