Single Crystal X-Ray Structure Analysis under High Pressure Using He Gas as a Pressure Transmitting Medium. Crystal Structure of Mixed-Valence Complexes Cs2AuIAuIIIX6.

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  • Matsushita Nobuyuki
    Department of Chemistry, Graduate School of Arts and Sciences, The University of Tokyo

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  • ヘリウムガス媒体による高圧下単結晶Ｘ線構造解析　　混合原子価錯体Ｃｓ２Ａｕ｀Ｉ´Ａｕ｀ＩＩＩ´Ｘ６の結晶構造
  • ヘリウムガス バイタイ ニ ヨル コウアツカタンケッショウ Xセン コウゾウ
  • Crystal Structure of Mixed-Valence Complexes Cs<SUB>2</SUB>Au<SUP>I</SUP>Au<SUP>III</SUP>X<SUB>6</SUB>
  • 混合原子価錯体Cs<SUB>2</SUB>Au<SUP>I</SUP>Au<SUP>III</SUP>X<SUB>6</SUB>の結晶構造

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Abstract

In this report, a technique of single-crystal X-ray diffraction measurements under high pressures, using a diamond-anvil-cell with helium gas as an inert and hydrostatic pressure-transmitting medium, is introduced. The technique has been applied to three-dimensional halogen-bridged mixed-valence gold complexes, Cs2AuIAuIIIX6 (X=Cl, I) to investigate the mixed-valence state and the crystal structure under high pressures up to 18 GPa and 7. 5 GPa, respectively. The pressure dependences of the unit cell parameters indicate that structural phase transitions occur from tetragonal to cubic at 12. 5 GPa for the Cl-bridged complex, and from tetragonal to monoclinic at 6. 0 GPa for the I-bridged complex. The Cl-bridged complex in the higher pressure phase has a space group, Pm3m and the cubic Perovskite-type structure.

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