|Jmol-3D images||Image 1|
|Molar mass||354.42 g/mol|
|Appearance||dark red solid|
|Density||? g/cm3, ?|
|Solubility in water||soluble in hot water|
|Dipole moment||0 D|
| (what is: / ?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
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. According to Organic Syntheses, NH4[Cr(NCS)4(NH3)2] is prepared by treatment of molten NH4SCN (ca. 145–150 °C) with (NH4)2Cr2O7.
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.
- T. Peppel, C. Schmidt and M. Köckerling, "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 2011, 637, 1314–1321. doi: 10.1002/zaac.201100091
- Reinecke, A. "Über Rhodanchromammonium-Verbindungen" Annalen der Chemie und Pharmacie, volume 126, pp. 113–118 (1863). doi:10.1002/jlac.18631260116.
- Dakin, H. D. (1943). "Reinecke Salt". Organic Syntheses 2,. p. 555.