Difluorine complex
# Difluorine complex

A difluorine complex is a molecular complex involving a difluorine molecule $(F_2)$ and another molecule. The first example was gold heptafluoride $(AuF_7).$ Instead of being a gold(VII) compound, $AuF_7$ is an adduct of gold pentafluoride $(AuF_5)$ and $F_2.$ This conclusion has been repeatedly supported by calculations. Unlike dihydrogen complexes, which feature $η^2-H_2,$ difluorine complexes feature "end-on" or $η^1-F_2$ ligand.

