AEuAsS3 (A = Li, K, Rb, and Cs): New As3+ species from an arsenic-rich polysulfide flux

Tarun K. Bera, Mercouri G. Kanatzidis

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Abstract

Four europium compounds, LiEuAsS3 (I), KEuAsS3 (IIa), RbEuAsS3 (IIb), and CsEuAsS3 (IIc), containing As 3+ were synthesized in molten alkali-metal polysulfide salts. An As-rich flux was found to be necessary to stabilize the pyramidal building unit [AsS3]3-. All crystallize in the monoclinic space group P21/c with two new structure types. Compound I features a new coordination mode for the [AsS3]3- unit and three-dimensional [Eu(AsS3)]- framework. Compounds IIa-c are isostructural and feature a layer of [Eu(AsS3)]- with an unusual μ5-sulfide anion in a umbrella-like geometry. The compounds are paramagnetic semiconductors with an energy gap of ∼2.0 eV.

Original languageEnglish
Pages (from-to)7068-7070
Number of pages3
JournalInorganic Chemistry
Volume47
Issue number16
DOIs
Publication statusPublished - Aug 18 2008

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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