Selenium tetrafluoride

Selenium tetrafluoride, also known as selenous fluoride and selenium(IV) fluoride, is a chemical compound. Its chemical formula is SeF4. It contains selenium in its +4 oxidation state. It also contains fluoride ions.
Properties.
It is a colorless liquid. It hydrolyses in water giving hydrofluoric acid and selenous acid. It is used to add fluoride to other chemical compounds. 
Preparation.
It is made by reacting selenium with a little fluorine. A lot of fluorine makes selenium hexafluoride. It can also be made by reacting sulfur tetrafluoride with selenium dioxide.
Uses.
It is used to make adducts and some other chemical reactions like that.