Gold (I) cyanide
Crystal structure | ||||||||||||||||
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__ Au + __ C 2+ __ N 3− | ||||||||||||||||
Crystal system | ||||||||||||||||
Space group |
P 6 mm (No. 183) |
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Lattice parameters |
a = 340 pm |
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General | ||||||||||||||||
Surname | Gold (I) cyanide | |||||||||||||||
other names |
Gold cyanide |
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Ratio formula | AuCN | |||||||||||||||
Brief description |
dark yellow powder |
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External identifiers / databases | ||||||||||||||||
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properties | ||||||||||||||||
Molar mass | 222.98 g mol −1 | |||||||||||||||
Physical state |
firmly |
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density |
7.14 g cm −3 (25 ° C) |
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solubility |
poorly soluble in water |
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safety instructions | ||||||||||||||||
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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 .
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).