catena-Poly[2,2′,2′′-nitrilo­tris­(ethan­aminium) [tri-μ-oxido-tris­[dioxido­vanadate(V)]] monohydrate]

The title compound, {(C(6)H(21)N(4))[V(3)O(9)]·H(2)O}(n), crystallizes as a salt with [trenH(3)](3+) cations [tren is tris­(2-amino­eth­yl)amine], and one-dimensional anionic {[V(V)O(3)](−)}(n) (metavanadate) chains along the c-axis direction. Three crystallographically distinct V(V) sites and one occluded water mol­ecule are present for every [trenH(3)](3+) cation in the unit cell. The {[V(V)O(3)](−)}(n) chains are composed of vertex-sharing [VO(4)] tetra­hedra and have a repeat unit of six tetra­hedra. Each tetra­hedron in the chain contains two terminal and two μ(2)-bridging oxide ligands. The [trenH(3)](3+) cations, {[V(V)O(3)](−)}(n) anions and occluded water mol­ecules participate in an extensive three-dimensonal hydrogen-bonding network. The three terminal ammonium sites of the [trenH(3)](3+) cations each form strong N—H⋯O hydrogen bonds to terminal oxide ligands on the {[V(V)O(3)](−)}(n) chain. Each occluded water mol­ecule also donates two O—H⋯O hydrogen bonds to the terminal oxide ligands.