II Bromide 6-Ammoniate

Fe + 2HBr — FeBr2 + H2 FeBr2 + 6NHs- FeBr2-6NH3 

Submitted bt Geobge W. Watt and W. A. Jenkins Checked bt Habbt H. SislerI and F. R. HuRLEYf 

Ammoniates of iron (II) salts have been prepared by the reaction of ammonia with iron(II) salts in solution1 or in the solid state.2 In either case, the purity of the final product has been limited by the difficulty of producing and maintaining the iron(II) salts in a high state of purity. The simple procedure outlined below, which is a modification of that described by Weitz and Muller,1 obviates these difficulties without sacrificing either yield or purity. 

The reactions are carried out in a 1-1. round-bottomed flask (Fig. 18) sealed to a dropping funnel and a gas inlet tube A.% The neck of the flask is closed with a rubber stopper bearing a gas inlet C and an outlet tube B (i.d. at least 5 mm.). The latter is connected to a filter assembly which consists of a 25-mm.-i.d. filter tube with a fritted-glass filter plate D (porosity B). The distance from the filter plate to the top of the tube should be at least 35 cm. As shown in Fig. 18, tubes B and C extend into the flask through glass sleeves and are attached to these sleeves by means of rubber tubing so that B and C may be raised or lowered. 

Nine and three-tenths grams of pure iron (0.167 mol) in the form of primary-standard iron wire (99.9% Fe) is placed in the flask, and with C attached to a source of anhydrous ammonia gas and B lowered as shown in Fig. 18, air is completely displaced from the system by means of hydrogen admitted through A. Tube B is raised, and 236 ml. of 40% 

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Iron (II) bromide 6-ammoniate is a pale blue-gray crystalline solid which decomposes to form a brown solid of undetermined composition when exposed to the atmosphere. 

F3Te Tellurium(VI) fluoride, 1 121 F(W Tungsten (VI) fluoride, 3 181 FeBr2-6NH3 Iron (II) bromide 6-ammoniate, 4 161... 

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