Synthesis and structural study of tris­(2,6-di­amino­pyridinium) bis­(oxalato)dioxidovanadate(V) 2.5-hydrate

Crystals of the title compound, (C(5)H(8)N(3))(3)[VO(2)(C(2)O(4))(2)]·2.5H(2)O, a mononuclear V(V) complex, were obtained by slow evaporation at room temperature of an aqueous solution containing vanadium pentoxide, oxalic acid and 2,6-di­amino­pyridine. The asymmetric unit contains one bis­(oxalato)dioxovanadate(V) anionic complex, three 2,6-di­amino­pyridinium cations and two and a half uncoordinated water mol­ecules. The mononuclear vanadium(V) anions are connected to the organic cations and water mol­ecules through a strong N—H⋯O and O—H⋯O hydrogen-bond network, consolidated by π–π stacking inter­actions, to form a three-dimensional structure.