Silver thiocyanate

Silver thiocyanate is the silver salt of thiocyanic acid with the formula AgSCN.

Silver thiocyanate
Names
IUPAC name
Silver(I) thiocyanate, Silver thiocyanate
Other names
Thiocyanic acid, silver (1+) thiocyanate; Silver isothiocyanate; Silver sulphocyanide[1]
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.015.395
EC Number
  • 216-934-9
UNII
UN number 3077
Properties
AgSCN
Appearance Colorless crystals
Odor Odorless
Melting point 170 °C (338 °F; 443 K)
decomposes[2]
0.14 mg/L (19.96 °C)
0.25 mg/L (21 °C)
6.68 mg/L (100 °C)[1]
1.03·10−12[3]
Solubility Insoluble in acids (reacts)[4] except when concentrated, acetates, aq. nitrates[1]
Solubility in silver nitrate 43.2 mg/L (25.2 °C, 3 nAgNO3/H2O)[1]
Solubility in sulfur dioxide 14 mg/kg (0 °C)[2]
Solubility in methanol 0.0022 mg/kg[2]
−6.18·10−5 cm3/mol[3]
Structure
Monoclinic, mS32 (293 K)[5]
C2/c, No. 15 (293 K)[5]
2/m (293 K)[5]
a = 8.792(5) Å, b = 7.998(5) Å, c = 8.207(5) Å (293 K)[5]
α = 90°, β = 93.75(1)°, γ = 90°
8
Thermochemistry
63 J/mol·K[2]
131 J/mol·K[2]
88 kJ/mol[2]
Hazards
GHS pictograms [4]
GHS Signal word Warning
H302, H312, H332, H410[4]
P273, P280, P501[4]
NFPA 704 (fire diamond)
Flammability code 0: Will not burn. E.g. waterHealth code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
0
2
0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Structure

AgSCN is monoclinic with 8 molecules per unit cell. Each SCN− group has an almost linear molecular geometry, with bond angle 179.6(5)°. Weak Ag—Ag interactions of length 0.3249(2) nm to 0.3338(2) nm are present in the structure.[5]

Production

Silver thiocyanate is produced by the reaction between silver nitrate and potassium thiocyanate.

References
  1. Comey, Arthur Messinger; Hahn, Dorothy A. (February 1921). A Dictionary of Chemical Solubilities: Inorganic (2nd ed.). New York: The MacMillan Company. p. 884.
  2. Anatolievich, Kiper Ruslan. "silver thiocyanate". http://chemister.ru. Retrieved 2014-07-19. External link in |website= (help)
  3. Lide, David R., ed. (2009). CRC Handbook of Chemistry and Physics (90th ed.). Boca Raton, Florida: CRC Press. ISBN 978-1-4200-9084-0.
  4. Sigma-Aldrich Co., Silver thiocyanate. Retrieved on 2014-07-19.
  5. Zhu, H.-L.; Liu, G.-F.; Meng, F.-J. (2003). "Refinement of the crystal structure of silver(I) thiocyanate, AgSCN". Zeitschrift für Kristallographie – New Crystal Structures. München: Oldenbourg Wissenschaftsverlag GmbH. 218 (JG): 263–264. doi:10.1524/ncrs.2003.218.jg.285. ISSN 2197-4578.


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