Aluminum sulfide, additionally called dialuminium trisulfide, is an ionic compound of aluminum and sulfur represented by the chemical formula Al2S3 <1, 2>. It exist in various crystalline forms and also hydrolyzes come aluminum hydroxide/oxide <3, 4>.

Aluminum Sulfide Identification

CAS Number1302-81-4 <1, 2>
PubChem CID16684788 <6>
ChemSpider ID140154 <1>
EC Number215-109-0 <1, 2>

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Aluminum Sulfide Formula

How is Aluminum Sulfide Prepared

Its synthetic through direct heating the aluminum and also sulfur have the right to be stood for by the complying with equation <7>:

2Al + 3S → Al2S3

However, the reaction is very exothermic, and it is not desirable to warm the whole mixture <7>. Also, sulfur is a volatile reactant the melts away before the reaction takes location <7>. Therefore, lead sulfide is frequently used because that the ready of Al2S3 <7>:

2Al + 3PbS → Al2S3 + 3Pb


Aluminum Sulfide

Reactions with other Compounds

Aluminum Sulfide and also Water

When aluminum sulfide is exposed to moisture in the atmosphere, it undergoes hydrolysis reaction to type aluminum hydroxide and also hydrogen sulfide <5>.

Al2S3 + 6H2O → 2Al(OH)3 + 3H2S

Aluminum Sulfide and Hydrochloric Acid

Aluminum sulfide upon reacting with hydrochloric acid develops hydrogen sulfide and aluminum chloride, together shown listed below <8>:

Al2S3 + 6HCl → 2AlCl3 + 3H2S


Aluminum Sulfide Lewis Structure

Properties and also Characteristics the Aluminum Sulfide

General Properties

Molar Mass/Molecular Weight150.158 g/mol <1>

Physical Properties

Color and AppearanceGray flour or granules <2>
Melting Point1,100 °C, 2,012 °F <2>
Boiling Point1,500 °C, 2,732 °F <2>
Density2.32 g cm-3 <2>
State of issue at room temperature (solid/liquid/gas)Solid <2>
SolubilityInsoluble in (CH3)2CO (acetone) <9>
Solubility in WaterReacts and decomposes in H2O <9>
Heat capacity (C) 105.1 J/mol K
Standard Molar Enthalpy-724 kJ/mol <9>
Standard Molar Entropy116.9 J/mol K

Atomic Properties

Crystal StructureTrigonal, tetragonal, hexagonal <3, 4>


Aluminum Sulfide crystal Structure

What is It used for

Producing organic compounds favor ethanethiol and also chemicals forced for tanning and making file <10>Preparing hydrogen sulfide that has several commercial uses <11>

Is Aluminum Sulfide Toxic

Exposure come aluminum sulfide can cause skin and also severe eye irritation <12>. Inhalation that dust, vapor, or fumes can cause an obstacle in breathing <12>.


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