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

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

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
Volume257
Issue number1-2
DOIs
Publication statusPublished - Jul 25 1997

Keywords

  • 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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