GOLD(III) BROMIDE Property

Melting point:

160°C (dec.)

storage temp. 

under inert gas (nitrogen or Argon) at 2–8 °C

solubility 

H2O: slightly soluble(lit.)

form 

Powder

color 

orange to brown

Water Solubility 

Slightly soluble in water.

Sensitive 

moisture sensitive

CAS DataBase Reference

10294-28-7(CAS DataBase Reference)

EPA Substance Registry System

Gold bromide (AuBr3) (10294-28-7)

Safety

Hazard Codes 

C

Risk Statements 

34

Safety Statements 

26-36/37/39-45

RIDADR 

UN 3260 8/PG 3

WGK Germany 

3

F 

8-10-23

TSCA 

Yes

HazardClass 

8

PackingGroup 

III

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H314Causes severe skin burns and eye damage

Precautionary statements

P280Wear protective gloves/protective clothing/eye protection/face protection.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

P310Immediately call a POISON CENTER or doctor/physician.

GOLD(III) BROMIDE Chemical Properties,Usage,Production

Chemical Properties

Yellowish-gray mass. Decomposes at approximately 165C. Insoluble in water.

Uses

Gold(III) bromide is used as a catalyst in a variety of reactions. It catalyzes the reaction between an enynal unit and carbonyl compounds to form a six-membered cyclic compound. Another catalytic use of gold tribromide is in the nucleophilic substitution reaction of propargylic alcohols, with the gold complex acting as an alcohol-activating agent to facilitate the substitution. It can be used as a testing reagent for the presence of ketamine.

Uses

Analysis (testing for alkaloids, spermatic fluid), medicine.

Definition

Brownish-black powder. Mp 160C with decomposition. Soluble in water and alcohol.

Purification Methods

Purify it by adding pure Br2 to the dark powder, securely stopper the container, warm a little and shake while keeping away from light for ca 48hours. Remove the stopper and place it over NaOH until free Br2 is no longer in the apparatus (48-60hours). The bright yellow needles of the tribromide are stable over NaOH in the dark. It is soluble in H2O and in EtOH where it is slowly reduced. Keep it in a cooled, closed container and protect it from light as decomposition causes free gold to be formed. Aurobromic acid can be obtained by adding the calculated amount of conc HBr to AuBr3 (actually Au2Br6) until all dissolves, whereby the acid crystallises out as HAuBr4.5H2O; a deliquescent solid soluble in EtOH with m ca 27o, and store it as above. [Gibson & Colles J Chem Soc 2411 1931, Burawoy & Gibson J Chem Soc 217 1935, Burawoy & Gibson J Chem Soc 219 1935.]