Electron paramagnetic resonance investigation of the Cr(VI) to Cr(V) and/or Cr(III) thermal reductions in single crystals of CrO2-4-doped M2SnCl6 (M = NH+4, K+, CH3NH+3, and [(CH3)2NH2]+)

Jiang Tsu Yu, Ching Jiun Wu, Ssu Hao Lou, Mei Na Tsai

研究成果: 雜誌貢獻期刊論文同行評審

5 引文 斯高帕斯(Scopus)

摘要

We have performed a series of EPR measurements on M2SnCl6 (M = NH+4, CH3NH+3, and [(CH3)2NH2]+) crystals doped with the CrO2-4 ion and thermally treated at different temperatures. Via EPR, we have detected the Cr(VI)O2-4 to Cr(V) and/or Cr(III) thermal reductions. A Cr(V) species, in the form of CrO3-4, is thermally produced in (NH4)2SnCl6 and in K2SnCl6 co-doped with NH+4. We tentatively assign the thermally produced Cr(III) species as isolated Cr3+ ions. We have also studied in some detail the Cr(VI) to Cr(III) thermal reduction in K2SnCl6:CrO2-4 crystals either co-doped with one of the [(CH3)nNH4-n]+ ions (n = 0-4) or coated with CH3NH2 · HCl or NH4Cl. The experimental results indicate that it is the hydrogens of the NH groups which are responsible for the observed reduction. We have analyzed the magnetic symmetries and the spin Hamiltonian parameters of the thermally produced Cr(V) and Cr(III) species. These species can be controllably and repeatably produced via thermal treatments. This thermal method provides an attractive and easily accessible method for the production of the CrO3-4 species, which is conventionally produced via either X- or γ-ray irradiation.

原文英語
頁(從 - 到)159-173
頁數15
期刊Journal of Solid State Chemistry
98
發行號1
DOIs
出版狀態已發佈 - 1992 五月

ASJC Scopus subject areas

  • 電子、光磁材料
  • 陶瓷和複合材料
  • 凝聚態物理學
  • 物理與理論化學
  • 無機化學
  • 材料化學

指紋

深入研究「Electron paramagnetic resonance investigation of the Cr(VI) to Cr(V) and/or Cr(III) thermal reductions in single crystals of CrO<sup>2-</sup><sub>4</sub>-doped M<sub>2</sub>SnCl<sub>6</sub> (M = NH<sup>+</sup><sub>4</sub>, K<sup>+</sup>, CH<sub>3</sub>NH<sup>+</sup><sub>3</sub>, and [(CH<sub>3</sub>)<sub>2</sub>NH<sub>2</sub>]<sup>+</sup>)」主題。共同形成了獨特的指紋。

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