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Aluminate cement

Calcium aluminate powder

Polyaluminum chloride

Alumina powder

Polyaluminum chloride

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Polyaluminum chloride

Aluminum chloride is an inorganic compound with the chemical formula AlCl₃; it is a compound of chlorine and aluminum. Aluminum chloride has a low melting point and a low boiling point, and it sublimes. It is a covalent compound. Molten aluminum chloride does not conduct electricity easily, unlike most salts containing halide ions (such as sodium chloride).

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AlCl3 adopts the “YCl3” structure, which features a cubic close-packed layer arrangement of Al3+ ions. In contrast, in AlBr3, Al3+ ions occupy the adjacent tetrahedral interstices within the Br−-ion’s closest-packed framework. When melted, AlCl3 forms a volatile dimer, Al2Cl6, which contains two three-center four-electron chloride bridges. At higher temperatures, the Al2Cl6 dimer dissociates to yield planar trigonal AlCl3 molecules, a structure similar to that of boron trifluoride (BF3).

Aluminum chloride is a white, crystalline powder. In the vapor state, in nonpolar solvents, or in the molten state, aluminum chloride exists as covalently bonded dimer molecules (Al₂Cl₆). It is soluble in water and many organic solvents. Aqueous solutions are acidic. In the presence of aromatic hydrocarbons, a mixture of aluminum chloride with aluminum can be used to synthesize di(aryl)metal complexes. For example, bis(benzene)chromium is prepared via the Fischer-Hafner synthesis using specific metal halides.