NIOBIUM BROMIDE Property

Melting point:

150°C

Boiling point:

361,6°C

Density 

4.360

solubility 

soluble in H2O, ethanol

form 

Powder

color 

reddish-brown

Water Solubility 

soluble H2O, alcohol, ethyl bromide [KIR81]

Sensitive 

moisture sensitive

EPA Substance Registry System

Niobium bromide (NbBr5) (13478-45-0)

Safety

Hazard Codes 

C

Risk Statements 

20/21/22-34

Safety Statements 

26-27-28-36/37/39-45

RIDADR 

UN 3260 8/PG 2

WGK Germany 

3

HazardClass 

8

PackingGroup 

III

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H302Harmful if swallowed

H312Harmful in contact with skin

H314Causes severe skin burns and eye damage

H332Harmful if inhaled

Precautionary statements

P260Do not breathe dust/fume/gas/mist/vapours/spray.

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

P270Do not eat, drink or smoke when using this product.

P271Use only outdoors or in a well-ventilated area.

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

P301+P312IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell.

P301+P330+P331IF SWALLOWED: Rinse mouth. Do NOT induce vomiting.

P302+P352IF ON SKIN: wash with plenty of soap and water.

P303+P361+P353IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.

P304+P340IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing.

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.

P312Call a POISON CENTER or doctor/physician if you feel unwell.

P321Specific treatment (see … on this label).

P322Specific measures (see …on this label).

P330Rinse mouth.

P363Wash contaminated clothing before reuse.

P405Store locked up.

P501Dispose of contents/container to..…

NIOBIUM BROMIDE Chemical Properties,Usage,Production

Chemical Properties

yellow powder(s) or red crystals; ortho-rhomb, a=0.6127nm, b=1.2198 nm, c=1.855 nm; m.p. 265.2°C, b.p. 361.6°C; sensitive to moisture; can be formed by reacting Br2 and niobium at ~500°C [STR93] [KIR81]

Synthesis

(1) First, the air is completely removed from the reactor. Then, the section of the tube containing the metal is heated by a coil wound directly on the reactor, or by a tubular electric furnace o. If Nb powder is used, then bromide formation begins at 90°C; with solid Nb, it starts at 195°C . The nascent bromide sublimes onto cold finger /. When larger quantities are desired, large-diameter receiver a is attachedtotheendof the reactor. The extremely hygroscopic bromide should be removed from the apparatus while the latter is in a dry box.
Nb + 5/2Br2 = NbBr5.
(2) In the method of Chaigneau, the mixture of pentoxide and AlBr3, in proportions indicated by the above equation, is sealed under vacuum into a Pyrex glass tube (before use, the AlBr3 is purified by vacuum sublimation). The tube is heated for 24 hours at 200°C, and allowed to cool; the small amounts of Br 3 formed in the process and residual AlBr3 are vacuum-sublimed at 140°C. The pure pentahalide is then separated from the Al 3O3 by vacuum sublimation at 240°C, yielding large crystals.
3 Nb2O5 + 10AlBr3 = 6 NbBr5 + 5A12O
(3) Nb2O5 + 3 C + 6 Br2 = 2 NbBr5 + COBr2 + 2 CO2