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Oxychlorides

Several oxychlorides of chromium said to possess definite formulae, for example, Cr2Cl5O.4H2O, Cr2Cl4(OH)2, Cr2Cl6.Cr2O3, Cr2Cl2(OH)4, Cr2Cl(OH)5, Cr2O3.8CrCl3.24H2O, Cr2O3.4CrCl3.9H2O, 2Cr2O3.2CrCl3, and CrOCl.3H2O, have been described, but possibly some of them are merely physical mixtures. Basic chromium chlorochromate, Cr3O6Cl2, is known, and two compounds, (CrO2)5Cl6 and Cr6O9Cl4, obtained by the action of nitric oxide, or, in sunlight, of carbon monoxide upon chromyl chloride, CrO2Cl2, have been prepared. The former, (CrO2)5Cl6, which possesses chlorinating and oxidising properties, forms brown deliquescent crystals, and decomposes on heating to 150° C. into chromyl chloride, or, if heated rapidly, into chlorine, and Cr3O6Cl2, which remains as a solid residue. Above 180° C. it yields oxygen and a brownish-black residue of Cr6O9Cl4. The oxychloride, Cr2OCl4, is obtained by the action of hydrochloric acid on the hydroxide, Cr2O(OH)4. Another, of the formula CrOCl3, in which chromium appears to be pentavalent, forms double salts with the chlorides of the alkali metals and of certain organic bases. For instance, CrOCl3.2KCl is obtained as a red precipitate by treating with hydrogen chloride a mixture of a solution of potassium chloride and a concentrated solution of chromic acid already saturated with hydrogen chloride, and the mixture maintained at a low temperature. A compound, Cr2O5Cl2, is described as resulting from the heating of chromyl chloride with chromic anhydride in a sealed tube.

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