Fe K-edge XANES and EXAFS of the X-ray absorption spectra of FeCl3 aqueous solutions. A structural study of the solute, iron(III) chloro complexes.

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概要

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• The Fe K-edge spectra were measured on FeCl<SUB>3</SUB> aqueous solutions by use of synchrotron radiation to reveal the solute structure from the analysis of Fe K-edge EXAFS and XANES. It is concluded that the solute exists mainly as [Fe(H<SUB>2</SUB>O)<SUB>6</SUB>]<SUP>3+</SUP> but partially as [FeCl(H<SUB>2</SUB>O)<SUB>5</SUB>]<SUP>3+</SUP> at FeCl<SUB>3</SUB> concentration of 0.1–1 mol dm<SUP>−3</SUP>, and it exsits mainly as [FeCl<SUB>2</SUB>(H<SUB>2</SUB>O)<SUB>4</SUB>]<SUP>+</SUP> at the concentration of 3–4 mol dm<SUP>−3</SUP>. In the diliquescent product of FeCl<SUB>3</SUB>, about a half of the solute is in the state of [FeCl<SUB>4</SUB>]<SUP>−</SUP> and the remaining half is likely to be in the state of [FeCl<SUB>2</SUB>(H<SUB>2</SUB>O)<SUB>4</SUB>]<SUP>+</SUP>. No indication was found for the dimer formation of FeCl<SUB>3</SUB> even in the deliquescent product.

• 公益社団法人 日本化学会の論文

著者

• Asakura Kiyotaka

  Department of Chemistry and Research Center for Spectrochemistry, Faculty of Science, The University of Tokyo

• Kuroda Haruo

  Department of Chemistry and Research Center for Spectrochemistry, Faculty of Science, The University of Tokyo

• Nomura Masaharu

  Department of Chemistry and Research Center for Spectrochemistry, Faculty of Science, The University of Tokyo

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