Lithium sulfide

{{Chembox

| Watchedfields = changed

| verifiedrevid = 446984298

| IUPACName = Lithium hydrosulfide

| ImageFile = File:Lithium-sulfide-2D.png

| ImageSize = 150px

| ImageFile1 = Sodium-oxide-unit-cell-3D-balls-B.png

| ImageSize1 = 200

| ImageFile2 = File:CaF2 polyhedra.png

| ImageSize2 =

| ImageCaption2 = __ Li⁺     __ S²⁻

| PIN = Lithium sulfide

|Section1={{Chembox Identifiers

| SMILES1 = [Li+].[Li+].[S-2]

| InChI = 1S/2Li.S/q2*+1;-2

| InChIKey1 = GLNWILHOFOBOFD-UHFFFAOYSA-N

| CASNo = 12136-58-2

| CASNo_Ref = {{cascite|correct|CAS}}

| UNII_Ref = {{fdacite|correct|FDA}}

| UNII = SW6C51V9JZ

| PubChem = 10290727

| ChemSpiderID = 8466196

| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}

| EINECS = 235-228-1

| RTECS = OJ6439500

| SMILES = [Li+].[Li+].[S-2]

| StdInChI_Ref = {{stdinchicite|correct|chemspider}}

| StdInChI = 1S/2Li.S/q2*+1;-2

| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}

| StdInChIKey = GLNWILHOFOBOFD-UHFFFAOYSA-N}}

|Section2={{Chembox Properties

| Formula = Li₂S

| MolarMass = 45.95 g/mol

| Appearance = white solid

| Density = 1.67 g/cm³

| MeltingPtC = 938

| BoilingPtC = 1372

| Solubility = decomposes to LiOH and H₂S

| SolubleOther = very soluble in ethanol

}}

|Section3={{Chembox Structure

| CrystalStruct = Antifluorite (cubic), cF12

| SpaceGroup = Fm3m, No. 225

| Coordination = Tetrahedral (Li⁺); cubic (S²⁻)

| LattConst_a =

| LattConst_alpha =

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|Section4={{Chembox Thermochemistry

| DeltaHf = −9.401 kJ/g or −447 kJ/mol

| DeltaHc =

| Entropy = 63 J/mol K

| HeatCapacity =

}}

|Section7={{Chembox Hazards

| ExternalSDS = [http://loradchemical.com/data/sds/SDS-Lithium-Sulfide.pdf External MSDS]

| MainHazards =

| NFPA-H = 3

| NFPA-F = 1

| NFPA-R = 1

| NFPA-S =

| FlashPt =

| AutoignitionPt =

| LD50 = 240 mg/kg (oral, rat)https://chem.nlm.nih.gov/chemidplus/rn/12136-58-2 {{Dead link|date=March 2022}}

}}

|Section8={{Chembox Related

| OtherAnions = Lithium oxide
Lithium selenide
Lithium telluride
Lithium polonide

| OtherCations = Sodium sulfide
Potassium sulfide
Rubidium sulfide
Caesium sulfide

| OtherFunction =

| OtherFunction_label =

| OtherCompounds = Lithium hydrosulfide

}}

}}

Lithium sulfide is the inorganic compound with the formula Li₂S. It crystallizes in the antifluorite motif, described as the salt (Li⁺)₂S²⁻. It forms a solid yellow-white deliquescent powder. In air, it easily hydrolyses to release foul smelling hydrogen sulfide gas.Greenwood, N. N.; & Earnshaw, A. (1997). Chemistry of the Elements (2nd Edn.), Oxford:Butterworth-Heinemann. {{ISBN|0-7506-3365-4}}.