Abstract
The [As 2W 18U 3O 74] 12− complex is formed by the “self-assembly” reaction of WO 4 2 - , HAsO 4 2 - and UO 2 2 + (uranyl nitrate) ions in acidic media. The anion complex is isolated as the potassium salt and characterized by elemental analysis, IR, UV–Vis, and X-ray single crystal analysis. The complex contains an anion in which three UO 2 2 + ions are unsymmetrically sandwiched between two A-α-[AsW 9O 34] 9− groups leading to a structure of C 3v symmetry. Each uranium atom adopts pentagonal-bipyramidal coordination, achieved by three equatorial bonds to one [AsW 9O 34] 9−and two bonds to the other. The [As 2W 18U 2V 2O 73] 12−and also [As 2W 18U 3O 74] 12− complexes are formed also, by reaction of the [KAs 2W 18U 2O 72] 13− with VO 2+ and UO 2 2 + ions in 1:1 mole ratio. The cyclic voltammogram of [As 2W 18U 2VO 73] 12− in acetate buffer (pH 4.7) shows a reversible one-electron redox process for V IV/V couple at +0.396 ( E pc) and +0.432 V ( E pa).
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