Ammonium hexachloroiridate

Structural formula
General
Surname	Ammonium hexachloroiridate
other names	Ammonium hexachloroiridate (IV); Iridium (IV) ammonium chloride;
Molecular formula	(NH 4 ) 2 [IrCl 6 ]
Brief description	black-red to black solid
External identifiers / databases
ECHA InfoCard	100.037.264
PubChem	16211476
Wikidata	Q4134945
properties
Molar mass	441.01 g mol −1
Physical state	firmly
density	2.86 g cm −3 (25 ° C)
Melting point	Decomposition from 200 ° C
solubility	slightly soluble in water 10.9 g l −1 (at 25 ° C); 43.8 g l −1 (at 80 ° C);
safety instructions
GHS labeling of hazardous substances Caution
H and P phrases	H: 302-312-332
	P: 280
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Ammonium hexachloroiridate is an inorganic chemical compound from the group of ammonium compounds and hexachloroiridate .

Extraction and presentation

Ammonium hexachloroiridate can be obtained by reacting a solution of disodium hexachloroiridate in aqua regia with ammonium chloride.

{\ displaystyle \ mathrm {Na_ {2} [IrCl_ {6}] + 2 \ NH_ {4} Cl \ longrightarrow (NH_ {4}) _ {2} [IrCl_ {6}] \ downarrow + \ 2 \ NaCl} }

properties

Ammonium hexachloroiridate is in the form of black-red to black octahedra, which are sparingly soluble in water. Above 200 ° C it decomposes into iridium , nitrogen , ammonium chloride and hydrogen chloride . It has a sodium hexachloroplatinate (IV) type crystal structure . It can very easily be converted into ammonium hexachloroiridate (III).

use

Ammonium hexachloroiridate is used as an intermediate in the production of pure iridium from ores containing iridium.

{\ displaystyle {\ ce {(NH4) IrCl6 + 2 H2 -> Ir + 2 NH3 + 6 HCl}}}

Individual evidence

↑ ^a ^b ^c ^d George B. Kauffmann and Larry A. Teter: Ammonium hexachloroiridate (IV) . In: Henry F. Holtzclaw, Jr. (Ed.): Inorganic Syntheses . tape 8 . McGraw-Hill Book Company, Inc., 1966, pp. 223-227 (English).
↑ ^a ^b ^c ^d data sheet Ammonium hexachloroiridate (IV), 99.99% trace metals basis at Sigma-Aldrich , accessed on February 17, 2018 ( PDF ).
↑ ^a ^b ^c ^d 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. 1736.
↑ L: Römpp Lexikon Chemie, 10th edition, 1996-1999 Volume 3: H - L . Georg Thieme Verlag, 2014, ISBN 3-13-200011-6 , p. 2258 ( limited preview in Google Book Search).
^ Josef K. Felixberger: Chemistry for Beginners . Springer-Verlag, 2017, ISBN 978-3-662-52821-1 , pp. 339 ( limited preview in Google Book search).

[IS8-1] George B. Kauffmann and Larry A. Teter: Ammonium hexachloroiridate (IV) . In: Henry F. Holtzclaw, Jr. (Ed.): Inorganic Syntheses . tape 8 . McGraw-Hill Book Company, Inc., 1966, pp. 223-227 (English).

[Sigma-2] ta sheet Ammonium hexachloroiridate (IV), 99.99% trace metals basis at Sigma-Aldrich , accessed on February 17, 2018 ( PDF ).

[brauer-3] 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. 1736.

[L-4] L: Römpp Lexikon Chemie, 10th edition, 1996-1999 Volume 3: H - L . Georg Thieme Verlag, 2014, ISBN 3-13-200011-6 , p. 2258 ( limited preview in Google Book Search).

[Josef_K._Felixberger-5] Josef K. Felixberger: Chemistry for Beginners . Springer-Verlag, 2017, ISBN 978-3-662-52821-1 , pp. 339 ( limited preview in Google Book search).