The structure of cerium(IV) bis(phosphite), Ce(HPO 3 ) 2 , has been solved by single-crystal X-ray diffraction and has trigonal (P3m1) symmetry. The cerium(IV) cation exhibits site symmetry 3m. and is octahedrally coordinated by O atoms of the phosphite ligands (point group symmetry 3m.). The highly symmetrical compound has a layered structure parallel to the ab plane, and is closely related to zirconium(IV) bis(phosphite) solved via powder X-ray diffraction with trigonal (P3) symmetry. Structural details of the two compounds are comparatively discussed.
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