Absorption spectra of tetrahedral Co(III) and Co(II) complexes in heteropolytungstates.
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概要
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The absorption spectra of Co(III) and Co(II) in the single crystals of the Keggin-structure compounds, K<SUB>5</SUB>[Co<SUP>III</SUP>W<SUB>12</SUB>O<SUB>40</SUB>]·<I>n</I>H<SUB>2</SUB>O and K<SUB>6</SUB>[Co<SUP>II</SUP>W<SUB>12</SUB>O<SUB>40</SUB>]·<I>m</I>H<SUB>2</SUB>O, have been measured at 77 K. The spectra of these complexes in aqueous solutions have also been observed. All the spectra have been interpreted using crystal-field theory by assuming that a Co(III) or Co(II) ion is in T<SUB>d</SUB> symmetry. The parameters, <I>D</I><SUB>q</SUB>, <I>B</I>, and <I>C</I>⁄<I>B</I> can be evaluated as 780 cm<SUP>−1</SUP>, 630 cm<SUP>−1</SUP>, and 4.7 respectively for the Co(III) complex, and 460 cm<SUP>−1</SUP>, 650 cm<SUP>−1</SUP>, and 4.5 respectively for the Co(II) complex.
- 公益社団法人 日本化学会の論文
著者
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Kojima Kazuo
Department Of Applied Chemistry College Of Life Sciences Ritsumeikan University
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Matsuda Jiro
Department of Chemistry, Faculty of Science and Engineering, Ritsumeikan University
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