Potassium hexachloroosmate

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Potassium hexachloroosmate
K2OsCl6 in an evaporating dish
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.037.160 Edit this at Wikidata
EC Number
  • 240-893-6
UNII
  • InChI=1S/6ClH.2K.Os/h6*1H;;;/q;;;;;;2*+1;+4/p-6
    Key: VGKQJCSDERXWRV-UHFFFAOYSA-H
  • [Cl-].[Cl-].[Cl-].[Cl-].[Cl-].[Cl-].[K+].[K+].[Os+4]
Properties
K2OsCl6
Molar mass 481.13 g/mol
Appearance Dark red to black solid
Density 2.03 g/cm3
slightly soluble
Hazards
GHS labelling:
GHS05: CorrosiveGHS06: Toxic GHS07: Exclamation mark
Danger
H301, H302, H311, H314, H331, H335
P260, P262, P264, P264+P265, P270, P271, P280, P301+P316, P301+P317, P301+P330+P331, P302+P352, P302+P361+P354, P304+P340, P305+P354+P338, P316, P317, P319, P321, P330, P332+P317, P337+P317, P361+P364, P363, P403+P233, P405, P501
Related compounds
Other anions
 Potassium hexachloroplatinate,
Potassium hexachloropalladate(IV)
Other cations
 Sodium hexachloroosmate,
Ammonium hexachloroosmate(IV),
Hexachloroosmic acid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Potassium hexachloroosmate is an inorganic chemical compound with the chemical formula K2OsCl6. It is a darkly colored solid with limited solubility in water.

Crystals of K2OsCl6 viewed under a microscope

Potassium hexachloroosmate forms dark red octahedral crystals of the space group Fm3m, which produce a dark yellow color when dissolved in water. The crystal structure is isomorphic to the corresponding cations of palladium, platinum, and iridium. It is slightly soluble in water, and is insoluble in saline solutions as well as alcohol.[1][2]

Potassium hexachloroosmate is most stable in acidic solutions, although with nitric acid it reacts to form osmium tetroxide. It slowly hydrolyses in water yielding osmium dioxide, and in strong alkali it also decomposes to the dioxide.[3][4]

Synthesis

Reactions

References

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