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Names | |||
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Other names
Thiophosphoryl tribromide
Phosphorus thiobromide Phosphorothioic tribromide | |||
Identifiers | |||
3D model (JSmol)
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ChemSpider | |||
ECHA InfoCard | 100.021.367 | ||
EC Number |
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PubChem CID
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CompTox Dashboard (EPA)
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Properties | |||
PSBr3 | |||
Molar mass | 302.75 g·mol−1 | ||
Appearance | yellow crystals[1][2] | ||
Density | 2.85 g cm−3[2] | ||
Melting point | 37.8 °C (100.0 °F; 310.9 K) | ||
Boiling point | 212 °C (414 °F; 485 K) decomposes[2] | ||
Structure[3] | |||
Cubic | |||
Pa3, No. 205 | |||
a = 11.03 Å, b = 11.03 Å, c = 11.03 Å
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Tetrahedral at the P atom | |||
Related compounds | |||
Related compounds
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Thiophosphoryl bromide is an inorganic compound with the formula PSBr3.[1]
Thiophosphoryl bromide can be prepared by heating phosphorus tribromide with phosphorus pentasulfide, or with elemental sulfur in an inert atmosphere at 130 °C.[4]
Thiophosphoryl bromide is one product of the bromination of P4S7 in cold carbon disulfide:[1]
Thiophosphoryl bromide has tetrahedral molecular geometry and C3v molecular symmetry. According to gas electron diffraction, the phosphorus–sulfur bond length is 1.895 Å and the phosphorus–bromine bond length is 2.193 Å, while the S=P−Br bond angle is 116.2° and the Br−P−Br bond angle is 101.9°.[5]
Thiophosphoryl bromide is soluble in carbon disulfide, chloroform and diethyl ether.[4]
Like other phosphoryl and thiophosphoryl halides,[1] thiophosphoryl bromide readily hydrolyses, undergoes nucleophilic substitution and forms adducts with Lewis acids.[6] Reaction with lithium iodide generates the mixed thiophosphoryl halides PSBr2I and PSBrI2 but not thiophosphoryl iodide, PSI3.[7] Thiophosphoryl bromide is of use in organic synthesis for reducing sulfoxides to thioethers,[8] and sulfines to thioketones.[9]