What does this research mean for the field?

Chemical bonds in neutral molecules in their electronic ground state, including highly polarized bonds, originate fundamentally from the constructive interference of wave functions (covalent interaction) rather than classical electrostatic ionic interactions. Novelty: ClaimNovelty.CONTRADICTORY. Consensus alignment: ConsensusAlignment.CHALLENGES_CONSENSUS.

What question did this study set out to answer?

To investigate the physical mechanism driving chemical bond formation in nonpolar and polar neutral molecules in their electronic ground state.

August 22, 2026Journal of Chemical Theory and Computation

Chemical Bonds in Molecules Are Covalent but Not Ionic

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Authors

YLYahui LiJilin University CDChengxiang DingJilin University SPSudip PanJilin University

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Implication

Theoretical analysis reveals that ground-state molecular bonds stem from wave-function interference rather than electrostatic attraction, indicating isolated molecular bonds are covalent.

Key Points

To investigate the physical mechanism driving chemical bond formation in nonpolar and polar neutral molecules in their electronic ground state.
Analyzed bonding in nonpolar diatomics (H–H, Li–Li, F–F), polar diatomics (Li–H, H–F, Li–F, and EF/ECl where E = Na–Cs), and isoelectronic dications (HeNe²⁺, BeHe²⁺, BeNe²⁺).
Evaluated wave-function constructive interference, real-space quantum representations, Valence Bond models, and Quantum Theory of Atoms in Molecules (QTAIM) Laplacian distributions.
Bonding interactions in all investigated neutral ground-state molecules arise from constructive quantum interference (resonance) of neutral fragment wave functions, establishing that all such bonds are covalent regardless of polarity.
Classical electrostatic ionic interactions do not drive ground-state molecular bonding, applying instead to crystal lattices stabilized by Madelung factors, solvated ions, or specific long-range excited states.
The QTAIM Laplacian distribution ∇²ρ(r) fails as a reliable indicator for chemical bond formation mechanisms in polar molecules.

Cite This Study

Li et al. (2026) studied this question.

synapsesocial.com/papers/6a895fd3ca7ade938187ebc0 https://doi.org/10.1021/acs.jctc.6c01248

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Implication

Theoretical analysis reveals that ground-state molecular bonds stem from wave-function interference rather than electrostatic attraction, indicating isolated molecular bonds are covalent.

Chemical Bonds in Molecules Are Covalent but Not Ionic

Discussion

Member takes

Implication

Key Points

Cite This Study

Chemical Bonds in Molecules Are Covalent but Not Ionic

Discussion

Member takes

Implication

Key Points

Cite This Study

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