Selenium trioxide

• Se ( VI) oxide
• Selensäureanhydrid

Colorless solid

Liquid

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Selenium trioxide is an inorganic chemical compound of the selenium from the group of oxides.

Production and representation

Selenium trioxide may be obtained by reaction of sulfur trioxide with potassium selenate.

Properties

Selenium trioxide is a colorless solid which reacts with water under strong heating to selenium acid. It dissolves in acetic anhydride and liquid sulfur dioxide. He has no defined boiling point, but starts from about 100 ° C. under atmospheric pressure slowly sublimate and decomposes above 180 ° C. The oxidizing power of the connection is so strong that alcohol is ignited even at -80 ° C. It consists of eight-membered ring molecules Se4O12. In the gas phase of this tetramer is in equilibrium with monomeric selenium trioxide.

Use

Selenium trioxide is suitable for gentle Selenonierung of hydrocarbons.