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Structures of large POM structures A–C, with average diameters of 2.2, 2.5, and 3.4 nm, respectively (estimated from single crystal data with cations omitted by encapsulating each structure with an ellipsoid). [Metal oxide units represented as polyhedral; light-purple polyhedra, {WO6}; yellow polyhedra, pentagonal unit {(WO7)W4}; cyan spheres, W; blue spheres, Se; light-purple spheres, O; red spheres, disordered O and Cl; pink and dark-green spheres, heterometal ions.].
