Hafnium (IV) bromide

Crystal structure
__ Hf 4+      __ Br -
General
Surname	Hafnium (IV) bromide
other names	Hafnium tetrabromide
Ratio formula	HfBr 4
Brief description	white solid
External identifiers / databases
CAS number 13777-22-5 EC number 237-416-9 ECHA InfoCard 100.034.001 PubChem 83725 Wikidata Q4096870
properties
Molar mass	498.11 g mol −1
Physical state	firmly
density	4.9 g cm −3  (25 ° C)
Melting point	424 ° C (under pressure)
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 314 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 .

Hafnium (IV) bromide is an inorganic chemical compound of hafnium from the group of bromides .

Extraction and presentation

Hafnium (IV) bromide can be obtained by bromination of hafnium with bromine at 320-350 ° C.

${\displaystyle \mathrm {Hf+2\ Br_{2}\longrightarrow HfBr_{4}} }$

It is also possible to produce it by reacting hafnium (IV) oxide with carbon and bromine.

${\displaystyle \mathrm {HfO_{2}+2\ C+2\ Br_{2}\longrightarrow HfBr_{4}+2\ CO} }$

properties

Hafnium (IV) bromide is a white solid. When exposed to water, it hydrolyzes completely. Its crystal structure corresponds to that of tin (IV) iodide with the space group Pa 3 (space group no. 205) . It sublimes at 317 ° C.

Individual evidence

1. ↑ ^{a b} Roger Blachnik (Ed.): Pocket book for chemists and physicists . Volume III: Elements, Inorganic Compounds and Materials, Minerals . founded by Jean d'Ans, Ellen Lax. 4th, revised and revised edition. Springer, Berlin 1998, ISBN 3-540-60035-3 , pp. 478 f . ( limited preview in Google Book search).
2. ↑ ^{a b c d e} data sheet hafnium (IV) bromide, anhydrous, powder, 99.99% (purity excludes ~ 0.2% zirconium.) At Sigma-Aldrich , retrieved on May 4, 2013 ( PDF ).
3. ↑ ^{a b} Georg Brauer (Ed.), With the collaboration of Marianne Baudler u a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume II, Ferdinand Enke, Stuttgart 1978, ISBN 3-432-87813-3 , p. 1358.
4. ↑ Georg Brauer (Ed.), With the collaboration of Marianne Baudler a. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume II, Ferdinand Enke, Stuttgart 1978, ISBN 3-432-87813-3 , p. 1359.