|Jmol-3D images||Image 1|
|Molar mass||350.79 g/mol|
|Appearance||bright yellow crystalline solid|
|Melting point||≈ 300 °C (in chlorine)|
|Boiling point||390 °C|
|Solubility in water||soluble, but rather slow hydrolysis|
|Solubility||very soluble in hydrochloric acid and thionyl chloride, moderately soluble in ethanol and acetone, decomposes in dilute nitric acid|
|Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)|
Polonium tetrachloride (also known as polonium(IV) chloride) is a chemical compound with the formula PoCl4. It is a hygroscopic bright yellow crystalline solid at room temperature. Above 200 °C, it tends to decompose into polonium dichloride and excess chlorine, similar to selenium tetrachloride and tellurium tetrachloride.
Polonium tetrachloride is bright yellow at room temperature. At its melting point (300 °C), it becomes straw yellow, and at its boiling point (390 °C), it becomes scarlet. Its vapours are purple-brown until 500 °C, when they turn blue-green.
Polonium tetrachloride may be prepared by:
- halogenation of polonium dioxide with dry hydrogen chloride, gaseous thionyl chloride, or phosphorus pentachloride;
- dissolving of polonium metal in hydrochloric acid;
- heating polonium dioxide to 200 °C in carbon tetrachloride vapour;
- reaction of polonium metal with dry chlorine gas in 200 °C.