Antimony pentasulfide

Antimony pentasulfide
Identifiers
CAS number	1315-04-4 Y
PubChem	11338637
ChemSpider	17615643 Y
ATC code	R05CA07
Jmol-3D images	Image 1
SMILES S=[Sb](=S)S[Sb](=S)=S
InChI InChI=1S/5S.2Sb Y Key: PPKVREKQVQREQD-UHFFFAOYSA-N Y
Properties
Molecular formula	S5Sb2
Molar mass	403.85 g mol−1
Appearance	yellow to orange powder
Solubility in water	insoluble
Solubility	soluble in HCl soluble in alkalis
Hazards
EU classification	F
R-phrases	R11
Related compounds
Related compounds	Antimony(III) sulfide
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Antimony pentasulfide is an inorganic compound of antimony and sulfur, also known as antimony red. It is a nonstoichiometric compound with a variable composition. Commercial samples are usually are contaminated with sulfur, which may be removed by washing with carbon disulfide in a Soxhlet extractor. 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

Like many sulfides, this compound liberates hydrogen sulfide upon treatment with strong acids like hydrochloric acid.^[1]

6 HCl   +   Sb₂S₅   →   2 SbCl₃   +   3 H₂S   +   2 S

Analysis by Mössbauer spectroscopy indicates that this compound is a derivative antimony(III),^[2] 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

1. ^ Strem MSDS
2. ^ 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.