Abstract
The structure of cerium(IV) bis-(phosphite), Ce(HPO3)2, has been solved by single-crystal X-ray diffraction and has trigonal (P-3m1) symmetry. The cerium(IV) cation exhibits site symmetry -3m. and is octa-hedrally 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 (P-3 symmetry. Structural details of the two compounds are comparatively discussed.
Highlights
The structure of cerium(IV) bis(phosphite), Ce(HPO3)2, has been solved by single-crystal X-ray diffraction and has trigonal (P3m1) symmetry
According to IUPAC, when the hydrogen atom is directly bonded to the phosphorus atom, it is to be named phosphonate; whereas when the anion tautomerizes to the PO2(OH)2 anion, it is named as phosphite
While IUPAC prefers HPO32 to be named phosphonate, this name is used for organophosphorus compounds with the general formula R-PO(OH)2 or R-PO(OR)2, where R = alkyl or aryl groups
Summary
Phosphonates are commonly employed within the petroleum industry as antioxidants. Interactions between these antioxidants and possible metal impurities could potentially have unintended consequences in the processing of petroleum products. According to IUPAC, when the hydrogen atom is directly bonded to the phosphorus atom, it is to be named phosphonate; whereas when the anion tautomerizes to the PO2(OH) anion, it is named as phosphite. The latter ion is rarely identified in the solid state. The central phosphorus atom is PIII instead of the more air-stable PV, which provides the opportunity for redox chemistry This ability to act as a reducing agent has led to several mixed-valent uranium compounds These sheets are layered down the c axis, where each cerium(IV) atom resides directly below the cerium above it at a distance of 5.6099 (3) Å, which corresponds to the length of
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