AlClHSO

AlClHSO is a mixed inorganic compound composed of aluminum (Al), chlorine (Cl), hydrogen (H), sulfur (S), and oxygen (O). The empirical formula suggests a stoichiometric combination that could be interpreted as an aluminum chloride‑hydrogen sulfite, potentially forming a coordination complex or double salt containing both chloride and hydrogen sulfite (bisulfite) anions bound to an aluminum centre. The exact crystalline structure has not been widely reported, but related aluminum–chloride–sulfite systems typically adopt layered or polymeric arrangements in which Al³⁺ is octahedrally coordinated by a mixture of chloride and oxygen ligands from the sulfite moiety.

Synthesis of AlClHSO is generally achieved by reacting anhydrous aluminum chloride with a stoichiometric amount of sodium bisulfite or sulfurous acid under controlled temperature, often in a non‑aqueous solvent to prevent hydrolysis. The reaction proceeds via partial substitution of chloride ligands by sulfite groups, yielding a solid that can be isolated by filtration and dried under vacuum.

Physical properties reported for similar compounds include a white to off‑white powder, moderate solubility in polar organic solvents, and stability only in the absence of moisture; exposure to water typically leads to hydrolysis, releasing HCl and sulfurous acid. Thermal analysis shows decomposition near 200 °C, producing Al₂O₃, SO₂, and HCl gases.

Potential applications are limited but may involve use as a precursor in the preparation of aluminum‑based catalysts, as a source of sulfite ions in controlled‑release formulations, or in laboratory studies of mixed‑anion coordination chemistry. Handling requires standard protective equipment, as the material can be corrosive and release irritating gases upon decomposition.