Osmium(V) chloride

Osmium(V) chloride is an inorganic chemical compound of osmium metal and chlorine with the chemical formula OsCl₅.^[3][4]

Osmium(V) chloride

Names
Other names pentachloroosmium, osmium pentachloride
Identifiers
CAS Number	71328-74-0
3D model (JSmol)	Interactive image
ChemSpider	4423016
PubChem CID	5257384
InChI InChI=1S/5ClH.Os/h5*1H;/q;;;;;+5/p-5 Key: UVOYHLXSTOWTCX-UHFFFAOYSA-I
SMILES Cl[Os](Cl)(Cl)(Cl)Cl
Properties
Chemical formula	Cl5Os
Molar mass	367.48 g·mol−1
Appearance	black solid
Density	4.09
Melting point	160 °C (320 °F; 433 K)
Solubility in water	soluble
Structure
Space group	P21/c[1]
Lattice constant	a = 9.17 Å, b = 11.5 Å, c = 11.97 Å α = 90°, β = 109°°, γ = 90°.[2]
Lattice volume (V)	1194 Å3
Formula units (Z)	8
Related compounds
Related compounds	Osmium pentafluoride; Rhenium pentachloride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Potential synthesis

Osmium(V) chloride can be obtained in small amounts by reacting osmium hexafluoride with excess boron trichloride:^[5]

2OsF₆ + 4BCl₃ → 2OsCl₅ + 4BF₃ + Cl₂

It can also be obtained by the action of sulfur dichloride on osmium tetroxide:^[2]

2OsO₄ + 8SCl₂ + 5Cl₂ → 2OsCl₅ + 8SOCl₂

Physical properties

Osmium(V) chloride forms a black dimeric solid, isomorphic with rhenium(V) chloride. OsCl₅ is sparingly soluble in non-polar solvents.^[2] It is soluble in POCl₃ to form a red-brown solution, which can crystallize OsCl₅·POCl₃.^[6]