Selenoyl fluoride
Selenoyl fluoride, also called selenoyl difluoride or selenium oxyfluoride, is a chemical with the formula SeO2F2. It exists as a gas at room temperature and has a distorted tetrahedral shape. Important structural features include an O-Se-O angle of about 126°, O-Se-F angles around 108°, and F-Se-F angles around 94°. The Se–F bond length is about 1.685 Å, and the Se–O bond length is about 1.575 Å.
How it forms: It can be made by reacting warm fluorosulfonic acid with barium selenate or with selenic acid. It can also be produced from SeO3 and SeF4 to yield this gas along with other oxyfluorides.
Reactivity: Selenoyl fluoride is more reactive than sulfuryl fluoride and is easier to hydrolyze and reduce. It can react violently with ammonia.
Reactions: It can react with xenon difluoride to form FXeOSeF5.
Physical properties: Molar mass 148.95 g/mol; melting point −99.5 °C; boiling point −8.4 °C.
Related compounds include SeF6 and SeO3.
This page was last edited on 3 February 2026, at 05:07 (CET).