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| Names | |
|---|---|
| IUPAC name Lithium hydrosulfide | |
| Preferred IUPAC name Lithium sulfide | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider |
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| ECHA InfoCard | 100.032.013 |
| EC Number |
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| RTECS number |
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| UNII | |
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| Properties | |
| Li2S | |
| Molar mass | 45.95 g/mol |
| Appearance | white solid |
| Density | 1.67 g/cm3 |
| Melting point | 938 °C (1,720 °F; 1,211 K) |
| Boiling point | 1,372 °C (2,502 °F; 1,645 K) |
| decomposes to LiOH and H2S | |
| Solubility | very soluble inethanol |
| Structure | |
| Antifluorite (cubic),cF12 | |
| Fm3m, No. 225 | |
| Tetrahedral (Li+); cubic (S2−) | |
| Thermochemistry | |
Std molar entropy(S⦵298) | 63 J/mol K |
Std enthalpy of formation(ΔfH⦵298) | −9.401 kJ/g or −447 kJ/mol |
| Hazards | |
| NFPA 704 (fire diamond) | |
| Lethal dose or concentration (LD, LC): | |
LD50 (median dose) | 240 mg/kg (oral, rat)[1] |
| Safety data sheet (SDS) | External MSDS |
| Related compounds | |
Otheranions | Lithium oxide Lithium selenide Lithium telluride Lithium polonide |
Othercations | Sodium sulfide Potassium sulfide Rubidium sulfide Caesium sulfide |
Related compounds | Lithium hydrosulfide |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Lithium sulfide is theinorganic compound with theformulaLi2S. It crystallizes in the antifluorite motif, described as the salt (Li+)2S2−. It forms a solid yellow-whitedeliquescent powder. In air, it easily hydrolyses to release foul smellinghydrogen sulfide gas.[2]
Lithium sulfide is prepared by treating lithium with sulfur. This reaction is conveniently conducted inanhydrous ammonia.[3]
The THF-solubletriethylborane adduct of lithium sulfide can be generated usingsuperhydride.[4]
Lithium sulfide has been considered for use inlithium–sulfur batteries.[5]
