| Silver acetylide | |
|---|---|
 |
|
| IUPAC name |
Disilver acetylide
|
| Identifiers | |
| CAS number | 7659-31-6 |
| SMILES |
[C-]#[C-].[Ag+].[Ag+]
|
| Properties | |
| Molecular formula | C2Ag2 |
| Molar mass | 239.76 g mol−1 |
| Appearance | white solid |
| Melting point |
120 °C |
| Solubility in water | soluble |
| Hazards | |
| Flash point | flammable |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
| Infobox references | |
Silver acetylide is an inorganic chemical compound with the formula Ag2C2, a metal acetylide. The name is derived from the way it is synthesized, and emphasizes that the compound can be regarded as a salt of the weak acid acetylene . Since acetylene is called "ethyne" in the modern IUPAC nomenclature, the name "silver ethynide" would be more appropriate. In either case, the name makes it clear that the anion consists of two carbon atoms linked by a triple bond. The less specific alternative "silver carbide" is not used, although the analogous calcium compound CaC2 is called calcium carbide . Silver acetylide is a heat and shock sensitive high explosive with the unusual property that on ignition it does not evolve any gas:
- Ag2C2(s) → 2 Ag(s) + 2 C(s)
The detonation velocity of Silver acetylide is 4000 m/s.
Synthesis
Silver acetylide can be produced by passing acetylene gas through a solution of silver nitrate.[1]
The equation is as follows:
- 2 AgNO3(aq) + C2H2(g) → Ag2C2(s) + 2 HNO3(aq)
The reaction product is a greyish to white precipitate. This is the same synthesis from Berthelot in which he first found silver acetylide in 1866.[2]
Silver acetylide can be formed on the surface of silver or high-silver alloys, eg. in pipes used for transport of acetylene, if silver brazing was used in their joints.
Toxicity
As with all silver salts, silver acetylide is toxic. Ingesting as little as 2 grams can be fatal.[citation needed]
References
- ^ G.-C. Guo, Q.-G. Wang, G.-D. Zhou, T. C. W. Mak (1998). "Synthesis and characterization of Ag2C2·2AgClO4·2H2O: a novel layer-type structure with the acetylide dianion functioning in a 6-η1,η1:η2,η2:η2,η2 bonding mode inside an octahedral silver cage". Chem. Commun.: 339–340. doi:.
- ^ M. P. Berthelot (1866). "Ueber eine neue Klasse zusammengesetzter metallhaltiger Radicale (A new class of combined metallic radicals)". Annalen der Chemie 138 (2): 245–253. doi:.
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