A Novel Zirconium Polyoxometalate Complex That Contains Both a Coordinated Saturated Anion, [PMo₁₂O₄₀]^3-, and a Coordinated Unsaturated Anion, [PMo₁₁O₃₉]^7-

The novel 8-coordinate zirconium compound (NH4)6[Zr(PMo12O40)(PMo11O39)]·26H2O (1) has been synthesized and characterized by single-crystal X-ray diffraction, elemental analysis, and vibrational and 31P NMR spectroscopy. It is the first example of a metal complex containing both parent, [PMo12O40]3-, and monovacant lacunary, [PMo11O39]7-, anions. Furthermore, this is the first crystallographic determination of the [PMo11O39]7- anion.