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silver cyanide : ウィキペディア英語版
silver cyanide

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Silver cyanide is the chemical compound with the formula AgCN. This white solid forms upon treatment of solutions containing Ag+ with cyanide. This precipitation step is used in some schemes to recover silver from solution. Silver cyanide is used in silver-plating.
==Structure==
Its structure consist of -()- chains in which the linear two-coordinate Ag+ ions, typical of silver(I) and other d10 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(I) cyanide. The silver to carbon and silver to nitrogen bond lengths in AgCN are both ~2.09 Å〔Hibble, S. J.; Cheyne, S. M.; Hannon, A. C.; Eversfield, S. G.“Beyond Bragg scattering: the structure of AgCN determined from total neutron diffraction” Inorganic Chemistry 2002, volume 41, pages 1042.〕 and the cyanide groups show head-to-tail disorder.〔Bryce, D. L.; Wasylishen, R.E.“Insight into the Structure of Silver Cyanide from 13C and 15N Solid-State NMR Spectroscopy” Inorganic Chemistry 2002, volume 41, pages 4131.〕

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