Abstract
It is well established that the σ-bond in the elemental halogens is weak. It is likewise weak in peroxides, disulfides, interhalogens, noble gas monohalide cations, and other isoelectronic species. This is normally explained in terms of lone pair–lone pair repulsion. Other explanations are given as well.
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Bent, H.A., Liebman, J.F. Paradigms and paradoxes: the weak bonds in elemental halogens, peroxides, disulfides, interhalogens, noble gas monohalide cations, and isoelectronic species. Struct Chem 22, 371–372 (2011). https://doi.org/10.1007/s11224-010-9726-3
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DOI: https://doi.org/10.1007/s11224-010-9726-3