Zinc bromide

Molecular Structure:

Molecular Formula: Br₂Zn
Molecular Weight: 225.217
IUPAC Name: Dibromozinc
Synonyms of Zinc bromide (CAS NO.7699-45-8): EINECS 231-718-4 ; HSDB 1047 ; UNII-OO7ZBU9703 ; Zinc dibromide ; Zinc bromide (ZnBr2)
CAS NO: 7699-45-8
Classification Code: Mutation data
Melting point: 394 °C
SMILES: Br[Zn]Br 
InChI: InChI=1/2BrH.Zn/h2*1H;/q;;+2/p-2 
InChIKey: VNDYJBBGRKZCSX-NUQVWONBAG
Std. InChI: InChI=1S/2BrH.Zn/h2*1H;/q;;+2/p-2 
Std. InChIKey: VNDYJBBGRKZCSX-UHFFFAOYSA-L

 Zinc bromide (CAS NO.7699-45-8) is used as a transparent shield against radiation. Two glass panes filled with a strong aqueous solution of zinc bromide has a very high density, which can then be used as a window on a hot cell. This type of window has the advantage over lead glass in that it will not darken as a result of exposure to radiation. The advantage of an aqueous salt solution is that any radiation damage will be last less than a millisecond, so the shield will undergo self-repair. 

 ZnBr₂ can be prepared by reacting (double displacement) barium bromide and zinc sulfate to produce the insoluble barium sulfate along with zinc bromide or the reaction of HBr and zinc metal:
BaBr₂ + ZnSO₄ → BaSO₄ + ZnBr₂
Zn + HBr → ZnBr₂ + H₂   

RTECS : ZH1150000

Hazard Codes of Zinc bromide (CAS NO.7699-45-8): C,N
Risk Statements: 34-50/53 
R34:Causes burns. 
R50/53:Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment.
Safety Statements: 26-36/37/39-45-60-61-29 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36/37/39: Wear suitable protective clothing, gloves and eye/face protection. 
S45: In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 
S60: This material and its container must be disposed of as hazardous waste. 
S61: Avoid release to the environment. Refer to special instructions / safety data sheets. 
S29: Do not empty into drains.
RIDADR: UN 3260 8/PG 3
WGK Germany: 3
RTECS: ZH1150000
F: 3-21
HazardClass: 8
PackingGroup: II