Synthesis and characterization of new quaternary polyselenide Ba4TMSbSe12 (TM = Nb, Ta)

Ming Yan Chung, Guan Ruei Chen, Chi-Shen Lee*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Two new quaternary polyselenides, Ba4TMSbSe12 (TM = Nb, Ta), are synthesized using a solid state reaction. They crystallize in a new structural type with a P-1 triclinic space group, characterized according to single-crystal X-ray diffraction. The structure is alternately stacked using isolated NbSe9 5− and SbSe3 3−, which are separated by Ba2+. The structure contains the NbSe9 5− unit with a bipentagonal pyramidal shape coordinated with Se2− and Se2 2− in monodenteate and bidentate modes. The vibrational property of the diselenide Se2 2− unit was studied using Raman spectrum analysis. ultraviolet–visible diffused reflectance and temperature-dependent resistivity measurements indicate semiconductor behaviors. Calculations of electronic structures indicate the presence of a band gap and strong Se-Se interactions in the diselenide group, which experimentally supports the measured physical properties.

Original languageEnglish
Pages (from-to)1072-1077
Number of pages6
JournalJournal of the Chinese Chemical Society
Volume66
Issue number9
DOIs
StatePublished - Sep 2019

Keywords

  • Se-Se bond
  • crystal structure
  • quaternary selenide
  • INFINITE ANIONIC CHAINS
  • CRYSTAL-STRUCTURE
  • OPTICAL-PROPERTIES
  • BUILDING-BLOCK
  • POLYCHALCOGENIDES
  • SULFIDES
  • SELENIDE
  • SE
  • SI

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