Silver cyanide

Silver cyanide

Chembox new
Name = Silver cyanide
ImageFile = Silver cyanide.jpg
ImageName = Silver cyanide
IUPACName = Silver cyanide
OtherNames = Argentous cyanide
Section1 = Chembox Identifiers
CASNo = 506-64-9
RTECS = VW3850000
Section2 = Chembox Properties
Formula = CNAg
MolarMass = 133.89 g/mol
Appearance = colorless, gray (impure)
Density = 3.95 g/cm³, solid
Solubility = insoluble
Solvent = other solvents
SolubleOther = insol.
MeltingPt = 320 °C
pKsp = 15.92
Section3 = Chembox Structure
Coordination = linear
CrystalStruct =
Section7 = Chembox Hazards
ExternalMSDS =
MainHazards = toxic
RPhrases = 25-32-33-41-50/53
SPhrases = 7-26-45-60-61
Section8 = Chembox Related
OtherCpds = AgCl
NaCN
Copper(I) cyanide

Silver cyanide is the chemical compound with the formula AgCN. This colorless solid forms upon treatment of solutions containing Ag+ with cyanide. This precipitation step is used in some schemes to recover silver from solution. Its structure consist of chains with the connectivity Ag-C≡N-Ag-C≡N-, etc. Two-coordination is typical of silver, and cyanide is well known to bridge transition metals, as illustrated by the more famous case of Prussian Blue.

AgCN precipitates upon the addition of sodium cyanide to a solution containing Ag+. The precipitate dissolves upon the addition of further amounts of cyanide or other ligands such as tertiary phosphines.

Silver cyanides form structural complex materials upon reaction with other anions. [Urban, V.; Pretsch, T.; Hartl, H. “From AgCN Chains to a Fivefold Helix and a Fishnet-Shaped Framework Structure” Angewandte Chemie International Edition 2005, volume 44, pages 2794 – 2797.] Some silver cyanides are luminescent. [Omary, M. A.; Webb, T.R.; Assefa, Z.; Shankle, G. E.; Patterson, H. H. “Crystal Structure, Electronic Structure, and Temperature-Dependent Raman Spectra of Tl [Ag(CN)2] : Evidence for Ligand-Unsupported Argentophilic Interactions” Inorganic Chemistry 1998, volume 37, pages 1380-1386.]

References


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