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Aluminium monochloride is the metal halide with the formula AlCl. This compound is produced as a step in the Alcan process to smelt aluminium from an aluminium-rich alloy. When the alloy is placed in a reactor that is heated to 1,300 °C and mixed with aluminium trichloride, a gas of aluminium monochloride is produced.
2Al{alloy} + AlCl3{gas} → 3AlCl{gas}
It then disproportionates into aluminium melt and aluminium trichloride upon cooling to 900 °C.
This molecule has been detected in the interstellar medium, where molecules are so dilute that intermolecular collisions are unimportant.
References
Aluminium monochloride Wikipedia(Text) CC BY-SA