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Structure of Ni(II)– and Zn(II)–Glycinato Complexes in Aqueous Solution Determined by EXAFS Spectroscopy

1985; Oxford University Press; Volume: 58; Issue: 10 Linguagem: Inglês

10.1246/bcsj.58.2786

1348-0634

Kazuhiko Ozutsumi, Toshio Yamaguchi, Hitoshi Ohtaki, Kazuyuki Tohji, Yasuo Udagawa,

Electrochemical Analysis and Applications

Abstract The EXAFS spectroscopy has been used to determine the structure of the bis(glycinato) complexes of nickel(II) and zinc(II) ions of low solubility (0.1–0.3 mol dm−3) in aqueous solution. The structural parameters were evaluated by the least-squares analysis both in the reciprocal and in the real spaces on the basis of various standard samples of known structures. Analysis of the EXAFS spectra of aqueous solutions containing the bis(glycinato) complexes of nickel(II) and zinc(II) ions has revealed that both complexes have two additional water molecules bound to the central metal ions to complete the octahedral structure. The structure of the nickel(II) complex is similar both in crystals and in solution, whereas the bis(glycinato)zinc(II) in solution is coordinated with two water molecules instead of two neighboring glycinato carbonyl oxygen atoms in the solid state.