Lewis adduct

Ammonia gives a pair of electrons to boron trifluoride, making a Lewis adduct. The acid part's shape and bond lengths change when the adduct forms.

In chemistry, specifically the Lewis acid-base theory, a Lewis adduct is the result of a Lewis base sharing a pair of electrons with a Lewis acid.[1]

Lewis adducts have a special type of chemical bond called a dipolar bond: where most covalent bonds are thought of as having one electron from each atom, in a Lewis adduct, both of the electrons come from one side (the base). The atoms in the dipolar bond have opposite formal charges.

References

  1. ↑ IUPAC, Compendium of Chemical Terminology, 5th ed. (the "Gold Book") (2025). Online version: (2006–) "Lewis adduct". doi:10.1351/goldbook.L03510
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