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Iodine dioxide

( Iodine Compounds )

Compounds Diiodine Dioxide Iodine

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Iodine dioxide is a binary inorganic compound of iodine and oxygen with the chemical formula .

(2015). 9780128011461, Gulf Professional Publishing. . ISBN 9780128011461

(2016). 9781439880500, CRC Press. . ISBN 9781439880500

Only stable as a dilute gas, this compound is one of many ,

(2025). 9788122413847, New Age International. . ISBN 9788122413847

and "iodine dioxide" is sometimes used to describe its formal dimer, the salt diiodine tetroxide (I₂O₄, IO⁺IO₃⁻).

It is formed, in parts-per-trillion quantities, at the marine boundary layer and believed to mediate particulate nucleation therein. The iodine, originally from algaeic diiodomethane, is photooxidation to iodine monoxide, which then disproportionates to free iodine atoms and iodine dioxide. At a sufficiently large concentration, the particles then combine to form small grains of diiodine tetroxide.