EXAFS Study of Chromium Ions in the Mixed-Solvent System of Formamide and Ammonium Formate

Michihiro Miyake, Takashi Suzuki, Nobuhiro Nakagawa, Hiroyuki Ohyanagi

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

EXAFS (extended X-ray absorption fine structure) spectra of Cr ions exhibiting two oxidation states, Cr(VI) and Cr(III), in the mixed-solvent system of HCONH2 and HCOONH4 have been investigated for the Cr K edge by Fourier transform and parameter-fitting methods. In the mixed-solvent system, it was found that Cr(VI) ions form mononuclear CrO42- tetrahedra with Cr-O bond lengths of 1.61 Å and Cr(III) ions form mononuclear [Cr(HCOO)x(HCONH2)y]3-x (x + y 6; 4 ≤ x ≤ 6) octahedra with Cr-O bond lengths of 2.00 Å. The CrO42- tetrahedra, which exist in the mixed-solvent system at an initial state of dissolution of CrO3, are transformed into the [Cr(HCOO)x(HCONH2)y]3-x octahedra by heating reduction.

Original languageEnglish
Pages (from-to)700-703
Number of pages4
JournalInorganic Chemistry
Volume25
Issue number5
DOIs
Publication statusPublished - Jan 1 1986
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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