Ammonium cerium(IV) sulfate is an inorganic compound with the formula (NH<sub>4</sub>)<sub>4</sub>Ce(SO<sub>4</sub>)<sub>4</sub>÷2H<sub>2</sub>O. It is an orange-colored solid. It is a strong oxidant, the potential for reduction is about +1.44V. Cerium(IV) sulfate is a related compound.
A crystallographic study shows that the compound contains the Ce<sub>2</sub>(SO<sub>4</sub>)<sub>8</sub><sup>8âÂÂ</sup> anion, where the cerium atoms are 9 coordinated by oxygen atoms belonging to sulfate groups, in a distorted tricapped trigonal prism. The compound is thus sometimes formulated as (NH<sub>4</sub>)<sub>8</sub>[Ce<sub>2</sub>(SO<sub>4</sub>)<sub>8</sub>]÷4H<sub>2</sub>O.