A hydrogen-bonded oxo-μ-bis[trans-nitrilotriacetato-cis-dioxotungstate(VI)] synthesized directly from an alkali tungstate and nitrilotriacetic acid

Potassium tungstate(VI) reacts with nitrilotriacetic acid in water to form tripotassium hydrogen oxo-μ-bis[trans-nitrilotriacetato-cis-dioxotungstate(VI)] dihydrate. The octahedrally coordinated tungsten atom is N,O,O-chelated by the nitrilotriacetate entity, which is linked by its acid hydrogen [O⋯O=2.54(2) Å] to form a chain that propagates along a diagonal of the b–c face of the monoclinic unit cell.