Niobium (V) bromide

Structural formula
General
Surname	Niobium (V) bromide
other names	Niobium pentabromide
Molecular formula	NbBr 5
Brief description	black solid
External identifiers / databases
CAS number 13478-45-0 EC number 236-778-5 ECHA InfoCard 100.033.420 PubChem 83517 Wikidata Q2311164
properties
Molar mass	412.5 g mol −1
Physical state	firmly
density	4.36 g cm −3
Melting point	265 ° C
boiling point	361 ° C
solubility	soluble in alcohol
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 302-312-314-332 P: 280-305 + 351 + 338-310
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Niobium (V) bromide is an inorganic chemical compound of niobium from the group of bromides .

Extraction and presentation

Niobium (V) bromide can be obtained by reacting niobium with bromine .

${\displaystyle \mathrm {2\ Nb+5\ Br_{2}\longrightarrow 2\ NbBr_{5}} }$

properties

Niobium (V) bromide is an extremely moisture-sensitive red solid that is readily soluble in ethanol . Three modifications are known. The α- and β-forms have orthorhombic crystal structures with the space groups Pbma (No. 57, position 5) and Ccmm (No. 63, position 2) . The third form has a triclinic crystal structure with the space group P 1 (No. 2) . This is isotype with the triclinic form of niobium (V) iodide .

Individual evidence

1. ↑ ^{a b c d e f g} Georg Brauer (Ed.) U. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume III, Ferdinand Enke, Stuttgart 1981, ISBN 3-432-87823-0 , p. 1444.
2. ↑ ^{a b} Datasheet Niobium (V) bromide, 98% from Sigma-Aldrich , accessed on November 5, 2019 ( PDF ).
3. ↑ S. Tragl and H.-J. Meyer: Crystal structure of niobium pentabromide, NbBr ₅ , a triclinic phase. In: Zeitschrift für Kristallographie - New Crystal Structures , 222, 2007, pp. 161–162, doi : 10.1524 / ncrs.2007.0066