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Iodine dioxide is a binary inorganic compound of iodine and oxygen with the chemical formula IO 2. [1] [2] Only stable as a dilute gas, [3] this compound is one of many iodine oxides, [4] [5] and "iodine dioxide" is sometimes used to describe its formal dimer, the salt diiodine tetroxide (I 2 O 4, [IO] + [IO 3] −).
Iodine pentoxide (I 2 O 5). 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.
Structurally, the compound is iodyl periodate, an iodine(V,VII) oxide approximating IO 2 + IO 4 −. [2] As a solid, the compound crystallizes in the space group P 1 (space group no. 2) with the lattice constants a = 500.6 pm, b = 674.1 pm, c = 679.5 pm, α = 97.1°, β = 96.43°, γ = 105.36° with one formula unit per unit cell.
The iodite ion, or iodine dioxide anion, is the halite with the chemical formula IO − 2. Within the ion, the iodine exists in the oxidation state of +3.
5 CO + I 2 O 5 → I 2 + 5 CO 2. This reaction can be used to analyze the concentration of CO in a gaseous sample. I 2 O 5 forms iodyl salts, [IO 2 +], with SO 3 and S 2 O 6 F 2, but iodosyl salts, [IO +], with concentrated sulfuric acid. Iodine pentoxide decomposes to iodine (vapor) and oxygen when heated to about 350 °C. [4]
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