Silver thiocyanate
Appearance
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Names | |
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IUPAC name
Silver(I) thiocyanate, Silver thiocyanate
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Other names
Thiocyanic acid, silver (1+) thiocyanate; Silver isothiocyanate; Silver sulphocyanide[1]
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Identifiers | |
3D model (JSmol)
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ChemSpider | |
ECHA InfoCard | 100.015.395 |
EC Number |
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PubChem CID
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UNII | |
UN number | 3077 |
CompTox Dashboard (EPA)
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Properties | |
AgSCN | |
Appearance | Colorless crystals |
Odor | Odorless |
Melting point | 170 °C (338 °F; 443 K) decomposes[4] |
0.14 mg/L (19.96 °C) 0.25 mg/L (21 °C) 6.68 mg/L (100 °C)[1] | |
Solubility product (Ksp)
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1.03·10−12[2] |
Solubility | Insoluble in acids (reacts)[3] 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)[4] |
Solubility in methanol | 0.0022 mg/kg[4] |
−6.18·10−5 cm3/mol[2] | |
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°
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Formula units (Z)
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8 |
Thermochemistry | |
Heat capacity (C)
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63 J/mol·K[4] |
Std molar
entropy (S⦵298) |
131 J/mol·K[4] |
Std enthalpy of
formation (ΔfH⦵298) |
88 kJ/mol[4] |
Hazards | |
GHS labelling: | |
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Warning | |
H302, H312, H332, H410[3] | |
P273, P280, P501[3] | |
NFPA 704 (fire diamond) | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Silver thiocyanate is the silver salt of thiocyanic acid with the formula AgSCN.
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
- ^ a b c d Comey, Arthur Messinger; Hahn, Dorothy A. (February 1921). A Dictionary of Chemical Solubilities: Inorganic (2nd ed.). New York: The MacMillan Company. p. 884.
- ^ a b Lide, David R., ed. (2009). CRC Handbook of Chemistry and Physics (90th ed.). Boca Raton, Florida: CRC Press. ISBN 978-1-4200-9084-0.
- ^ a b c d Sigma-Aldrich Co., Silver thiocyanate. Retrieved on 2014-07-19.
- ^ a b c d e f Anatolievich, Kiper Ruslan. "silver thiocyanate". chemister.ru. Retrieved 2014-07-19.
- ^ a b c d e 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. 218 (JG). München: Oldenbourg Wissenschaftsverlag GmbH: 263–264. doi:10.1524/ncrs.2003.218.jg.285. ISSN 2197-4578.