title: Iodosyl pentafluoride
text: # Iodosyl pentafluoride
  
  Iodosyl pentafluoride is an inorganic compound of iodine, fluorine, and oxygen with the chemical formula $IOF_5.$
  
  ## Synthesis
  
  * Reaction of iodine heptafluoride with water.
  
         $IF_7$ + $H_2O$ → $IOF_5$ + 2HF
  * Reaction of iodine heptafluoride with silicon dioxide:
  
         $2IF_7$ + $SiO_2$ → $2IOF_5$ + $SiF_4$
  
  ## Physical properties
  
  Iodosyl pentafluoride forms colorless liquid. The molecule of $IOF_5$ is a distorted octahedron O=I(F4)–F. Its melting point 4.5 °C.
  
  ## Chemical properties
  
  The compound reacts with graphite to form a black graphite intercalation compound. Iodosyl pentafluoride also forms adducts with arsenic pentafluoride and antimony pentafluoride.
  
  