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| IUPAC name diazanium;sulfide | |
| Other names Diammonium pentasulfide | |
| Identifiers | |
| CAS Number | |
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| CompTox Dashboard (EPA) | |
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| Properties | |
| Chemical formula | H8N2S5 |
| Molar mass | 196.38 g·mol |
| Appearance | Yellow powder |
| Density | 3.024 g/cm |
| Solubility in water | reacts with water |
| Hazards | |
| GHS labelling: | |
| Pictograms | 
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| Signal word | Warning |
| Precautionary statements | P264, P270, P301, P312, P330, P501 |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references | |
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
- 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.
- "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.