Thiophosphoryl bromide

Thiophosphoryl bromide  |

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Names
Other names

Thiophosphoryl tribromide
Phosphorus thiobromide
Phosphorothioic tribromide

Identifiers

CAS Number

* 3931-89-3 Y

3D model (JSmol)

* Interactive image

ChemSpider |

* 69937

EC Number |

* 223-502-3

PubChem CID

* 77530

InChI

* InChI=1S/Br3PS/c1-4(2,3)5

Key: OWNZHTHZRZVKSQ-UHFFFAOYSA-N

SMILES

* S=P(Br)(Br)Br

Properties

Chemical formula

| PSBr

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]

Crystal structure

| Cubic

Space group

| Pa3, No. 205

Lattice constant

a = 11.03 Å, b = 11.03 Å, c = 11.03 Å

Related compounds

Related compounds

* Phosphorus tribromide
* Phosphoryl bromide
* Thiophosphoryl fluoride
* Thiophosphoryl chloride
* Thiophosphoryl iodide
* Phosphorothioic chloride difluoride

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Infobox references

Tracking categories (test):

* PairSizeSet

Thiophosphoryl bromide is an inorganic compound with the formula PSBr
3.[1]

## Contents

* 1 Preparation
* 2 Structure and properties
* 3 Reactions
* 4 References

## Preparation

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 P

7 in cold carbon disulfide:[1]

1.5 P

7 \+ 6 Br
2 → PBr
3 \+ PSBr
3 \+ P

6Br
2 \+ P

5Br

## Structure and properties

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]

## Reactions

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 PSBr
2I and PSBrI
2 but not thiophosphoryl iodide, PSI
3.[7] Thiophosphoryl bromide is of use in organic synthesis for reducing sulfoxides to thioethers,[8] and sulfines to thioketones.[9]

## References

1. ↑ 1.0 1.1 1.2 1.3 Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. pp. 501–503. ISBN 978-0-08-037941-8.
2. ↑ 2.0 2.1 2.2 William M. Haynes, ed (2016). CRC Handbook of Chemistry and Physics (97th ed.). CRC Press. p. 4-78. ISBN 978-1498754293.
3. ↑ ICSD Entry: 39130. Cambridge Crystallographic Data Centre. https://www.ccdc.cam.ac.uk/structures/Search?Ccdcid=1609154&DatabaseToSearch=Published. Retrieved 2022-10-30.
4. ↑ 4.0 4.1 Arthur D. F. Toy (1975). The Chemistry of Phosphorus. Permanon Texts in Inorganic Chemistry. 3. Permanon Press. p. 438. ISBN 9781483139593.
5. ↑ Jacob, E. Jean; Danielson, Donald D.; Samdal, Svein (1980). "An electron diffraction determination of the molecular structures of phosphoryl bromide and thiophosphoryl bromide". J. Mol. Struct. 62 (2): 143–155. doi:10.1016/0022-2860(80)85232-X. Bibcode: 1980JMoSt..62..143J.
6. ↑ van der Veer, W.; Jellinek, F. (1970). "Adducts of thiophosphoryl compounds with metal halides. Part III: Addition compounds of phosphoryl bromide and thiophosphoryl bromide". Recl. Trav. Chim. Pays-Bas 89 (8): 833–844. doi:10.1002/recl.19700890809.
7. ↑ Dillon, K. B.; Craveirinha Dillon, M. G.; Waddington, T. C. (1977). "The identification of some new thiophosphoryl compounds containing P–I bonds by means of 31P N.M.R. spectroscopy". Inorg. Nucl. Chem. Lett. 13 (8): 349–353. doi:10.1016/0020-1650(77)80109-8.
8. ↑ Still, I. W. J.; Reed, J. N.; Turnbull, K. (1979). "Thiophosphoryl bromide: a new reagent for the reduction of sulfoxides to sulfides". Tetrahedron Lett. 20 (17): 1481–1484. doi:10.1016/S0040-4039(01)86183-9.
9. ↑ Kuipers, J. A. M.; Lammerink, B. H. M.; Still, I . W. J.; Zwanenburg, B. (1981). "Phosphorus Pentasulfide and Thiophosphoryl Bromide: Facile Reagents for the Reduction of Sulfines to Thiones". Synthesis 1981 (4): 295–297. doi:10.1055/s-1981-29423. https://research.utwente.nl/en/publications/phosphorus-pentasulfide-and-thiophosphoryl-bromide-facile-reagents-for-the-reduction-of-sulfines-to-thiones(807b64c5-6275-40f9-8560-c76f81c41a96).html.

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*[CID]: Compound ID