Abstract
The dimerisation of monomeric molybdenum(VI) has been investigated spectrophotometrically at perchloric acid concentrations 0.5, 1.0, 2.0 and 3.0 M in 3.0 M (Na)ClO 4 medium at 25°C. Equilibrium analysis of the data shows that three dimeric species, formulated as Mo 2O(OH) 9H 2O +, Mo 2O(OH) 8(H 2O) 2 2+ and Mo 2O(OH) 7(H 2O) 3 3+, are formed under the experimental conditions. The equilibrium constant for the dimerisation of Mo(OH) 5(H 2O) + to Mo 2O(OH) 8(H 2O) 2 2+ is K d = 97 ± 15. The values of the protonation constants of the ions Mo 2O(OH) 9(H 2O) + and Mo 2O(OH) 8(H 2O) 2 2+ are K 2 = 4.7 ± 2.0 and K 3 = 0.24 ± 0.07, respectively.
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