EXAFS study of chromium ions in the mixed-solvent system of formamide and ammonium formate

Michihiro Miyake, Nobuhiro Nakagawa, Hiroyuki Ohyanagi, Takashi Suzuki

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 CrO4 2- 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 CrO4 2- 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
Publication statusPublished - 1986
Externally publishedYes

Fingerprint

formic acid
X ray absorption
formates
Chromium
chromium
fine structure
Bond length
Ions
tetrahedrons
ions
x rays
Fourier transforms
dissolving
Dissolution
Heating
Oxidation
oxidation
heating
formamide

ASJC Scopus subject areas

  • Inorganic Chemistry

Cite this

Miyake, M., Nakagawa, N., Ohyanagi, H., & Suzuki, T. (1986). EXAFS study of chromium ions in the mixed-solvent system of formamide and ammonium formate. Inorganic Chemistry, 25(5), 700-703.

EXAFS study of chromium ions in the mixed-solvent system of formamide and ammonium formate. / Miyake, Michihiro; Nakagawa, Nobuhiro; Ohyanagi, Hiroyuki; Suzuki, Takashi.

In: Inorganic Chemistry, Vol. 25, No. 5, 1986, p. 700-703.

Research output: Contribution to journalArticle

Miyake, M, Nakagawa, N, Ohyanagi, H & Suzuki, T 1986, 'EXAFS study of chromium ions in the mixed-solvent system of formamide and ammonium formate', Inorganic Chemistry, vol. 25, no. 5, pp. 700-703.
Miyake, Michihiro ; Nakagawa, Nobuhiro ; Ohyanagi, Hiroyuki ; Suzuki, Takashi. / EXAFS study of chromium ions in the mixed-solvent system of formamide and ammonium formate. In: Inorganic Chemistry. 1986 ; Vol. 25, No. 5. pp. 700-703.
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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 CrO4 2- tetrahedra with Cr-O bond lengths of 1.61 {\AA} 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 {\AA}. The CrO4 2- 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.",
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