Ezüst-tiocianát

ezüst-tiocianát

Az ezüst-tiocianát szerkezeti képlete

Az ezüst-tiocianát pálcikamodellje
IUPAC-név ezüst(I)-tiocianát, ezüst-tiocianát
Más nevek ezüst-szulfocianid[1]
Kémiai azonosítók
CAS-szám 1701-93-5
PubChem 74345
ChemSpider 66941
EINECS-szám 216-934-9
SMILES
C(#N)[S-].[Ag+]
InChIKey RHUVFRWZKMEWNS-UHFFFAOYSA-M
UNII S44O8TME5U
Kémiai és fizikai tulajdonságok
Kémiai képlet AgSCN
Megjelenés színtelen kristályok
Szag szagtalan
Olvadáspont 170 °C (bomlik[3])
Oldhatóság (vízben) 0,14 mg/L (19,96 °C)
0,25 mg/L (21 °C)
6,68 mg/L (100 °C)[1]
Oldhatóság nem oldódik savakban (reagál),[4] kivéve töményen, acetátokban, vizes nitrátokban[1]
Oldhatóság (ezüst-nitrát) 43,2 mg/L (25,2 °C, 3 nAgNO3/H2O)[1]
Oldhatóság (kén-dioxid) 14 mg/kg (0 °C)[3]
Oldhatóság (metanol) 0,0022 mg/kg[3]
Mágneses szuszceptibilitás −6,18·10−5 cm³/mol[2]
Kristályszerkezet
Kristályszerkezet monoklin, mS32 (293 K)[5]
Tércsoport C2/c, No. 15 (293 K)[5]
Rácsállandó a = 8,792(5) Å Å, b = 7,998(5) Å Å, c = 8,207(5) Å (293 K)[5] Å
Rácsállandó-szög α = 90°, β = 93,75(1)°, γ = 90°
Termokémia
Std. képződési
entalpia ΔfHo298		 88 kJ/mol[3]
Standard moláris
entrópia So298		 131 J/mol·K[3]
Hőkapacitás, C 63 J/mol·K[3]
Veszélyek
NFPA 704
0
2
0
 
Ha másként nem jelöljük, az adatok az anyag standardállapotára (100 kPa) és 25 °C-os hőmérsékletre vonatkoznak.

Az ezüst-tiocianát a tiociánsav ezüst sója, képlete AgSCN.

Szerkezete

Az AgSCN monoklin, elemi celláját 8 molekula alkotja. Az SCN− ion szerkezete szinte teljesen lineáris, a kötésszög 179,6(5)°. A gyenge Ag···Ag kölcsönhatás távolsága 324,9(2) pm és 333,8(2) pm közötti.[5]

Előállítása

Ezüst-nitrát és kálium-tiocianát reakciójával állítják elő.

Jegyzetek

  1. ↑ a b c d Comey, Arthur Messinger. A Dictionary of Chemical Solubilities: Inorganic, 2nd, The MacMillan Company, 884. o. (1921. február 1.) 
  2. ↑ a b CRC Handbook of Chemistry and Physics, 90th, CRC Press (2009). ISBN 978-1-4200-9084-0 
  3. ↑ a b c d e f Anatolievich, Kiper Ruslan: silver thiocyanate. http://chemister.ru . (Hozzáférés: 2014. július 19.)
  4. ↑ a b c d Sigma-Aldrich Co., Silver thiocyanate
  5. ↑ a b c d e (2003) „Refinement of the crystal structure of silver(I) thiocyanate, AgSCN”. Zeitschrift für Kristallographie - New Crystal Structures 218 (JG), 263–264. o, Kiadó: Oldenbourg Wissenschaftsverlag GmbH. DOI:10.1524/ncrs.2003.218.jg.285. ISSN 2197-4578. 

Fordítás

  • Ez a szócikk részben vagy egészben a Silver thiocyanate című angol Wikipédia-szócikk ezen változatának fordításán alapul. Az eredeti cikk szerkesztőit annak laptörténete sorolja fel. Ez a jelzés csupán a megfogalmazás eredetét és a szerzői jogokat jelzi, nem szolgál a cikkben szereplő információk forrásmegjelöléseként.

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