Coordination Chemistry of Polyoxomolybdates: The Structure of a Dodecanuclear Molybdate Cage Incorporating Hydrogen Squarate Ligands, [(C₄H₉)₄N]₄ [Mo₁₂O₃₆(C₄O₄H)₄] · 10Et₂O

Unusual in the polyoxometalate 1 are the hydrogen squarate ions and the presence not only of edge‐sharing but also corner‐sharing octahedra. An identification of the protonated sites was not possible, but an elemental analysis and the IR spectrum unequivocally confirm the presence of protons. Crystals of the Bu₄N‐salt of 1, which crystallizes with ten Et₂O molecules per formula unit, readily lose two of the Et₂O molecules; therefore the X‐ray structure analysis had to be carried out in the presence of mother liquor. (Figure Presented.)