Aluminium selenide

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Aluminium selenide^[1]
Names

Other names Aluminium(III) selenide
Identifiers
CAS Number	1302-82-5^Y
3D model (JSmol)	Interactive image
ChemSpider	144477^Y
ECHA InfoCard	100.013.737
EC Number	215-110-6
PubChem CID	164804
UNII	4R7PMP996Q
CompTox Dashboard (EPA)	DTXSID80894848
InChI InChI=1S/2Al.3Se/q2+3;3-2^Y Key: CYRGZAAAWQRSMF-UHFFFAOYSA-N^Y InChI=1/2Al.3Se/q2+3;3-2 Key: CYRGZAAAWQRSMF-UHFFFAOYAJ
SMILES [Al+3].[Al+3].[Se-2].[Se-2].[Se-2]
Properties
Chemical formula	Al₂Se₃
Molar mass	290.84 g/mol
Appearance	yellow to brown powder
Odor	odorless
Density	3.437 g/cm³
Melting point	947 °C (1,737 °F; 1,220 K)
Solubility in water	decomposes
Structure
Crystal structure	Monoclinic, mS20, Space group Cc, No. 9^[2]
Thermochemistry
Std molar entropy (S^⦵₂₉₈)	154.8 J/mol K
Std enthalpy of formation (Δ_fH^⦵₂₉₈)	-566.9 kJ/mol
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H331, H373, H410
Precautionary statements	P260, P261, P264, P270, P271, P273, P301+P310, P304+P340, P311, P314, P321, P330, P391, P403+P233, P405, P501
NFPA 704 (fire diamond)	3 0 3
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is ^YN ?) Infobox references

Aluminium selenide is the inorganic compound with the formula Al₂Se₃.

Preparation

It is a solid prepared by igniting a mixture of the elements at 1,000 °C (1,830 °F):

2 Al + 3 Se → Al₂Se₃

The pure compound is white, but typical samples are coloured.^[3] Samples are usually protected from moisture, because they hydrolyze readily, giving off highly toxic hydrogen selenide gas:^[4]

Al₂Se₃ + 3 H₂O → Al₂O₃ + 3 H₂Se

Use

Al₂Se₃ has been used as a precursor to hydrogen selenide, which is released when the solid is treated with acids.^[3]

References

^ Lide, David R. (1998). Handbook of Chemistry and Physics (87 ed.). Boca Raton, Florida: CRC Press. pp. 4–40. ISBN 0-8493-0594-2.
^ Steigmann, G. A.; Goodyear, J. (1966). "The crystal structure of Al₂Se₃". Acta Crystallographica. 20 (5): 617. Bibcode:1966AcCry..20..617S. doi:10.1107/S0365110X66001506.
^ ^a ^b Waitkins, G. R.; Shutt, R. (1946). "Aluminum Selenide and Hydrogen Selenide". Inorganic Syntheses. Vol. 2. pp. 183–186. doi:10.1002/9780470132333.ch55. ISBN 9780470132333.
^ Langner, Bernd E. (2005) "Selenium and Selenium Compounds" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim. doi:10.1002/14356007.a23_525

Aluminium compounds

Al(I)

Organoaluminium(I) compounds	Al(C₅(CH₃)₅)

Al(II)

Al(III)

Alums	(NH₄)Al(SO₄)₂ KAl(SO₄)₂ NaAl(SO₄)₂
Organoaluminium(III) compounds	Al(C₃H₅O₃)₃ C ₃₆H ₆₉AlO ₆ (Al(CH₃)₃)₂ (Al(C₂H₅)₃)₂ Al(CH₂CH(CH₃)₂)₃ Al(C₂H₅)₂Cl Al(C₂H₅)₂CN Al(CH₂CH(CH₃)₂)₂H Al(C₂H₅)₂Cl₂C₂H₅Cl Ti(C₅H₅)₂CH₂ClAl(CH₃)₂

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