|Molar mass||403.85 g·mol−1|
|Appearance||yellow to orange powder|
|Density||4.12 g/cm 3|
|Melting point||135 °C (275 °F; 408 K) (decomposes)|
|Solubility||soluble in HCl
soluble in alkalis
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
|what is: / ?)(|
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. Commercial samples are usually are contaminated with sulfur, which may be removed by washing with carbon disulfide in a Soxhlet extractor.
Antimony pentasulfide can be produced by the reaction of antimony with sulfur at a temperature between 250-400 °C in an inert atmosphere.
- 3 Na2S + Sb2S5 + 9 H2O → 2 Na3SbS4·9H2O
- 6 HCl + Sb2S5 → 2 SbCl3 + 3 H2S + 2 S
Analysis by Mössbauer spectroscopy indicates that this compound is a derivative antimony(III), 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.
- 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.