Niobium (IV) bromide

General
Surname	Niobium (IV) bromide
other names	Niobium tetrabromide
Molecular formula	NbBr 4
Brief description	black solid
External identifiers / databases
CAS number 13842-75-6 Wikidata Q15632856
properties
Molar mass	412.5 g mol −1
Physical state	firmly
density	4.72 g cm −3
Sublimation point	300 ° C (sublimation)
solubility	reacts with water
safety instructions
GHS hazard labeling no classification available
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

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

Extraction and presentation

Niobium (IV) bromide can be obtained by reacting niobium with bromine , whereby niobium (V) bromide is also formed.

${\displaystyle \mathrm {Nb+2\ Br_{2}\longrightarrow NbBr_{4}} }$

properties

Niobium (IV) bromide is a very moisture-sensitive diamagnetic solid that is in the form of black needles with a steel sheen. It is soluble in dilute hydrobromic acid, and the solution looks ink blue. Its crystal structure is orthorhombic with the space group Amam (space group no. 63, position 4) , a = 717.9  pm , b = 1222 pm, c = 1285 pm.

Individual evidence

1. ↑ ^{a b c d e} 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} W. M. Haynes (Ed.): CRC handbook of chemistry and physics. A ready-reference book of chemical and physical data . founded by David R. Lide. 93rd edition. CRC Press, Boca Raton 2012, ISBN 978-1-4398-8049-4 , pp. 4–78 (English, limited preview in Google Book Search).
3. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.