Rhenium(III) bromide

Names
Other names

* Trirhenium nonabromide
* Rhenium tribromide

Identifiers

CAS Number

* 13569-49-8 Y

3D model (JSmol)

* Interactive image

ChemSpider |

* 15750935

EC Number |

* 236-984-5

PubChem CID

* 83579

InChI

* InChI=1S/3BrH.Re/h3*1H;/q;;;+3/p-3

SMILES

* Br[Re](Br)Br

Properties

Chemical formula

| Re3Br9
Molar mass | 425.92 g/mol
Appearance  | Black lustrous solid[1]
Melting point |  500 °C (932 °F; 773 K)[2] (sublimes)
Solubility | Sparingly soluble in ether and acetone, reacts with methanol and ammonia[1]
Structure

Molecular shape

| Trimeric
Thermochemistry

Std enthalpy of
formation (ΔfH⦵298)

| -164.4 kJ/mol[3]
Related compounds

Other anions

| Rhenium(III) chloride

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

Infobox references

Rhenium(III) bromide is a chemical compound with the formula Re3Br9. It is a black lustrous crystalline solid. This compound reacts with water to form rhenium(IV) oxide and is isostructural with rhenium(III) chloride.[1][4]

## Preparation

This compound is prepared by the reaction of rhenium metal and bromine gas at 500 °C under nitrogen:[2]

6Re + 9Br2 → 2Re3Br9

If there is oxygen in the atmosphere, it will instead form rhenium(III) oxybromide.[2]

However, the most common method of producing this compound is by first reacting potassium hexabromorhenate(IV) with silver nitrate, which forms silver hexabromorhenite(IV), then this compound is heated to 600 °C to form rhenium(III) bromide.[1][3]

K2ReBr6 \+ 2AgNO3 → Ag2ReBr6 \+ 2KNO3
6Ag2ReBr6 → 12AgBr + 3Br2 \+ 2Re3Br9

An alternative method is a thermal decomposition of rhenium(V) bromide.

## References

1. ↑ 1.0 1.1 1.2 1.3 Cite error: Invalid `<ref>` tag; no text was provided for refs named `rebr3`
2. ↑ 2.0 2.1 2.2 Harro Hagen; Adolf Sieverts (1933). "Rheniumtribromid" (in German). Zeitschrift für anorganische und allgemeine Chemie (Verlag GmbH & Co. KGaA, Weinheim) 215 (1): 111–112. doi:10.1002/zaac.19332150114.
3. ↑ 3.0 3.1 J. P. King; J. W. Cobble (1960). "The Thermodynamic Properties of Technetium and Rhenium Compounds. VII. Heats of Formation of Rhenium Trichloride and Rhenium Tribromide. Free Energies and Entropies" (in English). Journal of the American Chemical Society 82 (9): 2111–2113. doi:10.1021/ja01494a005.
4. ↑ V. V. Ugarov (1971). "Electron-diffraction investigation of the structure of the Re3Br9 molecule" (in English). Journal of Structural Chemistry 12 (2): 286–288. doi:10.1007/BF00739116.

* v
* t
* e

Rhenium compounds

Rhenium(0)|

| Organorhenium(0)|

* Re2(CO)10

|

Rhenium(I)|

| Organorhenium(I)|

* Re(CO)5Br
* ReH(CO)5

|

Rhenium(II)|

* ReB2

Rhenium(III)|

* ReCl3

Rhenium(IV)|

* ReO2
* ReS2
* ReSe2
* ReTe2

Rhenium(V)|

* ReOCl3(P(C6H5)3)2
* ReCl5

Rhenium(VI)|

* ReF6
* ReO3

Rhenium(VII)|

* ReF7
* Re2O7
* Re2S7
* Re2O7(OH2)2
* NH4ReO4
* NaReO4
* K2ReH9

| Organorhenium(VII)|

* CH3ReO3

|

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