page_title: Iodine oxide
hierarchical_section_title: Iodine oxide
caption_attribution_description: Ball-and-stick model of the iodine pentoxide molecule, I2O5. Source for structure: Norman N. Greenwood, Alan Earnshaw (1997) Chemistry of the Elements (2nd ed.), Butterworth-Heinemann, p.&#160;851 ISBN: 0-08-037941-9.
context_page_description: Iodine oxides are chemical compounds of oxygen and iodine. Iodine has only two stable oxides which are isolatable in bulk, iodine tetroxide and iodine pentoxide, but a number of other oxides are formed in trace quantities or have been hypothesized to exist.
  The chemistry of these compounds is complicated with only a few having been well characterized. Many have been detected in the atmosphere and are believed to be particularly important in the marine boundary layer.
  Diiodine monoxide has largely been the subject of theoretical study, but there is some evidence that it may be prepared in a similar manner to dichlorine monoxide, via a reaction between HgO and I₂. The compound appears to be highly unstable but can react with alkenes to give halogenated products.
  Radical iodine oxide, iodine dioxide and iodine tetroxide all possess significant and interconnected atmospheric chemistry. They are formed, in very small quantities, at the marine boundary layer by the photooxidation of diiodomethane, which is produced by macroalga such as seaweed or through the oxidation of molecular iodine, produced by the reaction of gaseous ozone and iodide present at the seasurface.
context_section_description: Iodine oxides are chemical compounds of oxygen and iodine. Iodine has only two stable oxides which are isolatable in bulk, iodine tetroxide and iodine pentoxide, but a number of other oxides are formed in trace quantities or have been hypothesized to exist.
  The chemistry of these compounds is complicated with only a few having been well characterized. Many have been detected in the atmosphere and are believed to be particularly important in the marine boundary layer.
  Diiodine monoxide has largely been the subject of theoretical study, but there is some evidence that it may be prepared in a similar manner to dichlorine monoxide, via a reaction between HgO and I₂. The compound appears to be highly unstable but can react with alkenes to give halogenated products.
  Radical  iodine oxide (IO), iodine dioxide (IO₂) and iodine tetroxide ((IO₂)₂) all possess significant and interconnected atmospheric chemistry. They are formed, in very small quantities, at the marine boundary layer by the photooxidation of diiodomethane, which is produced by macroalga such as seaweed or through the oxidation of molecular  iodine, produced by the reaction of gaseous ozone and iodide present at the seasurface. Despite the small quantities produced (typically below ppt) they are thought to be powerful ozone depletion agents.
  Diiodine pentoxide (I₂O₅) is the anhydride of iodic acid and the only stable anhydride of an iodine oxoacid.
  Tetraiodine nonoxide (I₄O₉) has been prepared by the gas-phase reaction of I₂ with O₃ but has not been extensively studied.
caption: Iodine pentoxide (I2O5)
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