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

Tarun K. Bera; Mercouri G. Kanatzidis

doi:10.1021/ic801017h

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

Tarun K. Bera, Mercouri G. Kanatzidis

Northwestern University

Research output: Contribution to journal › Article

31 Citations (Scopus)

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 language	English
Pages (from-to)	7068-7070
Number of pages	3
Journal	Inorganic Chemistry
Volume	47
Issue number	16
DOIs	https://doi.org/10.1021/ic801017h
Publication status	Published - Aug 18 2008

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ASJC Scopus subject areas

Physical and Theoretical Chemistry
Inorganic Chemistry

Cite this

Bera, T. K., & Kanatzidis, M. G. (2008). AEuAsS₃ (A = Li, K, Rb, and Cs): New As³⁺ species from an arsenic-rich polysulfide flux. Inorganic Chemistry, 47(16), 7068-7070. https://doi.org/10.1021/ic801017h

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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.",

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AB - 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.

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10.1021/ic801017h