A compound, (o2)+(ptf6)−, important historically as a precursor of the first noble gas compound.

Hexafluorosilicic acid is the chemical compound with the formula H2SiF6. Hexafluorosilicic acid refers to an equilibrium mixture with hexaflurorosilicate anion (SiF62−) in an aqueous solution or other solvents that contain strong proton donors[1] at low pH.

Xenon hexafluoroplatinate is the name of the product of the reaction of platinum hexafluoride and xenon, in an experiment that proved the chemical reactivity of the noble gases. This experiment was performed by Neil Bartlett at the University of British Columbia, who formulated the product as "Xe+[PtF6]−", although subsequent work suggests that