Electrochemical study of isopoly and heteropoly anion transfer across the water | nitrobenzene interface. Part II. Vanadium-containing heteropolytungstate anions |
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Authors: | Hanming Wang Zemu Yu Enbo Wang Erkang Wang |
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Abstract: | The electrochemical transfer behaviour of vanadium-containing heteropolytungstate anions [PW12−xVxO40](3+x)− (x = 1−4) across the water | nitrobenzene interface has been investigated by cyclic voltammetry and chronopotentiometry with cyclic linear current scanning. The transfer of PW11V1O4−40, HPW10V2O4−40, H2PW10V2O3−40, H3PW9V3O3−40 and H4PW8V4O3−40 across the water | nitrobenzene interface can be observed within the potential window. The effects were observed of pH in the water phase on the transfer behaviour and the formation of vanadium-containing heteropolytungstate anions in solution. Heteropolytungstate anions become more stable due to their involving the vanadium atom. The degree of protonation and the dissociation constant of the trivalent vanadium-containing heteropolytungstate anion of protonation increase with increasing vanadium content. The transfer processes are diffusion-controlled. The standard transfer potential, the standard Gibbs energy and the dissociation constant for vanadium-containing heteropolytungstate anions have been obtained and the transfer mechanisms are discussed. |
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Keywords: | Isopoly anions Heteropoly anions Water | nitrobenzene interface |
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