On the dissolution of gold in K2Qx and Na2Qx fluxes (Q=S, Se). Formation of KAuS5, KAuSe5, CsAuSe3, KAuSe2 and NaAuSe2: Low-dimensional Au+ and Au3+ compounds with poly- and mono-chalcogenide ligands

Younbong Park, Mercouri G. Kanatzidis

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Five compounds of gold, KAuS5, KAuSe5, CsAuSe3, KAuSe2 and NaAuSe2 are reported. Their preparation was accomplished by dissolving gold in molten alkali polychalcogenide salts in the temperature range of 250-350°C. KAuS5 and KAuSe5 crystallize in the space group Ibam with a=8.310(2) Å, b=10.758(3) Å, c=15.468(4) Å, V=1383 Å3, and a=8.625(6) Å, b=11.293(9) Å, c=16.425(11) Å, V=1600 Å3, respectively. CsAuSe3, crystallizes in the space group C2/c with a=6.483(3) Å, b=13.789(5) Å, c=7.651(3) Å, β=112.17(3)°, V=633 Å3. KAuSe2 crystallizes in the space group P4/mbm with a=b=7.699(3) Å, c=3.665(1) Å, V=217 Å3. Finally NaAuSe2 crystallizes in the space group P21/c with a=6.991(8) Å, b=8.374(9) Å, c=6.724(8) Å, β=105.23(9)°, V=379.8 Å3. KAuS5 and KAuSe5 have one-dimensional infinite [AuQ5]- chains with linear Au+ atoms connected with Q2-5 ligands. There are close Au-Au interactions between the chains. CsAuSe3 has a similar one-dimensional structure but the [AuSe3]- chains are helical and there are no Au-Au interactions between the chains. KAuSe2 and NaAuSe2 are Au3+ compounds where the gold atoms are in square planar geometry. The K+ salt has infinite ribbons of [AuSe2]- but the Na salt has corrugated layers of [AuSe2]-. Spectroscopic characterization of the compounds is reported.

Original languageEnglish
Pages (from-to)137-145
Number of pages9
JournalJournal of Alloys and Compounds
Issue number1-2
Publication statusPublished - Jul 25 1997



  • CsAuSe
  • Dissolution of gold
  • KAuS
  • KAuSe
  • KAuSe
  • NaAuSe

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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