aluminium selenide
{{Chembox
| Watchedfields = changed
| verifiedrevid = 452223178
| Name = Aluminium selenide
{{cite book
| last = Lide
| first = David R.
| year = 1998
| title = Handbook of Chemistry and Physics
| edition = 87
| publication-place = Boca Raton, Florida
| publisher = CRC Press
| isbn = 0-8493-0594-2
| pages = 4–40
}}
| ImageFile = AlSestructure.png
| ImageSize =
| ImageName = Aluminum selenide
| OtherNames = Aluminium(III) selenide
|Section1={{Chembox Identifiers
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 144477
| EC_number = 215-110-6
| UNII = 4R7PMP996Q
| DTXSID = DTXSID80894848
| InChI = 1/2Al.3Se/q2*+3;3*-2
| InChIKey = CYRGZAAAWQRSMF-UHFFFAOYAJ
| SMILES = [Al+3].[Al+3].[Se-2].[Se-2].[Se-2]
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI = 1S/2Al.3Se/q2*+3;3*-2
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = CYRGZAAAWQRSMF-UHFFFAOYSA-N
| CASNo_Ref = {{cascite|correct|??}}
| CASNo = 1302-82-5
| PubChem = 164804
| EINECS =
}}
|Section2={{Chembox Properties
| Formula = Al2Se3
| MolarMass = 290.84 g/mol
| Appearance = yellow to brown powder
| Odor = odorless
| Density = 3.437 g/cm3
| Solubility = decomposes
| MeltingPtC = 947
| BoilingPtC =
}}
|Section3={{Chembox Structure
| CrystalStruct = Monoclinic, mS20, Space group Cc, No. 9{{cite journal|last1=Steigmann|first1=G. A.|last2=Goodyear|first2=J.|title=The crystal structure of Al2Se3|journal=Acta Crystallographica|volume=20|issue=5|pages=617|year=1966|doi=10.1107/S0365110X66001506|doi-access=free|bibcode=1966AcCry..20..617S }}
}}
|Section4={{Chembox Thermochemistry
| DeltaHf = -566.9 kJ/mol
| Entropy = 154.8 J/mol K
}}
|Section7={{Chembox Hazards
| GHSPictograms = {{GHS06}}{{GHS08}}{{GHS09}}
| GHSSignalWord = Danger
| HPhrases = {{H-phrases|301|331|373|410}}
| PPhrases = {{P-phrases|260|261|264|270|271|273|301+310|304+340|311|314|321|330|391|403+233|405|501}}
| NFPA-H = 3
| NFPA-R = 3
| NFPA-F = 0
}}
}}
Aluminium selenide is the inorganic compound with the formula Al2Se3.
Preparation
It is a solid prepared by igniting a mixture of the elements at {{convert|1000|C}}:
:2 Al + 3 Se → Al2Se3
The pure compound is white, but typical samples are coloured.{{cite book | last1 = Waitkins | first1 = G. R. | last2 = Shutt | first2 = R. | chapter = Aluminum Selenide and Hydrogen Selenide | year = 1946 | title = Inorganic Syntheses | volume = 2 | pages = 183–186 | doi = 10.1002/9780470132333.ch55 | isbn = 9780470132333 }} Samples are usually protected from moisture, because they hydrolyze readily, giving off highly toxic hydrogen selenide gas:Langner, Bernd E. (2005) "Selenium and Selenium Compounds" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim. {{doi|10.1002/14356007.a23_525}}
:Al2Se3 + 3 H2O → Al2O3 + 3 H2Se