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Ammonium pentasulfide is a chemical compound with the chemical formula (NH₄)₂S₅.

Synthesis

Passing hydrogen sulfide through a suspension of powdered sulfur in a concentrated ammonia solution:

2NH₃ + H₂S + 4S → (NH₄)₂S₅

Physical properties

Ammonium tellurate forms yellow crystals, decomposing in water, of monoclinic system, spatial group P 21/C, cell parameters a = 0.5427 nm, B = 1.6226 Nm, c = 0.9430 Nm, β = 105.31°, Z = 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:

(NH₄)₂S₅ → 2NH₃ + H₂S + 4S

References

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. "Crystal structure of diammoniumpentasulfide (NH4)2S5". Zeitschrift für Kristallographie. 172 (1–2): 153–158. 1 January 1985. 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.

• Ammonium compounds
• Sulfides