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Vanadium phosphate : ウィキペディア英語版 | Vanadium phosphate
Vanadium phosphate is an inorganic compound with the formula VOxPO4 and related hydrates (x = 0 or 1). A common vanadium phosphate is VOPO4.2H2O. Four polymorphs are known for anhydrous VOPO4, denoted α, β, γ, δ. These materials are composed of the vanadyl group (VO) and phosphate (PO43-). They are yellow, diamagnetic solids, although when contaminated with vanadium(IV) derivatives, samples exhibit EPR signals and have bluish cast. For these materials, vanadyl refers to both vanadium(V) oxo and vanadium(IV) oxo centers, although conventionally vanadyl is reserved for derivatives of VO2+. ==Vanadium(IV) phosphates== Related compounds contain vanadium(IV), and are typically blue. In these species, the phosphate anion is singly or doubly protonated. Examples include the monohydrogenphosphates, VOHPO4.4H2O and VO(HPO4).0.5H2O, and the dihydrogen phosphate VO(H2PO4)2).
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