Sodium hexachloroosmate

Chemical compound From Wikipedia, the free encyclopedia

Sodium hexachloroosmate is the inorganic compound with the formula Na2OsCl6. A red solid, it is the disodium salt of the osmium(IV) complex [OsCl6]2−. The anion is an octahedral complex with Os-Cl distance of 2.325(3) Å, as established by X-ray crystallography.[1] The compound can be prepared by reaction of a suspension of osmium metal in molten sodium chloride with chlorine:[2]

Os + 2 NaCl + 2 Cl2 → Na2OsCl6
Quick facts Identifiers, Properties ...
Sodium hexachloroosmate
Two-dimensional representation of disodium hexachloroosmate salt
A solution of sodium hexachloroosmate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.013.775 Edit this at Wikidata
  • monohydrate: InChI=1S/6ClH.2Na.H2O.Os/h6*1H;;;1H2;/q;;;;;;2*+1;;+4/p-6
    Key: PQSWAUXOSHGRPF-UHFFFAOYSA-H
  • anhydrous: InChI=1S/6ClH.2Na.Os/h6*1H;;;/q;;;;;;2*+1;+4/p-6
    Key: PVTVRPSPEDISMV-UHFFFAOYSA-H
  • monohydrate: O.[Na+].[Na+].Cl[Os-2](Cl)(Cl)(Cl)(Cl)Cl
  • anhydrous: [Na+].[Na+].[Cl-].[Cl-].Cl[Os](Cl)(Cl)Cl
Properties
Cl6Na2Os
Molar mass 448.91 g·mol−1
Appearance red solid
Density 3.221 g/cm3
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Close

Hexachloroosmate is paramagnetic, with a low-spin d4 configuration.

Reactions

Sodium hexachloroosmate reacts with a solution of ammonium chloride to produce ammonium hexachloroosmate(IV). Upon exposure to strong alkali, hexachloroosmates will decompose to osmium dioxide. They react with excess ammonia to form so-called osmium diammine hydroxide, OsO(NH3)2(OH)2 [3][4]

Sodium hexachloroosmate reacts with triphenylphosphine to form various complexes. When a solution of sodium hexachloroosmate and formalin is added to a boiling solution of triphenylphosphine in 2-methoxyethanol, OsHCl(CO)(PPh3)3 is formed.[5]

Na2OsCl6•6H2O + 3(C6H5)3P formalin
———→ OsHCl(CO)[P(C6H5)3]3

With an aqueous solution containing potassium hydroxide and formaldehyde they react to produce OsH2(CO)(PPh3)3.[5]

Na2OsCl6•6H2O + 3(C6H5)3P koh hcho
———→ OsH2(CO)[P(C6H5)3]3

With ethanol and sodium borohydride they react to produce OsH4[P(C6H5)3]3.[5]

Na2OsCl6•6H2O + 3(C6H5)3P borohydride
————→ OsH4[P(C6H5)3]3

With 2-methoxyethanol and n-methyl-n-nitrosotoluene sulfonamide they react to yield OsCl3(NO)[P(C6H5)3]2.[5]

Na2OsCl6•6H2O + 2(C6H5)3P + p-TolSO2N(NO)(CH3) → OsCl3(NO)[P(C6H5)3]2.

References

Related Articles

Wikiwand AI