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

Michihiro Miyake; Takashi Suzuki; Nobuhiro Nakagawa; Hiroyuki Ohyanagi

doi:10.1021/ic00225a023

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 journal › Article › peer-review

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 language	English
Pages (from-to)	700-703
Number of pages	4
Journal	Inorganic Chemistry
Volume	25
Issue number	5
DOIs	https://doi.org/10.1021/ic00225a023
Publication status	Published - 1986
Externally published	Yes

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Inorganic Chemistry

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title = "EXAFS Study of Chromium Ions in the Mixed-Solvent System of Formamide and Ammonium Formate",

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 {\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 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.",

author = "Michihiro Miyake and Takashi Suzuki and Nobuhiro Nakagawa and Hiroyuki Ohyanagi",

year = "1986",

doi = "10.1021/ic00225a023",

language = "English",

volume = "25",

pages = "700--703",

journal = "Inorganic Chemistry",

issn = "0020-1669",

publisher = "American Chemical Society",

number = "5",

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T1 - EXAFS Study of Chromium Ions in the Mixed-Solvent System of Formamide and Ammonium Formate

AU - Miyake, Michihiro

AU - Suzuki, Takashi

AU - Nakagawa, Nobuhiro

AU - Ohyanagi, Hiroyuki

PY - 1986

Y1 - 1986

N2 - 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.

AB - 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.

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JO - Inorganic Chemistry

JF - Inorganic Chemistry

IS - 5

ER -

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

Abstract

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