Iodine oxide

Source: Wikipedia, the free encyclopedia.
Iodine pentoxide (I2O5)

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.[1]

Iodine oxides[2]
Molecular formula
 I2O IO[3] IO2 I2O4 I2O5 I4O9
Name diiodine oxide iodine monoxide iodine dioxide iodine tetroxide

(diiodine tetroxide)

Iodine pentoxide

(diiodine pentoxide)

tetraiodine nonoxide
Structure I2O IO IO2 (IO2)2 O(IO2)2 I(OIO2)3
Molecular model
CAS registry
 39319-71-6 14696-98-1 13494-92-3 1024652-24-1 12029-98-0 66523-94-2
Appearance Unknown purple gas yellow solid yellow solid white crystalline solid dark yellow solid
Oxidation state +1 +2 +4 +3 and +5 +5 +3 and +5
Melting point not isolable not isolable not isolable decomp. 100 °C decomp. 300–350 °C decomp. 75 °C
Specific gravity
 4.2 4.8
Solubility in water decomp. to HIO3 + I2 187 g/100 mL decomp. to HIO3 + I2

Diiodine monoxide has largely been the subject of theoretical study,[4] but there is some evidence that it may be prepared in a similar manner to dichlorine monoxide, via a reaction between HgO and I2.[5] The compound appears to be highly unstable but can react with alkenes to give halogenated products.[6]

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.[7][8] Despite the small quantities produced (typically below ppt) they are thought to be powerful ozone depletion agents.[9][10]

oxoacid
.

Tetraiodine nonoxide (I4O9) has been prepared by the gas-phase reaction of I2 with O3 but has not been extensively studied.[11]

Iodate anions

Iodine oxides also form negatively charged

iodates and periodates
.

Their

conjugate acids
are:

Iodine oxidation state −1 +1 +3 +5 +7
Name Hydrogen iodide* Hypoiodous acid
Iodous acid
 Iodic acid Periodic acid
Formula HI HIO HIO2 HIO3 HIO4 or H5IO6

 • The -1 oxidation state, hydrogen iodide, is not an oxide, but it is included in this table for completeness.

The periodates include two variants: metaperiodate IO−
4 and orthoperiodate IO5−
6.

See also

References

  1. PMID 18350176
    .
  2. ISBN 0-8493-0486-5
    .
  3. S2CID 250898175
    .
  4. doi:10.1002/(SICI)1098-1071(1998)9:4<383::AID-HC6>3.0.CO;2-9
    .
  5. doi:10.1039/P19740002350
    .
  6. doi:10.1039/P19760001961
    .
  7. doi:10.1029/2000GL012399
    .
  8. doi:10.1038/ngeo1687
    .
  9. hdl:11336/100317
    .
  10. S2CID 128402214
    .
  11. doi:10.1002/jrs.1250160611
    .
Retrieved from "https://en.wikipedia.org/w/index.php?title=Iodine_oxide&oldid=1193278679"