Tungsten dichloride is a pale-gray amorphous powder with chemical formula of WCl2, molecular weight of 254.76, CAS No. of 13470-12-7, and density of 5.436g/cm3. WCl2 is easy to form a regular octahedron group. And it is mainly applied in the field of new materials as raw material.
Properties
1. Very unstable in the air, and easily oxidized.
2. Dissolved in hydrochloric acid (HCL), ethanol (C₂H₅OH) and ether (C4H10O).
3. Saved in excess hydrogen chloride.
4. Decomposed at the temperature of 500°C, also be oxidized by water, releasing hydrogen during a violent reaction with water.
Producing Methods
1. In sodium tetrachloroaluminate solution, obtained by the reduction between aluminum (Al) and tungsten hexachloride (WCl6).
2. At the temperature range of 400~450°C, obtained by the disproportionation of tungsten tetrachloride (WCl4) in a vacuum tight borosilicate glass tube.
Place WCl4 into one end of the tube, and heat to 450-500°C. Keep the other end of the tube at room temperature. As the reaction proceeds, WCl4 condensed on the cold end of the tube, thereby separating WCl2. The reaction is as follows:
3WCl4 (s) → WCl2 (s) + 2WCl5 (g).
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