Reinecke's salt

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, acetone, and ethanol.[2] The chromium atom is surrounded by six nitrogen atoms in an octahedral geometry. The NH3 ligands are mutually trans and the Cr–NCS groups are linear. The salt crystallizes with one molecule of water.[1]

Reinecke's salt
Names
IUPAC name
ammonium (OC-6-11)-diamminetetrakis(thiocyanato-N)chromate(1−)
Other names
ammonium tetrathiocyanato-
diamminechromate(III),

Reinecke salt,

ammonium reineckate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.625
RTECS number
  • na
UNII
Properties
C4H12N7OCrS4
Molar mass 354.42 g/mol
Appearance dark red solid
Density 1.49 g/cm3[1]
Melting point 270 °C (518 °F; 543 K)
Boiling point decomposes
soluble in hot water
Structure
octahedral
0 D
Hazards
Main hazards toxic
R-phrases (outdated) 20/21/22
S-phrases (outdated) 36
Related compounds
Related compounds
 [Co(NH3)6]Cl3,
KSCN,
Chromium(III) chloride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

Structure

It was first reported in 1863.[3] NH4[Cr(NCS)4(NH3)2] is prepared by treatment of molten NH4SCN (melting point around 145–150 °C) with (NH4)2Cr2O7.[4]

Use

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.

gollark: Consider: interstate travel by road is quite slow, thus making the US significantly more divided. Airports are faster, but also more expensive and not good for bulk goods, plus security queues make things slower.
gollark: Small brain: interstate highway system.Large brain: airports everywhere or something.Large glowy brain or something: interstate high-speed maglev railway.Galaxy brain: interstate suborbital rocket system.Transcendent universe brain: interstate passenger railgun.
gollark: I'd hope shadowy conspiracies would be better.
gollark: They're just evil government #124901724, governments do not appear to be very good at long term planning in general.
gollark: At least if there was some evil conspiracy running everything they might have a *strategy* and *long-term planning*.

References
  1. Saito, Y.; Takeuchi, Y.; Pepinsky, R. (1955). "The Crystal Structure of Ammonium Reineckate". Zeitschrift für Kristallographie, Kristallgeometrie, Kristallphysik, Kristallchemie. 106 (1–6): 476–477. doi:10.1524/zkri.1954.106.16.476.
  2. Peppel, T.; Schmidt, C.; Köckerling, M. (2011). "Synthesis, Properties, and Structures of Salts with the Reineckate Anion, [CrIII(NCS)4(NH3)2]−, and Large Organic Cations". Zeitschrift für Anorganische und Allgemeine Chemie. 637: 1314–1321. doi:10.1002/zaac.201100091.
  3. Reinecke, A. (1863). "Über Rhodanchromammonium-Verbindungen" (PDF). Annalen der Chemie und Pharmacie. 126: 113–118. doi:10.1002/jlac.18631260116.
  4. Dakin, H. D. (1943). "Reinecke Salt". Organic Syntheses. 2: 555.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.