Tetraaquacobalt(II) bis[vanadyl(IV) phosphate], [Co(H(2)O)(4)][VO(PO(4))](2).

The structure of [Co(H(2)O)(4)][VO(PO(4))](2) is composed of [VO(PO(4))] layers and interlayer tetrahydrated Co(2+) ions. Alternating VO(5) square pyramids and PO(4) tetrahedra share O-atom vertices, thus forming the vanadyl phosphate layers. Two vanadyl oxo groups from neighbouring layers are coordinated to each Co atom in a trans fashion, with Co-O distances of 2.