Osmium iodides
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
[edit]Osmium(I) iodide is the iodide of osmium with the formula OsI. It is a metallic grey solid produced by the reaction of osmium tetroxide and hydroiodic acid heated in a water bath for 48 hours in a carbon dioxide atmosphere. This compound is amorphous.[2]
Osmium(II) iodide
[edit]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
[edit]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
[edit]What was claimed to be osmium(IV) iodide was produced by the reaction of osmic acid (OsO2•2H2O) 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
[edit]- ^ Köhler, J. (2014). "Halides: Solid-State Chemistry". Encyclopedia of Inorganic and Bioinorganic Chemistry. pp. 1–22. doi:10.1002/9781119951438.eibc0078.pub2. ISBN 9781119951438.
- ^ a b c d e Fergusson, J. E.; Robinson, B. H.; Roper, W. R. (1962). "405. Iodides of osmium and rhenium". Journal of the Chemical Society (Resumed): 2113. doi:10.1039/JR9620002113.
- ^ a b c George K. Schweitzer; Lester L. Pesterfield (2009). The Aqueous Chemistry of the Elements (Ebook). Oxford University Press. p. 321. ISBN 9780199742196. Retrieved 11 November 2021.
- ^ "The Chemistry of Osmium". the Sciences. Vol. 35, no. 904supp. Scientific American. 1893. pp. 14453–14454. doi:10.1038/scientificamerican04291893-14453supp.