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inorganic compounds
Crystals of the title compound, octaammonium dicerium octasulfate tetrahydrate, suitable for X-ray work, were prepared by a hydrothermal reaction. The structure is made up of [Ce2(SO4)8]8- anions, interacting with the crystallization waters and the NH4+ cations through hydrogen bonds. Cerium(IV) in the [Ce2(SO4)8]8- anion is ninefold coordinated by O atoms belonging to sulfate groups. The coordination polyhedron is a somewhat distorted tricapped trigonal prism. The Ce-O distances range from 2.325 (2) to 2.478 (2) Å.
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