Aluminium(II) oxide

{{Short description|Unusual compound of aluminium in its rare oxidation state II}}

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| ImageFile = Aluminium(II)-oxide-3D-vdW.png

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| IUPACName = Aluminium(II) oxide

| OtherNames = Aluminium monoxide
Oxidoaluminium
Oxoaluminum
Aluminious oxide

| SystematicName = Oxoalumanyl radical

| Section1 = {{Chembox Identifiers

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

| ChemSpiderID = 125481

| InChI = 1/Al.O/rAlO/c1-2

| InChIKey = AIRCTMFFNKZQPN-IPBSAJSUAY

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

| StdInChI = 1S/Al.O

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

| StdInChIKey = AIRCTMFFNKZQPN-UHFFFAOYSA-N

| CASNo_Ref = {{cascite|changed|??}}

| CASNo = 142844-00-6

| PubChem = 142249

| ChEBI_Ref = {{ebicite|correct|EBI}}

| ChEBI = 30128

| Gmelin = 349

| SMILES = O=[Al]

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| Section2 = {{Chembox Properties

| Formula =

| Al=1 | O=1

| MolarMass = 42.98 g/mol

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| Section3 = {{Chembox Hazards

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Aluminium(II) oxide or aluminium monoxide is a compound of aluminium and oxygen with the chemical formula AlO. It has been detected in the gas phase after explosion of aluminized grenades in the upper atmosphere{{cite journal| author = D. C. Tyte | title = Red (B2Π–A2σ) Band System of Aluminium Monoxide| doi = 10.1038/202383a0 | journal = Nature | volume = 202| issue = 4930 | year = 1964| page = 383 | bibcode=1964Natur.202..383T| s2cid = 4163250}}{{cite journal| author =D. C. Tyte | title = The dissociation energy of aluminium monoxide | doi = 10.1088/0370-1328/92/4/339 | journal =Proc. Phys. Soc. | volume =92| issue =4 | pages = 1134–1137 | year = 1967|bibcode = 1967PPS....92.1134T }}{{cite journal|author1=Johnson E. R. |author2=Low C. H. | title = Further spectral observations of grenade glow clouds in the lower thermosphere | bibcode = 1967AuJPh..20..577J | journal = Australian Journal of Physics | volume =20 |issue=5 | year = 1967| page = 577 | doi=10.1071/ph670577| doi-access =free }} and in stellar absorption spectra.{{cite journal| author =Merrill, P. W.| author2 =Deutsch, A. J.| author3 =Keenan, P. C.| name-list-style =amp| title = Absorption Spectra of M-Type Mira Variables | doi = 10.1086/147348 | journal =Astrophysical Journal | volume =136 | year = 1962| page = 21 | bibcode=1962ApJ...136...21M}}

Aluminium(II) oxide is one of the aluminium oxides (the most common is Aluminium oxide Al₂O₃), as it was the rare example of aluminium(II) compound since aluminium usually exists in its +3 oxidation state.