Electron spin resonance and some spectral studies on coordination behaviors of paramagnetic metal ions for chelation resins.

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概要

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• Coordination behaviors of VO(II), Cr(III), Mn(II), Fe(III), Cu(II), and Gd(III) ions for the iminodiacetato group in the chelating ion-exchange resin Dowex A-1 were studied with the aid of ESR, infrared absorption, and M\ddotossbauer spectroscopies. A comparative investigation also was made with the <I>o</I>-hydroxybenzyliminodiacetato group in the chelating resin Unicellex UR-50. The iminodiacetato group in Dowex A-1 is considered to coordinate as a tridentate ligand and form 1 : 1 chelates with metal ions, whereas the <I>o</I>-hydroxybenzyliminodiacetato group in Unicellex UR-50 coordinates as a quadridentate ligand in alkaline media and forms 1 : 1 chelates. Elucidation of spin-spin exchange interaction has led to a conclusion that the iminodiacetato groups present in the coordination pore of Unicellex UR-50 are closer to one another than those of Dowex A-1. For Fe(III) ions adsorbed in concentrated HCl media, besides the species [FeCl<SUB>4</SUB>]<SUP>−</SUP>, lower symmetric species are considered to be adsorbed with the anion exchange effect, from results of resin phase ESR and Mössbauer spectra.

• 公益社団法人 日本化学会の論文

著者

• NAKASHIMA Akira

  Department of Surgery, Division of Clinical Medical Science, Graduate School of Biomedical Sciences, Hiroshima University

• Isobe Toshiyuki

  Department of Chemistry, Faculty of Science, Kyushu University 33

• Tarutani Toshikazu

  Department of Chemistry, Faculty of Science, Kyushu University

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