Osmium iodides

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Osmium iodide refers to compounds of osmium with the formula OsIn. Several have been mentioned in the literature, but only the triiodide has been verified by X-ray crystallography.[1][2]

Osmium(I) iodide

Osmium(I) iodide is the iodide of osmium with the formula OsI. It is a metallic grey solid produced by the reaction of

amorphous.[2]

Osmium(II) iodide

Osmium(II) iodide is the iodide of osmium with the formula OsI2. It is a black solid[3] produced by the reaction of osmium tetroxide and hydroiodic acid at 250 °C in nitrogen:[2]

OsO4 + HI → OsI2 + H2O

This compound decomposes in contact with water.[3]

Osmium(III) iodide

Osmium(III) iodide is the iodide of osmium with the formula OsI3. This black solid is produced by heating hexaiodoosmic acid(H2OsI6).[2] This compound is insoluble in water.[3]

Osmium(IV) iodide

What was claimed to be osmium(IV) iodide was produced by the reaction of

osmic acid (H4OsO6) and hydroiodic acid.[4] However on attempted reproduction, this substance was found to be dihydroxonium hexaiodoosmate ((H3O+)2OsI62–). When heated this did not form a tetraiodo compound, and instead formed mono, di, and tri-iodo osmium compounds.[2]

References

  1. ISBN 9781119951438
    .
  2. ^
    doi:10.1039/JR9620002113
    .
  3. ^
    ISBN 9780199742196
    . Retrieved 11 November 2021.
  4. doi:10.1038/scientificamerican04291893-14453supp
    .
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