11/30/2023 0 Comments Melt chromium chloride crystals![]() ![]() Hydrogen bonds link the cation and anions. The hexahydrate consists of octahedral 3+ cation centers and chloride anions ( Cl −) as counterions. The melt conducts electricity poorly, unlike more ionic halides such as sodium chloride.Īluminium chloride monomer belongs to the point group D 3h in its monomeric form and D 2h in its dimeric form. At higher temperatures, the Al 2Cl 6 dimers dissociate into trigonal planar AlCl 3 monomer, which is structurally analogous to BF 3. Al 2Cl 6 dimers are also found in the vapour phase. ![]() This change in structure is related to the lower density of the liquid phase (1.78 g/cm 3) versus solid aluminium trichloride (2.48 g/cm 3). When aluminium trichloride is in its melted state, it exists as the dimer Al 2Cl 6, with tetracoordinate aluminium. Yttrium(III) chloride adopts the same structure, as do a range of other compounds. In this framework, the Al centres exhibit octahedral coordination geometry. Solid AlCl 3 has a sheet-like layered structure with cubic close-packed chloride ions. It is an example of an inorganic compound that reversibly changes from a polymer to a monomer at mild temperature.ĪlCl 3 adopts three structures, depending on the temperature and the state (solid, liquid, gas). The compound is often cited as a Lewis acid. It is mainly produced and consumed in the production of aluminium metal, but large amounts are also used in other areas of the chemical industry. The anhydrous form is important commercially. Both the anhydrous form and the hexahydrate are colourless crystals, but samples are often contaminated with iron(III) chloride, giving them a yellow colour. It forms a hexahydrate with the formula Cl 3, containing six water molecules of hydration. Aluminium chloride, also known as aluminium trichloride, is an inorganic compound with the formula AlCl 3. ![]()
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