Ammonium pentasulfide

Ammonium pentasulfide
Names
	IUPAC name diazanium;pentasulfide
	Other names Diammonium pentasulfide
Identifiers
CAS Number	12135-77-2;
3D model (JSmol)	Interactive image;
ChemSpider	95740767;
EC Number	235-223-4;
PubChem CID	133108861;
CompTox Dashboard (EPA)	DTXCID201333664;
	InChI InChI=1S/2H3N.H2S5/c;;1-3-5-4-2/h2*1H3;1-2H Key: PRPVKBZLCJDRNZ-UHFFFAOYSA-N;
	SMILES [NH4+].[NH4+].[S-]SSS[S-];
Properties
Chemical formula	H8N2S5
Molar mass	196.38 g·mol−1
Appearance	Yellow powder
Density	1.6 g/cm3
Solubility in water	decomposes in water
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Ammonium pentasulfide is a chemical compound with the chemical formula (NH₄)₂S₅.^[1]

Synthesis

Passing hydrogen sulfide through a suspension of powdered sulfur in a concentrated ammonia solution:^[2]^[3]

2NH₃ + H₂S + 4S → (NH₄)₂S₅

Physical properties

Ammonium sulfide forms yellow crystals, decomposing in water, of monoclinic system, space group P2₁/c, cell parameters a = 0.5427 nm, b = 1.6226 nm, c = 0.9430 nm, β = 105.31°, Z = 4.^[4]

The compound can be stored under the mother liquor without air access. When dry, it decomposes quickly in the air. the compound emits sulfur intensively in water and melts in a sealed ampoule at 95 °C to form a red liquid.

Chemical properties

The compound decomposes when stored in air or slightly heated:^[5]

(NH₄)₂S₅ → 2NH₃ + H₂S + 4S

References

^ Inorganic Syntheses, Volume 21. John Wiley & Sons. 22 September 2009. p. 15. ISBN 978-0-470-13287-6. Retrieved 14 January 2025.
^ Brauer, Georg (2 December 2012). Handbook of Preparative Inorganic Chemistry V1. Elsevier. p. 369. ISBN 978-0-323-16127-5. Retrieved 14 January 2025.
^ Macintyre, Jane E. (23 July 1992). Dictionary of Inorganic Compounds. CRC Press. p. 3802. ISBN 978-0-412-30120-9. Retrieved 14 January 2025.
^ von Schnering, H. G.; Goh, N. K.; Peters, K. (1 January 1985). "Crystal structure of diammoniumpentasulfide (NH4)2S5". Zeitschrift für Kristallographie. 172 (1–2): 153–158. Bibcode:1985ZK....172..153V. doi:10.1524/zkri.1985.172.1-2.153. ISSN 0044-2968. Retrieved 14 January 2025.
^ Steudel, Ralf (26 January 2004). Elemental Sulfur and Sulfur-Rich Compounds II. Springer. p. 133. ISBN 978-3-540-44951-5. Retrieved 14 January 2025.

[1] Inorganic Syntheses, Volume 21. John Wiley & Sons. 22 September 2009. p. 15. ISBN 978-0-470-13287-6. Retrieved 14 January 2025.

[2] Brauer, Georg (2 December 2012). Handbook of Preparative Inorganic Chemistry V1. Elsevier. p. 369. ISBN 978-0-323-16127-5. Retrieved 14 January 2025.

[3] Macintyre, Jane E. (23 July 1992). Dictionary of Inorganic Compounds. CRC Press. p. 3802. ISBN 978-0-412-30120-9. Retrieved 14 January 2025.

[4] von Schnering, H. G.; Goh, N. K.; Peters, K. (1 January 1985). "Crystal structure of diammoniumpentasulfide (NH4)2S5". Zeitschrift für Kristallographie. 172 (1–2): 153–158. Bibcode:1985ZK....172..153V. doi:10.1524/zkri.1985.172.1-2.153. ISSN 0044-2968. Retrieved 14 January 2025.

[5] Steudel, Ralf (26 January 2004). Elemental Sulfur and Sulfur-Rich Compounds II. Springer. p. 133. ISBN 978-3-540-44951-5. Retrieved 14 January 2025.

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