Aluminium monohydroxide

Hydroxyaluminium(I), also known as Aluminium(I) hydroxide, is an inorganic chemical with molecular formula AlOH. It consists of aluminium in the +1 oxidation state paired with a single hydroxide. It has been detected as a molecular substance in the envelope of an oxygen-rich red supergiant star, a place where substances containing metals or hydroxides are thought to be rare.[2]

Aluminium monohydroxide
Names
IUPAC name
Hydroxyaluminium(I)
Identifiers
3D model (JSmol)
  • InChI=1S/Al.H2O/h;1H2/q+1;/p-1
    Key: MPJGFDUNKYERDK-UHFFFAOYSA-M
  • [Al]O
Properties
AlOH
Molar mass 43.989 g·mol−1
Related compounds
Other anions
 AlSH[1]
Other cations
 GaOH, InOH, TlOH
Related compounds
 Al(OH)2, Al(OH)3
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Production

In the laboratory AlOH can be made by heating aluminium, so that it vapourises into low pressure hydrogen peroxide vapour.[3] Another method is to condense a mixture of aluminium vapour, hydrogen and oxygen with argon into a solid at 10K. Along with AlOH, there are also Al(OH)2, Al(OH)3, HAl(OH)2, cyc-AlO2 and AlOAl molecules formed.[4]

Properties

The bond lengths are, Al-O 1.682 Å, and for O-H 0.878 Å.[3] The rotational constants are B0=15,740.2476 MHz and D0=0.02481 MHz.[3]

References
  1. Fukushima, Masaru; Gerry, Michael C.L. (July 2010). "Fourier transform microwave spectroscopy of aluminum hydrosulfide, AlSH". Journal of Molecular Spectroscopy. 262 (1): 11–15. Bibcode:2010JMoSp.262...11F. doi:10.1016/j.jms.2010.04.005.
  2. Tenenbaum, E. D.; Ziurys, L. M. (2010). "Exotic Metal Molecules in Oxygen-rich Envelopes: Detection of AlOH (X1Σ+) in VY Canis Majoris". Astrophysical Journal. 712 (1): L93–L97. Bibcode:2010ApJ...712L..93T. doi:10.1088/2041-8205/712/1/L93.
  3. Apponi, A. J., Barclay, W. L., Jr., & Ziurys, L. M. (1993). "The millimeter-wave spectrum of AlOH". Astrophysical Journal Letters. 414 (2): L129–L132. Bibcode:1993ApJ...414L.129A. doi:10.1086/187013.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  4. Wang, Xuefeng; Andrews, Lester (March 2007). "Infrared Spectroscopic Observation of the Group 13 Metal Hydroxides, M(OH)1,2,3 (M = Al, Ga, In, and Tl) and HAl(OH)2". The Journal of Physical Chemistry A. 111 (10): 1860–1868. Bibcode:2007JPCA..111.1860W. doi:10.1021/jp066390e. PMID 17388275.
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