Layer apparent: Crystalline cerium(IV) phosphates have been studied for a long time as ion exchangers, but their structures have remained unknown. The structure of a cerium(IV) phosphate has been determined (see picture: tetrahedra PO4, yellow Ce, blue O (water)) and clearly explains a notable feature of this compound, its inability to intercalate amines. The X‐ray study is supported by solid‐state NMR spectroscopy investigations.
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