Potassium osmate

Potassium osmate
Names
	Other names Potassium osmate(VI) dihydrate
Identifiers
CAS Number	10022-66-9;
3D model (JSmol)	Interactive image;
ChemSpider	21241360;
ECHA InfoCard	100.157.189
EC Number	243-247-1;
PubChem CID	53393272;
UNII	5M2BWQ2TYJ ;
CompTox Dashboard (EPA)	DTXSID80693853 ;
	InChI InChI=1S/2K.4H2O.2O.Os/h;;41H2;;;/q2+1;;;;;2*-1;+4/p-4 Key: DDTIHYGDUUGVNU-UHFFFAOYSA-J;
	SMILES [K+].[K+].[O-][Os](O)(O)(O)(O)[O-];
Properties
Chemical formula	H4K2O6Os
Molar mass	368.42
Appearance	purple solid
Hazards
GHS pictograms
GHS Signal word	Danger
GHS hazard statements	H301, H311, H330, H331
GHS precautionary statements	P260, P261, P264, P270, P271, P280, P284, P301+310, P302+352, P304+340, P310, P311, P312, P320, P321, P322, P330, P361, P363, P403+233, P405, P501
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
	Infobox references

Potassium osmate is the inorganic compound with the formula K₂[OsO₂(OH)₄]. This diamagnetic purple salt contains osmium in the VI (6+) oxidation state.[1] When dissolved in water a pink solution is formed but when dissolved in methanol, the salt gives a blue solution.[1] The salt gained attention as a catalyst for the asymmetric dihydroxylation of olefins.[2]

Structure

The complex anion is octahedral. Like related d² dioxo complexes, the oxo ligands are trans.[3] The Os=O and Os-OH distances are 1.75(2) and 1.99(2) Å, respectively. It is a relatively rare example of a metal oxo complex that obeys the 18e rule.

Preparation

The compound was first reported by Edmond Frémy in 1844.[4]

Potassium osmate is prepared by reducing perosmates using alcohol:[5]

2 OsO₄ + C₂H₅OH + 3 KOH → CH₃CO₂K + 2 K₂[OsO₂(OH)₄]

Alkaline oxidative fusion of osmium metal also affords this salt.[1]

References

F. Albert Cotton; Geoffrey Wilkinson (1966). Advanced Inorganic Chemistry: A Comprehensive Treatise. p. 1007.
Li, Guigen; Chang, Han-Ting; Sharpless, K. Barry (1996). "Catalytic Asymmetric Aminohydroxylation (AA) of Olefins". Angew. Chem. Int. Ed. Engl. 35: 451–4. doi:10.1002/anie.199604511.CS1 maint: uses authors parameter (link)
R. K. Murmann, C. L. Barnes "Redetermination of the crystal structure of potassium trans-(dioxo)-tetra(hydroxo)osmate(VI), K₂[Os(OH)₄(O)₂]" Z. Kristallogr. NCS 217, 2002, pp. 303–304. doi:10.1524/ncrs.2002.217.jg.303
Frémy, E. "Ueber das Osmium" Journal für Praktische Chemie 1844 vol.33, 406-416. doi: 10.1002/prac.18440330160
John M. Malin (1980). "Potassium Tetrahydroxodioxoosmate(VI) and trans-Bis(Ethylenediamine)Dioxoosmium(VI) Chloride". Inorganic Syntheses. 20: 61–63. doi:10.1002/9780470132517.ch18.

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.

[candw-1] F. Albert Cotton; Geoffrey Wilkinson (1966). Advanced Inorganic Chemistry: A Comprehensive Treatise. p. 1007.

[2] Li, Guigen; Chang, Han-Ting; Sharpless, K. Barry (1996). "Catalytic Asymmetric Aminohydroxylation (AA) of Olefins". Angew. Chem. Int. Ed. Engl. 35: 451–4. doi:10.1002/anie.199604511.CS1 maint: uses authors parameter (link)

[3] R. K. Murmann, C. L. Barnes "Redetermination of the crystal structure of potassium trans-(dioxo)-tetra(hydroxo)osmate(VI), K₂[Os(OH)₄(O)₂]" Z. Kristallogr. NCS 217, 2002, pp. 303–304. doi:10.1524/ncrs.2002.217.jg.303

[4] Frémy, E. "Ueber das Osmium" Journal für Praktische Chemie 1844 vol.33, 406-416. doi: 10.1002/prac.18440330160

[5] John M. Malin (1980). "Potassium Tetrahydroxodioxoosmate(VI) and trans-Bis(Ethylenediamine)Dioxoosmium(VI) Chloride". Inorganic Syntheses. 20: 61–63. doi:10.1002/9780470132517.ch18.