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Additional recommended knowledge
Rhenium trichloride was first discovered in 1932 by Geilnann, Wriuce, and Biltz. 
Structure and physical properties
The crystal structure of rhenium trichloride consists of well-defined Re3Cl9 units that are connected by chlorine atom bridges. The Re3Cl9 unit structure also applies to rhenium trichloride dissolved in a variety of solvents, with the only possible exception being the dimer structure when dissolved in acetic acid. The Re3Cl9 crystal structure has C3v symmetry.
Rhenium trichloride is comparatively non-volatile but produces a green vapour during strong heating. It may have a very small temperature-independent paramagnetism, but the susceptibility is ambiguous. 
Rhenium trichloride prepared from rhenium pentachloride without further treatment is chemically reactive, but if it is vacuum sublimed at 500 oC, then it becomes comparatively unreactive. However, x-ray diffraction tests show no observable difference in structure between the untreated and vacuum sublimed material.
Rhenium trichloride is most efficiently prepared by the thermal decomposition of rhenium pentachloride in nitrogen. Other methods include reacting sulphuryl chloride with rhenium powder with or without the addition of aluminum chloride, the thermal decomposition of salts of hexachlororhenic(IV) acid, or the heating of Re2(O2CCH3)4Cl2 under HCl gas.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Rhenium_trichloride". A list of authors is available in Wikipedia.|