TELLURIUM TETRABROMIDE Chemical Properties

Melting point:

~380 °C(lit.)

Boiling point:

420 °C(lit.)

Density 

4.3 g/mL at 25 °C(lit.)

Flash point:

420°C

solubility 

reacts with H2O; soluble in ethyl ether

form 

beads

color 

yellow-orange monoclinic crystals, crystalline

Water Solubility 

It reacts with water and ethanol.

Sensitive 

Moisture Sensitive

Merck 

14,9125

Exposure limits

ACGIH: TWA 0.1 mg/m3
NIOSH: IDLH 25 mg/m3; TWA 0.1 mg/m3

CAS DataBase Reference

10031-27-3(CAS DataBase Reference)

EPA Substance Registry System

Tellurium bromide (TeBr4), (T-4)- (10031-27-3)

Safety Information

Hazard Codes 

C

Risk Statements 

34

Safety Statements 

22-26-27-36/37/39-45

RIDADR 

UN 3260 8/PG 2

WGK Germany 

3

TSCA 

Yes

HazardClass 

8

PackingGroup 

II

MSDS

• Language:English Provider:SigmaAldrich
• Language:English Provider:ALFA

TELLURIUM TETRABROMIDE Usage And Synthesis

Description

Tellurium tetrabromide is a iron-gray crystalline substance; stable even in moist air. Decomposes on heating, giving off I2. Hydrolyzed slowly in cold water, rapidly in warm water, forming TeO2 and HI.

Chemical Properties

Yellow crystals. Soluble in a little water (decomposes in excess water).

Uses

Tellurium tetrabromide?it acts as a chemical and organic intermediate. It is also acts a conductor.

Preparation

Pure Te (5 g.) is introduced through adapter a into the elongated reaction flask A of the apparatus shown in Fig.1. Adapter a is connected to a N2 purification train which furnishes either pure dry N2 or N2 containing bromine vapor. For the latter, the gas stream may be passed through a wash bottle containing dry Br2 , followed by a U tube containing P2O5-glass wool. First, the apparatus in purged with pure N2. Then A is cooled with ice water and the N2 -Br2 mixture is introduced. A portion of the Br2 condenses on the Te and reacts quietly with it, while the remainder is retained in the empty U tube D, cooled with an ice-salt mixture. The difference between the weight loss of the Br2 wash bottle and the weight of the condensate in D indicates the amount of bromine remaining in A. When this becomes about twice the amount needed for quantitative conversion to TeBr4, the gas stream is interrupted, stopcock C is closed, and the product slurry is allowed to stand at room temperature for several hours (better overnight) in order to complete the reaction. Then C is reopened and the excess bromine is purged by a stream of N2 while A is simultaneously heated to 50℃. To purify the product, it is sublimed in vacuum. Gas inlet tube a is sealed off at d, the whole apparatus is tilted to a horizontal position, and ground glass joint E is connected to an aspirator through a P2O5 drying tube. During evacuation, A is heated to sublimation temperature (about 350℃) with an electric furnace. Any black condensate which may separate in B at 200℃ is vaporized by heating with a burner. The subsequently deposited yellow to orange-red powder is quite pure TeBr4; if necessary, this can be further purified by an analogous sublimation in high vacuum.

TELLURIUM TETRABROMIDE(10031-27-3)Related Product Information

• Cupric acetate monohydrate
• Nickel chloride
• Sodium bromide
• CESIUM PERCHLORATE
• TELLURIUM HEXAFLUORIDE
• TELLURIUM (IV) IODIDE
• Tellurium tetrachloride
• TELLURIC ACID
• Tellurium dioxide
• POTASSIUM TELLURITE
• Tellurium
• AMMONIUM HEXABROMOTELLURATE(IV) 99.99%
• TELLURIUM DIBROMIDE
• POTASSIUM HEXABROMOTELLURATE(IV)
• TELLURIUM TETRABROMIDE