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Sodium hexachloroosmate
Chemical compound From Wikipedia, the free encyclopedia
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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
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Hexachloroosmate is paramagnetic, with a low-spin d4 configuration.
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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.
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References
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