Aluminium monohydroxide
# 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.

## Production

In the laboratory AlOH can be made by heating aluminium, so that it vapourises into low pressure hydrogen peroxide vapour. 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 $Al(OH)_2,$ $Al(OH)_3,$ $HAl(OH)_2,$ $cyc-AlO_2$ and AlOAl molecules formed.

## Properties

The bond lengths are, Al-O 1.682 Å, and for O-H 0.878 Å. The rotational constants are $B_0=15,740.2476$ MHz and $D_0=0.02481$ MHz.

