Two New Isopolyoxotungstates(VI) with the Empirical Composition Cs2 W2 O7 ⋅2 H2 O and Na2 W2 O7 ⋅H2 O: An Icosatetratungstate and a Polymeric Compound.

The largest isopolyoxotunstate ion known to date, W24 O8424- (structure shown in the picture), isolated as the cesium salt, and a chainlike polyoxotungstate ion made up of planar W4 O16 units, isolated as the sodium salt, hide behind the simple empirical formulas of the title compounds.