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Abstract
The ammonium salt of [CoW11O38F2H4]6− has been isolated in the crystalline form. The X-ray powder patterns show that the anion has some similarity to the Keggin structure. Other evidence from elemental analyses, Fast Atom Bombardment Mass Spectroscopy (FABMS), infrared spectroscopy, ultraviolet-visible spectroscopy, and cyclic voltammetry lend support to the above formulation. The cobalt atom in the anion is thought to occupy the octahedral site vacated by the missing tungsten atom. FABMS shows that the formula weight of the anhydrous salt is 2839 da.