Tungsten tetrachloride

Tungsten tetrachloride is a dark brown solid, its physical characteristics are as follows: formula WCl4, molecular weight 325.65, density: 4.62g/ml. Tungsten tetrachloride’s hygroscopicity is not strong than tungsten pentachloride, but in the water it hydrolysis immediately. Even heating is not melting and sublimation, but if in a vacuum can be broken down when heated to reach the melting point. Tungsten tetrachloride synthesis processes are as follows:
1. Putting 20-25g tungsten hexachloride (making tungsten hexachloride excess 1-2g) and the calculated amount of an aluminum foil into boron silicate glass tube having a diameter of 30mm.
2. Then vacuum the reaction tube and closed. reaction tube at 475 ℃ heat preservation, containing tungsten hexachloride is maintained at 225 ℃.
3. After 48 hours reaction, the resulting tungsten tetrachloride can spread to the low temperature of the tube, setting out the rough crystal deposits.
4. During the reaction generated  excess tungsten hexachloride and aluminum chloride, which should be removed by heating the tube containing crystalline powder at 225 ℃, holding the other end of tube remain the room temperature. Then, open the reaction tube in a dry box to remove the tungsten tetrachloride.

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