A Zr-added Dawson-type poly(polyoxometalate).

A novel Zr-added trimer, [HN(CH)]H[(ZrPWO)]·7HO (1), has been made under hydrothermal conditions, and contains the highest number of Zr centers in known Dawson-type poly(POM)s. A remarkable feature of this study is the first discovery of a new type of divacant [α-5,10-PWO] fragment, which assembles with Zr ions to form a cyclic trimer. Furthermore, 1 as a heterogeneous catalyst exhibits high activity for the selective oxidative degradation of a sulfur mustard simulant CEES.