英文互译镜像站

Silver thiocyanate

Last updated
Silver thiocyanate
Skeletal formula of silver thiocyanate AgSCN-skel.svg
Skeletal formula of silver thiocyanate
Ball-and-stick model of silver thiocyanate AgSCN-bas.png
Ball-and-stick model of 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 OOjs UI icon edit-ltr-progressive.svg
EC Number
  • 216-934-9
PubChem CID
UNII
UN number 3077
  • InChI=1S/CHNS.Ag/c2-1-3;/h3H;/q;+1/p-1 Yes check.svgY[ inchi ]
    Key: RHUVFRWZKMEWNS-UHFFFAOYSA-M Yes check.svgY[ inchi ]
  • C(#N)[S-].[Ag+]
Properties
AgSCN
Molar mass 165.95 g/mol
AppearanceColorless 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]
Std molar
entropy (S⦵298)
131 J/mol·K [2]
88 kJ/mol [2]
Hazards
GHS labelling:
GHS-pictogram-exclam.svg GHS-pictogram-pollu.svg [4]
Warning
H302, H312, H332, H410 [4]
P273, P280, P501 [4]
NFPA 704 (fire diamond)
NFPA 704.svgHealth 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
2
0
0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Silver thiocyanate is the silver salt of thiocyanic acid with the formula AgSCN. Silver thiocyanate appears as a white crystalline powder. It is very commonly used in the synthesis of silver nanoparticles. Additionally, studies have found silver nanoparticles to be present in saliva present during the entire digestive process of silver nitrate. Silver thiocyanate is slightly soluble in water, with a solubility of 1.68 × 10−4 g/L. [6] It is insoluble in ethanol, acetone, and acid. [7]

Contents

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

Solution reaction

Silver thiocyanate has been commonly produced by the reaction between silver nitrate and potassium thiocyanate.[ citation needed ]

AgNO3 + KSCN → KNO3 + AgSCN

Ion-exchange route

Silver thiocyanate may be formed via an ion exchange reaction. In this double displacement reaction, silver nitrate and ammonium thiocyanate are dissolved in distilled water to produce silver thiocyanate and ammonium nitrate. [8]

AgNO3 + NH4SCN → NH4NO3 + AgSCN

Additionally, silver thiocyanate can be formed through the double displacement reaction between ammonium thiocyanate and silver chloride to form a precipitate of silver thiocyanate.

AgCl + NH4SCN → NH4Cl + AgSCN

Uses

The most common use of silver thiocyanate is as a silver nanoparticle. Silver thiocyanate nanoparticles have been found in saliva throughout the entire artificial digestion of silver nitrate. [9] The nanoparticles can also be used as good ion conductors. [10]

Silver thiocyanate has also been used to absorb uv-visible light at values less than 500 nm. At longer wavelengths, silver thiocyanate has been found to have good photocatalytic properties. [8]

Characterization

Upon production, silver thiocyanate can be characterized through a wide range of techniques: x-ray powder diffraction (XRD), x-ray photoelectron spectroscopy (XPS), Raman Spectroscopy, ultraviolet photoelectron spectroscopy (UPS), and thermogravimetric analysis (TGA).[ citation needed ]

References

  1. 1 2 3 4 Comey, Arthur Messinger; Hahn, Dorothy A. (February 1921). A Dictionary of Chemical Solubilities: Inorganic (2nd ed.). New York: The MacMillan Company. p. 884.
  2. 1 2 3 4 5 6 Anatolievich, Kiper Ruslan. "silver thiocyanate". chemister.ru. Retrieved 2014-07-19.
  3. 1 2 Haynes, William M., ed. (2014). CRC Handbook of Chemistry and Physics. doi:10.1201/b17118. ISBN   978-0-429-17019-5.[ page needed ]
  4. 1 2 3 4 Sigma-Aldrich Co., Silver thiocyanate. Retrieved on 2014-07-19.
  5. 1 2 3 4 5 Zhu, H.-L.; Liu, G.-F.; Meng, F.-J. (December 2003). "Refinement of the crystal structure of silver (I) thiocyanate, AgSCN". Zeitschrift für Kristallographie - New Crystal Structures. 218 (JG): 285–286. doi: 10.1524/ncrs.2003.218.jg.285 .
  6. ↑ Kästner, Claudia; Lampen, Alfonso; Thünemann, Andreas F. (2018). "What happens to the silver ions? – Silver thiocyanate nanoparticle formation in an artificial digestion". Nanoscale. 10 (8): 3650–3653. doi: 10.1039/C7NR08851E . PMID   29431819.
  7. ↑ "SILVER THIOCYANATE | 1701-93-5". ChemicalBook. Retrieved 2023-11-20.
  8. 1 2 Zhang, Shuna; Zhang, Shujuan; Song, Limin; Wu, Xiaoqing; Fang, Sheng (May 2014). "Synthesis and photocatalytic property of a new silver thiocyanate semiconductor". Chemical Engineering Journal. 243: 24–30. Bibcode:2014ChEnJ.243...24Z. doi:10.1016/j.cej.2014.01.015.
  9. ↑ Kästner, Claudia; Lampen, Alfonso; Thünemann, Andreas F. (2018). "What happens to the silver ions? – Silver thiocyanate nanoparticle formation in an artificial digestion". Nanoscale. 10 (8): 3650–3653. doi: 10.1039/c7nr08851e . PMID   29431819.
  10. ↑ Yang, Ming; Ma, Jing (September 2009). "Synthesis and characterizations of AgSCN nanospheres using AgCl as the precursor". Applied Surface Science. 255 (23): 9323–9326. Bibcode:2009ApSS..255.9323Y. doi:10.1016/j.apsusc.2009.07.028.
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.
主动推送镜像站群 MirrorElf 泛域名镜像 YES镜站站群引擎 蜘蛛池+镜像