Polonium tetrachloride
| Names | |
|---|---|
| Systematic IUPAC name
Polonium tetrachloride | |
| Identifiers | |
| 10026-02-5 | |
| ChemSpider | 4896024  |
| |
| Jmol-3D images | Image |
| |
| Properties | |
| PoCl4 | |
| Molar mass | 350.79 g/mol[1] |
| Appearance | bright yellow crystalline solid[2] |
| Melting point | ≈ 300 °C (in chlorine)[1][2] |
| Boiling point | 390 °C (734 °F; 663 K)[1][2] |
| soluble, but rather slow hydrolysis[1] | |
| Solubility | very soluble in hydrochloric acid and thionyl chloride, moderately soluble in ethanol and acetone, decomposes in dilute nitric acid[1] |
| Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa) | |
| Infobox references | |
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.[1] Above 200 °C, it tends to decompose into polonium dichloride and excess chlorine, similar to selenium tetrachloride and tellurium tetrachloride.[2]
Structure
Polonium tetrachloride is either monoclinic or triclinic.[1]
Appearance
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.[1][2]
Preparation
Polonium tetrachloride may be prepared by:
- halogenation of polonium dioxide with dry hydrogen chloride, gaseous thionyl chloride, or phosphorus pentachloride;[1][2]
- dissolving of polonium metal in hydrochloric acid;[1]
- heating polonium dioxide to 200 °C in carbon tetrachloride vapour;[1]
- reaction of polonium metal with dry chlorine gas in 200 °C.[1]
Chemistry
Polonium tetrachloride forms a complex with two moles of tributyl phosphate.[1]
Like selenium tetrachloride and tellurium tetrachloride, polonium tetrachloride forms PoCl−
5 and PoCl2−
6 halogen complexes.[2]
References
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