An X-ray diffraction study on the structures of mono(glycinato)copper(II) and tris(glycinato)cuprate(II) complexes in aqueous solution.
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概要
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The structures of mono(glycinato)copper(II) and tris(glycinato)cuprate(II) complexes in solution were determined by means of X-ray diffraction at 20 °C. The radial distribution curve obtained for solution A, in which comparable amounts of hexaaqua- and mono(glycinato)copper(II) complexes coexisted (the mole ratio <I>C</I><SUB>gly</SUB>⁄<I>C</I><SUB>Cu</SUB>=0.700, where <I>C<SUB>i</SUB></I> represents the total concentration of species <I>i</I>), showed that the mono(glycinato)copper(II) complex combined with four water molecules, two of which were at the distance of (1.98±0.01) Å at the equatorial position and the other two were of (2.27±0.01) Å at the axial one. The equatorial Cu–OH<SUB>2</SUB> bond length within the mono(glycinato)copper(II) was longer than that within the hexaaquacopper(II) ion (1.94 Å), whereas the axial Cu–OH<SUB>2</SUB> bond distance within the former complex was shorter than that within the latter (2.43 Å). Both lengths of the Cu–O and Cu–N bonds within the mono(glycinato)copper(II) ion were (1.99±0.02) Å. Thus the [Cu(gly)(OH<SUB>2</SUB>)<SUB>4</SUB>]<SUP>+</SUP> complex has an axially elongated octahedral structure. The X-ray scattering data of solution B with the <I>C</I><SUB>gly</SUB>⁄<I>C</I><SUB>Cu</SUB> mole ratio of 13.7, in which almost all Cu(II) ions formed the tris(glycinato)cuprate(II) complex were well explained in terms of a regular octahedral structure of the complex having the same Cu–O and Cu–N bond distances of (2.02±0.01) Å. The structure of the bis(glycinato)copper(II) complex was not determinable owing to its low solubility.
- 公益社団法人 日本化学会の論文
著者
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Ohtaki Hitoshi
Department Of Chemistry Faculty Of Science And Engineering Ritsumeikan University
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Ozutsumi Kazuhiko
Department Of Applied Chemistry College Of Life Sciences Ritsumeikan University
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