Abstract
The coordination structures of the Cu ions in the mixed solvent system of HCONH2-HCOONH4 at room temperature and 100 °C have been investigated using the EXAFS (extended X-ray absorption fine structure) method for the Cu K-edge, together with visible absorption spectrum analyses and ion-exchange experiments. The Cu ions, which are divalent, CuII, at room temperature, are reduced to univalence, CuI, by heating with HCOO- ions, ca. 80% of CuII ions are transformed into CuI, ions at 100 °C. In the mixed solvent system, it was found that CuII ions form neutral [Cu(HCOO)2(HCONH2)4] octahedra, distorted by the Jahn-Teller effect, with four short Cu-O bond lengths of ca. 1.97 Å and two long Cu-O bond lengths of ca. 2.82 Å at room temperature, and CuI ions form cationic [Cu(HCONH2)3]+ plane triangles with three Cu-O bond lengths of ca. 1.90 Å at 100 °C. The transition of the coordination structures occurs reversibly in the mixed solvent system as a function of the temperature.
| Original language | English |
|---|---|
| Pages (from-to) | 1721-1727 |
| Number of pages | 7 |
| Journal | Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics |
| Volume | 85 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - 1989 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Physical and Theoretical Chemistry
Cite this
Coordination structures of Cu ions in the mixed-solvent system of formamide and ammonium formate. / Miyake, Michihiro; Nagahara, Shin; Yoshikawa, Yumi; Suzuki, Takashi.
In: Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics, Vol. 85, No. 11, 1989, p. 1721-1727.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Coordination structures of Cu ions in the mixed-solvent system of formamide and ammonium formate
AU - Miyake, Michihiro
AU - Nagahara, Shin
AU - Yoshikawa, Yumi
AU - Suzuki, Takashi
PY - 1989
Y1 - 1989
N2 - The coordination structures of the Cu ions in the mixed solvent system of HCONH2-HCOONH4 at room temperature and 100 °C have been investigated using the EXAFS (extended X-ray absorption fine structure) method for the Cu K-edge, together with visible absorption spectrum analyses and ion-exchange experiments. The Cu ions, which are divalent, CuII, at room temperature, are reduced to univalence, CuI, by heating with HCOO- ions, ca. 80% of CuII ions are transformed into CuI, ions at 100 °C. In the mixed solvent system, it was found that CuII ions form neutral [Cu(HCOO)2(HCONH2)4] octahedra, distorted by the Jahn-Teller effect, with four short Cu-O bond lengths of ca. 1.97 Å and two long Cu-O bond lengths of ca. 2.82 Å at room temperature, and CuI ions form cationic [Cu(HCONH2)3]+ plane triangles with three Cu-O bond lengths of ca. 1.90 Å at 100 °C. The transition of the coordination structures occurs reversibly in the mixed solvent system as a function of the temperature.
AB - The coordination structures of the Cu ions in the mixed solvent system of HCONH2-HCOONH4 at room temperature and 100 °C have been investigated using the EXAFS (extended X-ray absorption fine structure) method for the Cu K-edge, together with visible absorption spectrum analyses and ion-exchange experiments. The Cu ions, which are divalent, CuII, at room temperature, are reduced to univalence, CuI, by heating with HCOO- ions, ca. 80% of CuII ions are transformed into CuI, ions at 100 °C. In the mixed solvent system, it was found that CuII ions form neutral [Cu(HCOO)2(HCONH2)4] octahedra, distorted by the Jahn-Teller effect, with four short Cu-O bond lengths of ca. 1.97 Å and two long Cu-O bond lengths of ca. 2.82 Å at room temperature, and CuI ions form cationic [Cu(HCONH2)3]+ plane triangles with three Cu-O bond lengths of ca. 1.90 Å at 100 °C. The transition of the coordination structures occurs reversibly in the mixed solvent system as a function of the temperature.
UR - http://www.scopus.com/inward/record.url?scp=37049074160&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=37049074160&partnerID=8YFLogxK
U2 - 10.1039/F29898501721
DO - 10.1039/F29898501721
M3 - Article
AN - SCOPUS:37049074160
VL - 85
SP - 1721
EP - 1727
JO - Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics
JF - Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics
SN - 0300-9238
IS - 11
ER -