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- W2071522276 abstract "The decondensation of the Mo7O246− ion was studied with a Durrum-Gibson stopped-flow spectrophotometer at 25 °C in NaCl as supporting electrolyte medium and ionic strength held constant at 3. The kinetic study of the fast reaction of paramolybdate ion and anionic monocharged base, B, Mo7O246− + 8B + 4H2O → 7MoO42− + 8HB+ shows that the slow step of the decondensation is the simultaneous attack of Mo7O246− by B and water. This step is followed by rapid reactions of neutralisation unobservable in our experimental conditions. The rate law can be written rate = {kw [H2O]+ kB [B]} [Mo7O246−]. For strong bases such as OH−, C6H5O− and NH3CH2CO2− the water hydrolysis is negligible in the rate limiting step and the reaction appears to be second order, first order in the polyanion and first order in the base and a SN2 mechanism is conceivable. The rate constant, kB, increases with the strength of the base (or its nucleophilic reactivity). For weak bases which have pKa near 5 such as CH3CO2− C(CH3)3CO2− and C6H5CO2− the decondensation is slower. The concentration and the nature of the base have no influence on the kinetic law. The reaction appears to be first order in Mo7O246−. Thus, it is reasonable to assume that the attack on Mo7O246− is due only to water." @default.
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- W2071522276 date "1974-05-01" @default.
- W2071522276 modified "2023-09-27" @default.
- W2071522276 title "Stopped flow spectrophotometric study of paramolybdate decondensation rate with different bases" @default.
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- W2071522276 doi "https://doi.org/10.1016/0022-5088(74)90090-3" @default.
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