Fluoroantimonate
The fluoroantimonates are a family of polyatomic weakly coordinating anions composed of antimony and fluorine, consisting of the fluorine adducts of antimony pentafluoride, [(SbF5)nF]−. They occur in the internal chemistry of fluoroantimonic acid.
The most notable fluoroantimonates are hexafluoroantimonate [SbF6]− and undecafluorodiantimonate [Sb2F11]−. Both are used as components of ionic liquids and as weakly coordinating anions in the study of highly reactive cations.