What question did this study set out to answer?

To investigate direct evidence for a carbon–carbon one-electron σ bond and its possible alternative interpretations.

June 10, 2026ChemistryOpenOpen Access

Direct Evidence for a Carbon–Carbon One‐Electron σ‐Bond, or a Weak Carbon–Carbon Interaction?

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To investigate direct evidence for a carbon–carbon one-electron σ bond and its possible alternative interpretations.
Conducted single-crystal X-ray diffraction analysis to obtain structural data.
Used electron density maps and RAM spectroscopy for analytical support.
Discussed theoretical perspectives from density functional theory regarding bonding interactions.
Found that the carbon–carbon distance was 2.921(3) Å, indicative of weak interactions rather than a clear σ bond.
Observed discrepancies between experimental measurements and theoretical models suggesting non-covalent interactions.
Highlighted similarities to previous studies to advocate for new theoretical investigations beyond traditional frameworks.

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Experimental findings question the existence of a carbon–carbon one-electron σ bond, suggesting weak interactions instead.

Zazza et al. (2026) studied this question.

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