Silver cyanide is the chemical compound with the formula AgCN. This white solid forms upon treatment of solutions containing Ag<sup>+</sup> with cyanide. This precipitation step is used in some schemes to recover silver from solution. Silver cyanide is used in silver-plating.
Its structure consist of -- chains in which the linear two-coordinate Ag<sup>+</sup> ions, typical of silver(I) and other d<sup>10</sup> ions are bridge by the cyanide ions. (This is the same binding mode as seen in the more famous case of Prussian blue.) These chains then pack hexagonally with adjacent chains ofset by +/- 1/3 of the "c" lattice parameter. This is the same as the structure adopted by the high temperature polymorph of copper cyanide. The silver to carbon and silver to nitrogen bond lengths in AgCN are both ~2.09 Å
AgCN precipitates upon the addition of sodium cyanide to a solution containing Ag<sup>+</sup>. The precipitate dissolves... Read More