Gold (I) cyanide

Crystal structure
	__ Au + __ C 2+ __ N 3−
Crystal system	hexagonal
Space group	P 6 mm (No. 183)
Lattice parameters	a = 340 pm ; c = 509 pm
General
Surname	Gold (I) cyanide
other names	Gold cyanide
Ratio formula	AuCN
Brief description	dark yellow powder
External identifiers / databases
EC number	208-049-1
ECHA InfoCard	100.007.318
PubChem	68172
Wikidata	Q4505495
properties
Molar mass	222.98 g mol −1
Physical state	firmly
density	7.14 g cm −3 (25 ° C)
solubility	poorly soluble in water
safety instructions
H and P phrases	H: 300-310-330-410
	P: 260-264-273-280-284-301 + 310
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Gold (I) cyanide is an inorganic chemical compound from the group of cyanides .

Extraction and presentation

Gold (I) cyanide can be obtained by reacting potassium dicyanido aurate (I) with hydrochloric acid .

{\ displaystyle \ mathrm {K [Au (CN) _ {2}] + HCl \ longrightarrow AuCN + HCN + KCl}}

It can also be obtained by precipitating a gold (III) chloride solution with potassium cyanide .

properties

Gold (I) -cyanid is a yellow crystalline odorless and tasteless solid. It is stable in air, sparingly soluble in water and dilute acids and soluble in alkali metal cyanide solutions , in potassium hydroxide and aqueous ammonia as well as in sodium thiosulphate and ammonium sulphide solutions. It decomposes on dry heating with a gold deposit. When moist it is unstable in light and turns green in color. The compound has a hexagonal crystal structure (a = 3.40 Å , c = 5.09 Å). There are parallel linear chains of Au- C - N .

Individual evidence

↑ ^a ^b ^c ^d ^e 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. 1018.
↑ ^a ^b ^c ^d ^e data sheet Gold (I) cyanide, 99.9% trace metals basis from Sigma-Aldrich , accessed on April 5, 2013 ( PDF ).
^ Meyers Konversations-Lexikon, 1888: Goldcyanid
^ GH Kelsall: Electrochemistry in mineral and metal processing VI: proceedings of the International Symposium . The Electrochemical Society, 2003, ISBN 1-56677-401-2 , pp. 196 ( limited preview in Google Book search).

[brauer-1] 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. 1018.

[Sigma-2] ↑ ^a ^b ^c ^d ^e data sheet Gold (I) cyanide, 99.9% trace metals basis from Sigma-Aldrich , accessed on April 5, 2013 ( PDF ).

[Meyers-3] Meyers Konversations-Lexikon, 1888: Goldcyanid

[G._H._Kelsall-4] GH Kelsall: Electrochemistry in mineral and metal processing VI: proceedings of the International Symposium . The Electrochemical Society, 2003, ISBN 1-56677-401-2 , pp. 196 ( limited preview in Google Book search).