Synthesis and characterization of 18-molybdopyrophosphate complex.
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概要
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The existence of a heteropoly 18-molybdopyrophosphate was ascertained in both solid and solution states. The yellow complex was formed in solutions of 0.05 M (M=mol dm<SUP>−3</SUP>) Mo(VI)/5×10<SUP>−3</SUP> M pyrophosphate/0.1–0.7 M HCl/60% (v/v) CH<SUB>3</SUB>CN at ambient temperatures, being isolated as tetraalkylammonium (R<SUB>4</SUB>N<SUP>+</SUP>) salts where R=<I>n</I>-C<SUB>4</SUB>H<SUB>9</SUB> and C<SUB>2</SUB>H<SUB>5</SUB>. The presence of organic solvents was essential for the preparation of the complex. The 18-molybdopyrophosphate complex underwent a four-step reduction in 95% (v/v) CH<SUB>3</SUB>CN–water containing 0.1 M HClO<SUB>4</SUB>, yielding mixed-valence blue species by the electrochemical reduction at the respective steps of a reversible two-electron transfer. The heteropoly skeleton is retained in the blue complexes. The UV-visible and IR spectroscopic characteristics, and the formation conditions of the 18-molybdopyrophosphate complex were also elucidated.
- 公益社団法人 日本化学会の論文
著者
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Himeno Sadayuki
Department Of Chemistry Faculty Of Science Kobe University
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Saito Atsuyoshi
Department Of Chemistry Faculty Of Science Kobe University
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Hori Toshitaka
Department of Chemistry, College of Liberal Arts and Sciences, Kyoto University
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