- 著者
-
Himeno Sadayuki
Hori Toshitaka
Saito Atsuyoshi
- 出版者
- 公益社団法人 日本化学会
- 雑誌
- Bulletin of the Chemical Society of Japan
- 巻号頁・発行日
- vol.62, no.7, pp.2184-2188, 1989
- 被引用文献数
-
42
The formation conditions of a yellow Dawson-type S<SUB>2</SUB>Mo<SUB>18</SUB>O<SUB>62</SUB><SUP>4−</SUP> anion have been investigated as functions of the concentrations of Mo(VI), H<SUB>2</SUB>SO<SUB>4</SUB>, organic solvents, the nature of the organic solvents used, temperature of the solution, and the reaction time. For a 50 mM Mo(VI)/50% (v/v) acetonitrile system, the yellow S<SUB>2</SUB>Mo<SUB>18</SUB>O<SUB>62</SUB><SUP>4−</SUP> anion formed in 0.2–1.0 M H<SUB>2</SUB>SO<SUB>4</SUB>, while a pale-yellow Mo<SUB>6</SUB>O<SUB>19</SUB><SUP>2−</SUP> anion did in 0.04–0.3 M H<SUB>2</SUB>SO<SUB>4</SUB>. The yellow heteropolyanion is electrochemically reduced in six successive steps to mixed-valence heteropoly blues at the glassy carbon electrode. Each of the first four waves corresponds to a reversible two-electron transfer. The mixed-valence blue species were characterized by their inherent visible and infrared (IR) spectra.