Anhydrous Thorium Bromide

Zirconium tetrabromide is a white microcrystalline salt which is very hygroscopic. It dissolves in water with the liberation of heat, forming zirconyl bromide. The tetrabromide is also soluble in certain organic solvents, such as alcohol and ether. It reacts with ammonia at low temperature to form ammines. 

Honigschmidt, Zintl, and Gonzalez Z. anorg. allgem. Chem., 139, 293 

Submitted by R. C. Youngs and Hewitt G. Fletcher Checked by F. ToiGof and W. C. Johnson  

The method described below for the preparation of thorium bromide combines the method of Troost and Ouvrard3 with that of Moissan and Martinsen.2 The former passed bromine over a heated mixture of thorium dioxide and carbon but did not purify the thorium bromide formed. The latter prepared the halide by the action of bromine on heated thorium carbide and purified the product by sublimation, first in a current of hydrogen and 

Considerable thorium bromide is carried along with the nitrogen, even through the protecting tube of calcium chloride, if the flow of nitrogen through the apparatus is too fast. As the reaction proceeds, the thorium bromide collects at the end of the silica tube as a powder and in large 

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Tellurium hexafluoride, 121 Tetrabromosilane, 38, 40 Tetrapyridino-ferrous chloride, 184 Thiocyanogen solution, 84, 86 standardization, 86 Thionyl bromide, 113 Thorium bromide, ammines, 54 anhydrous, 51... 

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