The phase transfer mechanism of 12- and 18-molybdophosphate anions (Keggin- and Dawson-type structures) across the water/nitrobenzene interface |
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| Affiliation: | 1. Department of Chemistry, Hakim Sabzevari University, Sabzevar 96179-76487, Iran;2. Université de Lille Nord de France, USTL-ENSCL, Université Artois, Bat C7, BP 90108, 59652Villeneuve d''Ascq, France;1. National Engineering Technology Research Center for Colloidal Materials, Shandong University, Jinan 250100, PR China;2. Key Lab for Colloid and Interface Chemistry of Education Ministry, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, PR China |
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| Abstract: | The electrolytic transfer of 12- and 18-molybdophosphate anions across the water/nitrobenzene interface has been investigated by cyclic voltammetry (CV) and chronopotentiometry with cyclic linear current-scanning (CLC). The transfer behavior is very complicated due to the coupled chemical reactions occurring in the system. The transfer processes of heteropoly anions with a negative charge of 3 or 4 are determined by a set of rather obscure equilibria of dissociation and disproportionation, etc., and depend on pH as well as on the composition of the heteropoly anions. The stable forms and pH ranges of heteropoly anions can be confirmed directly through their voltammetric behavior. The experimental results show that an electrochemical study at the water/organic phase interface is very useful for monitoring the states of the heteropoly acids or salts in solution. |
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