Synthesis under high pressure: crystal structure and properties of cubic DyOF[AsO] ∙ HO.

The multi-anionic compound with the composition DyOF[AsO] ∙ HO, which can be described in the non-centrosymmetric cubic space group , already shows an unusually large unit cell with an axis of = 2587.59(14) pm. Its crystal structure exhibits isolated ψ-tetrahedral [AsO] anions, but both the coordination numbers and the linking schemes of the Dy-centered polyhedra differ significantly from the mostly layered structures described so far in literature.