| Identification | Back Directory | [Name]
NIOBIUM BROMIDE | [CAS]
13478-45-0 | [Synonyms]
NbBr5
99.9%Nb
NIOBIUM BROMIDE
Einecs 236-778-5
NIOBIUM (V) BROMIDE
NIOBIUM PENTABROMIDE
niobiumbromide(nbbr5)
Niobium(V)pentabromide
NIOBIUM(V) BROMIDE 98%
Niobium bromide (NbBr5)
NIOBIUM(V) BROMIDE: 99.9%
Niobium(V)bromide(99.9%-Nb)
Niobium Pentabromide 99.9%
NIOBIUM (V) BROMIDE, 99.999%
NIOBIUM(V) BROMIDE: 99.9% (METALS BASIS)
Niobiumbromidemetalsbasismeshbrownredpowder | [EINECS(EC#)]
236-778-5 | [Molecular Formula]
Br5Nb | [MDL Number]
MFCD00016227 | [MOL File]
13478-45-0.mol | [Molecular Weight]
492.43 |
| Hazard Information | Back Directory | [Chemical Properties]
yellow powder(s); ortho-rhomb, a=0.6127nm, b=1.2198 nm, c=1.855 nm; 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 |
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