In this region of sub two-electron bonds, there is much scope for a continuum of interactions, ranging from "strong" to "weak". The example identified in this article might be classified as of the weak non-covalent interaction type, as revealed by an NCI (non-covalent-interaction) analysis. See DOI: https://doi.org/10.59350/xp5a3-zsa24 for this analysis. Model one-electron bonds formed from e.g. hexafluoroethane and ethane itself have much shorter C-C bonds, down to 1.93A for the latter, and appear to be closer to the covalent bond type than the interaction type. This is supported by the properties of the electron density Laplacian. See DOI: https://doi.org/10.59350/88k04-2x509 Thus the one-electron C-C bond can apparently sustain lengths differing by as much as ~1Å, a much larger variation than any higher electron C-C bonds.
In this region of sub two-electron bonds, there is much scope for a continuum of interactions, ranging from "strong" to "weak". The example identified in this article might be classified as of the weak non-covalent interaction type, as revealed by an NCI (non-covalent-interaction) analysis. See DOI: https://doi.org/10.59350/xp5a3-zsa24 for this analysis. Model one-electron bonds formed from e.g. hexafluoroethane and ethane itself have much shorter C-C bonds, down to 1.93A for the latter, and appear to be closer to the covalent bond type than the interaction type. This is supported by the properties of the electron density Laplacian. See DOI: https://doi.org/10.59350/88k04-2x509 Thus the one-electron C-C bond can apparently sustain lengths differing by as much as ~1Å, a much larger variation than any higher electron C-C bonds.