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Antimony pentasulfide
Introduction
Overview
Overview
Antimony pentasulfide is an inorganic compound of antimony and sulfur, also known as antimony red. It is a nonstoichiometric compound with a variable composition. Its exact structure is unknown.[1] Commercial samples are usually are contaminated with sulfur, which may be removed by washing with carbon disulfide in a Soxhlet extractor.
Production
Production
Antimony pentasulfide can be produced by the reaction of antimony with sulfur at a temperature between 250-400 °C in an inert atmosphere.
Uses
Uses
It may be used as a red pigment and is one possible precursor to Schlippe’s Salt, Na3SbS4, which can be prepared according to the equation:
- 3 Na2S  +  Sb2S5  +  9 H2O  →  2 Na3SbS4·9H2O
Physical chemistry
Physical chemistry
Like many sulfides, this compound liberates hydrogen sulfide upon treatment with strong acids like hydrochloric acid.[2]
- 6 HCl  +  Sb2S5  →  2 SbCl3  +  3 H2S  +  2 S
Analysis by Mössbauer spectroscopy indicates that this compound is a derivative antimony(III),[3] explaining the production of antimony(III) chloride, rather than antimony(V) chloride, upon acidification. It is therefore not analogous to the phosphorus(V) compound phosphorus pentasulfide.
References
References
- ↑ Arnold F. Holleman, Nils Wiberg: Lehrbuch der Anorganischen Chemie, 102nd edition, de Gruyter, Berlin 2007, p. 849, ISBN 978-3-11-017770-1.
- ↑ Strem MSDS
- ↑ G. G. Long, J. G. Stevens, L. H. Bowen, S. L. Ruby (1969). “The oxidation number of antimony in antimony pentasulfide”. Inorganic and Nuclear Chemistry Letters. 5 (1): 21–25. doi:10.1016/0020-1650(69)80231-X.
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]