| Wohler and Rodewald, applying to the production of the subiodide the method already described under the subfluoride and the subchloride, heated together atomic proportions of calcium and iodine in a steel tube at 800° C. When the product was rapidly cooled in solid carbon dioxide and washed with carbon disulphide, brown hygroscopic crystals of CaCa2I or Ca2I2, were obtained. Slow cooling resulted in the formation of a mixture of calcium iodide and metallic calcium. |