title: Iodine trifluoride dioxide
text: # Iodine trifluoride dioxide
  
  Iodine trifluoride dioxide is an inorganic compound of iodine, fluorine, and oxygen with the chemical formula $IO_2F_3.$ The compound was first obtained by Engelbrecht and Petersy in 1969.
  
  ## Synthesis
  
  Iodine trifluoride dioxide may be formed by the reaction of $HOIOF_4$ and oleum.
  
  ## Physical properties
  
  Iodine trifluoride dioxide forms yellow crystals, which melt at 41 °C. Decomposes under direct sunlight or heating.
  
  The molecules in the crystals are dimers. The compound is monomeric above 100 °C.
  
  ## Chemical properties
  
  Iodine trifluoride dioxide decomposes when heated:
  
         $2IO_2F_3$ → $2IOF_3$ + $O_2$
  