catena-Poly[[[(5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane-κ4N)nickel(II)]-μ-oxido-[dioxidotungstate(VI)]-μ-oxido] tetrahydrate]

In the title compound, {[NiWO4(C16H36N4)]·4H2O}n, the NiII ion lies on an inversion center and is octahedrally coordinated by four N atoms of the tetradentate macrocyclic 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane (L) ligand in the equatorial plane and two O atoms of [WO4]2− anions in axial positions. Each [WO4]2− anion bridges two adjacent [NiL]2+ cations, forming a chain along [001]. The chains are further connected via N—H...O, O—H...O and C—H...O hydrogen-bonding interactions, generating a three-dimensional structure