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Chromium(II)tetrachloroaluminate can be prepared by reaction of chromium, chromium trichloride and aluminum trichloride in the molar ratio 1 : 1.94 : 5.79 or by reaction of stoichiometric amounts of chromium dichloride and aluminum trichloride. Sublimation of the compound yields phase-pure samples of colourless crystals. Cr(AlCl 4 ) 2  crystallizes in the non-centrosymmetric orthorhombic space group Pca2 1  (No. 29), a = 1511.38(3), b = 604.71(1), c = 1301.76(3) pm. The aggregation of Cr(AlCl 4 ) 2  molecules leads to a square-bipyramidal coordination of the chromium atom typical of high-spin d 4  ions due to the Jahn-Teller effect. The relationship to centrosymmetric Pd(AlCl 4 ) 2  (P2 1 /c) which is built up of similar molecules was established by means of a group-subgroup symmetry tree. The temperature dependence of the magnetic susceptibility agrees with Curie-Weiss behaviour (μ eff  = 4.70 μ B ,Θ = −1.3 K).

Kristallstruktur und Eigenschaften von Chrom(II)-Tetrachloroaluminat/Crystal Structure and Properties of Chromium(II)-Tetrachloroaluminate