Carbon monoxide absorption by solutions of aluminium copper(I) chloride in various aromatic solvents.

Carbon monoxide absorbents composed of aluminium copper(I) chloride and various aromatic solvents are prepared, and their absorbing capacities are determined. The plot of the equilibrium molar ratio of the absorbed carbon monoxide to AlCuCl4 vs. the ionization potential of the aromatic solvent indicates that both electronic and steric factors are important in the molecular complex formation between AlCuCl4 and aromatic solvent molecules.