Abstract
Multiple bonding has fascinated chemist since its inception. Recently, genuine quadruple bond in AeF- (Ae = Be-Ba) has been proposed (Chem. Sci. 14 (2023) 4872–4887). The genuineness of such a quadruple bond is scrutinized here with electron localization function (ELF). ELF analysis reveals the presence of a disynptic Ae-F basin which integrates to <2.0 electrons, much lower than expected for quadruple bond. The presence of excess kinetic energy in the bonding basins makes these bonds a unique type called “Charge-Shift”.
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