AMTeS3(A = K, Rb, Cs; M = Cu, Ag): A New Class of Compounds Based on a New Polychalcogenide Anion, TeS32-

Xiang Zhang, Mercouri G. Kanatzidis*

*Corresponding author for this work

Research output: Contribution to journalArticle

49 Scopus citations

Abstract

The reaction of Cu or Ag with mixed polychalcogenide flux A2SxTey, (A = K, Rb, Cs) yielded RbCuTeS3(1), CsCuTeS3(2), α-KAgTeS3(3), β-KAgTeS3(4), RbAgTeS3(5), and CsAgTeS3(6) possessing new structure types. Compounds 1, 4, 5, and 6 are two-dimensional and isostructural. They crystallize in the monoclinic space group P21/c, with a = 7.434(3) Å, b = 10.526(3) Å, c = 8.234(3) Å, β = 106.13(3)°, V = 619.0(7) Å3for 1; a = 7.340(2) Å, b = 10.647(2) Å, c = 8.504(2) Å,β= 106.46(2)°, V = 637.4(3) Å3for 4; a = 7.566(8) Å, b = 10.724(8) Å, c = 8.586(9) Å, β = 106.36(8)°, V = 668(2) Å3for 5; and a = 7.832(6) Å, b = 10.803(7) Å, c = 8.668(8) Å, β = 106.05(6)° V = 705(2) Å3for 6. The structure consists of anionic [MTeS3]nn-(M = Cu or Ag) layers and charge-compensating alkali ions between the layers. Each layer is composed of tetrahedrally coordinated Cu+or Ag+centers and trigonal pyramidal TeS32-units, joined together via bridging S atoms. Compound 2 is three-dimensional and crystallizes in the cubic space group P213 with a = 9.107(3) Å and V = 755.4(2) Å3. Its framework is composed of trigonal planar Cu+centers and TeS32-units. Compound 3 is two-dimensional and crystallizes in the monoclinic space group P21n with a = 6.171(2) Å, b = 16.406(4) Å, c = 6.318(3) Å, β = 97.32(3)°, and V = 634.4(7) Å3. The structure of [AgTeS3]nn- layers is different from those of 1, 4, 5, and 6, but the TeS32-units bridge Ag+centers by the same pattern. All compounds are found to be wide band gap semiconductors with RbCuTeS3possessing the narrowest at 1.95 eV. Thermal analysis studies show that 3, 5, and 6 are the most stable.

Original languageEnglish (US)
Pages (from-to)1890-1898
Number of pages9
JournalJournal of the American Chemical Society
Volume116
Issue number5
DOIs
StatePublished - Sep 1 1994

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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