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Reinecke's salt



Reinecke's salt
General
Systematic name Chromate(1-), diaminetetrakis-
(thiocyanato-N)-, ammonium, (OC-6-11)-
Other names ammonium tetrathiocyanato-
diamminechromate(III),

Reinecke salt,
ammonium reineckate

Molecular formula C4H12N7OCrS2
Molar mass 354.42 g/mol
Appearance dark red solid
CAS number [13573-16-5]
Properties
Density and phase  ? g/cm3, ?
Solubility in water soluble in hot water
Solubility in other solvents soluble in ethanol
Melting point 270 °C
Boiling point decomposes
Acidity (pKa)  ?
Structure
Coordination
geometry 		octahedral
Crystal structure  ?
Dipole moment 0 D
Hazards
MSDS External MSDS
Main hazards toxic
NFPA 704
R/S statement R: 20/21/22
S: 36
RTECS number na
Supplementary data page
Thermodynamic
data 		Phase behaviour
Solid
Spectral data UV, IR, NMR, MS
Related compounds
Related compounds [Co(NH3)6]Cl3,
KSCN,
Chromium(III) chloride
Except where noted otherwise, data are given for
materials in their standard state (at 25°C, 100 kPa)
Infobox disclaimer and references

Reinecke's salt is a chemical compound with the formula NH4[Cr(NCS)4(NH3)2].H2O. The dark-red crystalline compound is soluble in boiling water and ethanol.

Structure

The chromium atom is surrounded by six nitrogen atoms in an octahedral geometry; the NH3 ligands are mutually trans. The salt crystallizes with one molecule of water. It was first reported in 1863.[1]

According to Organic Syntheses, NH4[Cr(NCS)4(NH3)2] is prepared by treatment of molten NH4SCN (ca. 145–150 °C) with (NH4)2Cr2O7.[2]

This salt was once widely used to precipitate primary and secondary amines as their ammonium salts. Included in the amines that effectively form crystalline precipitates are those derived from the amino acids, including proline and hydroxyproline. It also reacts with Hg2+ compounds, giving a red color or a red precipitate.

References

  1. ^ Reinecke, A. "Über Rhodanchromammonium-Verbindungen" Annalen der Chemie und Pharmacie, volume 126, pages 113-118 (1863). DOI: 10.1002/jlac.18631260116.
  2. ^ Dakin, H. D. "Reinecke Salt" Organic Syntheses, Collected Volume 2, p.555 (1943). http://www.orgsyn.org/orgsyn/pdfs/CV2P0555.pdf
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Reinecke's_salt". A list of authors is available in Wikipedia.
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