8128. Reinecke Salt

Nomenclature

CAS number: 13573-16-5
Ammonium (OC-6-11)-diamminetetrakis(thiocyanato-κN)chromate(1-) (1:1); ammonium reineckate; ammonium tetrathiocyanodiammonochromate.
C4H10CrN7S4; mol wt 336.43.
C 14.28%, H 3.00%, Cr 15.46%, N 29.14%, S 38.12%.
NH4[Cr(NH3)2(SCN)4].

Description and references

Exists as monohydrate; made by fusing ammonium thiocyanate with ammonium dichromate. Prepn: Dakin, Org. Synth. coll. vol. II, 555 (1943).

Derivative

Monohydrate.
C4H10CrN7S4.H2O; mol wt 354.44.
C 13.55%, H 3.41%, Cr 14.67%, N 27.66%, S 36.19%, O 4.51%.

Properties

Dark red crystals or red cryst powder. Sparingly sol in cold water; sol in hot water, alcohol. Dec in aq soln with formation of a blue color and free HCN; dec occurs in about 2 weeks at room temp, rapidly above 65°. A similar decompn takes place in boiling alcohol.

Note

The K-salt is also known as Reinecke salt.

Use

Precipitant for primary and secondary amines, proline, hydroxyproline, and certain amino acids; also a reagent for mercury with which it gives a red color or precipitate.