Hafnium (IV) iodide

Crystal structure
__ Hf 4+      __ I -
General
Surname	Hafnium (IV) iodide
other names	Hafnium tetraiodide
Ratio formula	HfI 4
Brief description	yellow-orange solid
External identifiers / databases
CAS number 13777-23-6 EC number 621-502-1 ECHA InfoCard 100.150.349 PubChem 83726 Wikidata Q4202648
properties
Molar mass	686.11 g mol −1
Physical state	firmly
density	5.6 g cm −3  (25 ° C)
Melting point	455 ° C (under pressure)
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 360 P: 201-308 + 313
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Hafnium (IV) iodide is an inorganic chemical compound of hafnium from the group of iodides .

Extraction and presentation

Hafnium (IV) iodide can be produced by reacting hafnium with iodine

${\displaystyle \mathrm {Hf+2\ I_{2}\longrightarrow HfI_{4}} }$

or obtained by reacting hafnium (IV) chloride with aluminum iodide.

${\displaystyle \mathrm {3\ HfCl_{4}+4\ AlI_{3}\longrightarrow 3\ HfI_{4}+4\ AlCl_{3}} }$

properties

Hafnium (IV) iodide is a yellow-orange solid that hydrolyzes in water to form hafnium oxide iodide and has a crystal structure of the tin (IV) iodide type with the space group Pa 3 (space group no. 205) . It sublimes at 393 ° C.

use

Hafnium (IV) iodide is used to make pure hafnium. In 1925 the first sample of pure hafnium was obtained by pyrolysis of hafnium (IV) iodide.

Individual evidence

1. ↑ ^{a b c d e} Georg Brauer (Hrsg.): Handbook of Preparative Inorganic Chemistry . 3., reworked. Edition. tape II . Enke, Stuttgart 1978, ISBN 3-432-87813-3 , p. 1360 .
2. ↑ ^{a b c d} Data sheet Hafnium (IV) iodide, anhydrous, 99% from Sigma-Aldrich , accessed on May 4, 2013 ( PDF ).
3. ^ Alan George Sharpe: Inorganic chemistry. [Main volume] Pearson Education, 2005, ISBN 978-0-13-039913-7 , pp. 652 ( limited preview in Google Book search).
4. ↑ Roger Blachnik (Ed.): Paperback 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 ( limited preview in Google Book search).
5. ^ Dale L. Perry: Handbook of Inorganic Compounds, Second Edition . Taylor & Francis US, 2011, ISBN 1-4398-1462-7 , pp. 194 ( limited preview in Google Book search).
6. ^ Mark T. Swihart, Mark Donald Allendorf, M. Meyyappan: Fundamental Gas-Phase and Surface Chemistry of Vapor-Phase Deposition II and ... The Electrochemical Society, 2001, ISBN 978-1-56677-319-5 , pp. 153 ( limited preview in Google Book search).
7. ↑ Z. Guide to the Elements: Nature's Building Blocks: An A . Oxford University Press, 2001, ISBN 0-19-850341-5 , pp. 173 ( limited preview in Google Book search).