Reinecke's salt

Reinecke's salt: Reinecke's salt

IUPAC name

Chromate(1-), diaminetetrakis-
(thiocyanato-N)-, ammonium, (OC-6-11)-

Other names

ammonium tetrathiocyanato-
diamminechromate(III),
Reinecke salt,
ammonium reineckate

Identifiers

CAS number 13573-16-5

ChemSpider 21106473^Y

RTECS number na

Jmol-3D images Image 1

SMILES

[NH4+].S=C=N/[Cr-3]([NH3+])([NH3+])(/N=C=S)(/N=C=S)/N=C=S.O

InChI

InChI=1S/4CNS.Cr.3H3N.H2O/c4*2-1-3;;;;;/h;;;;;3*1H3;1H2/q4*-1;+3;;;;/p+1^Y
Key: GXUDINOISGOIAV-UHFFFAOYSA-O^Y
InChI=1/4CNS.Cr.3H3N.H2O/c4*2-1-3;;;;;/h;;;;;3*1H3;1H2/q4*-1;+3;;;;/p+1/rC4H6CrN6S4.H3N.H2O/c6-5(7,8-1-12,9-2-13,10-3-14)11-4-15;;/h6-7H3;1H3;1H2/q-1;;/p+1
Key: GXUDINOISGOIAV-JJHXSEQHAU

Properties

Molecular formula C₄H₁₂N₇OCrS₄

Molar mass 354.42 g/mol

Appearance dark red solid

Density ? g/cm³, ?

Melting point
270 °C

Boiling point
decomposes

Solubility in water soluble in hot water

Structure

Coordination
geometry octahedral

Dipole moment 0 D

Hazards

R-phrases 20/21/22

S-phrases 36

Main hazards toxic

Related compounds

Related compounds [Co(NH₃)₆]Cl₃,
KSCN,
Chromium(III) chloride

Y salt (verify) (what is: Y/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

Infobox 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, acetone, 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]

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.

References

^ Reinecke, A. "Über Rhodanchromammonium-Verbindungen" Annalen der Chemie und Pharmacie, volume 126, pages 113-118 (1863). DOI: 10.1002/jlac.18631260116.

^ Dakin, H. D. (1943). "Reinecke Salt". Organic Syntheses. p. Collected Volume 2, p.555. http://www.orgsyn.org/orgsyn/pdfs/CV2P0555.pdf.

Categories:
Chromium compounds
Coordination compounds
Reagents for organic chemistry

Reinecke's salt

IUPAC name Chromate(1-), diaminetetrakis- (thiocyanato-N)-, ammonium, (OC-6-11)-
Other names ammonium tetrathiocyanato- diamminechromate(III), Reinecke salt, ammonium reineckate
Identifiers
CAS number	13573-16-5
ChemSpider	21106473^Y
RTECS number	na
Jmol-3D images	Image 1
SMILES [NH4+].S=C=N/[Cr-3]([NH3+])([NH3+])(/N=C=S)(/N=C=S)/N=C=S.O
InChI InChI=1S/4CNS.Cr.3H3N.H2O/c42-1-3;;;;;/h;;;;;31H3;1H2/q4-1;+3;;;;/p+1^Y Key: GXUDINOISGOIAV-UHFFFAOYSA-O^Y InChI=1/4CNS.Cr.3H3N.H2O/c42-1-3;;;;;/h;;;;;31H3;1H2/q4-1;+3;;;;/p+1/rC4H6CrN6S4.H3N.H2O/c6-5(7,8-1-12,9-2-13,10-3-14)11-4-15;;/h6-7H3;1H3;1H2/q-1;;/p+1 Key: GXUDINOISGOIAV-JJHXSEQHAU
Properties
Molecular formula	C₄H₁₂N₇OCrS₄
Molar mass	354.42 g/mol
Appearance	dark red solid
Density	? g/cm³, ?
Melting point	270 °C
Boiling point	decomposes
Solubility in water	soluble in hot water
Structure
Coordination geometry	octahedral
Dipole moment	0 D
Hazards
R-phrases	20/21/22
S-phrases	36
Main hazards	toxic
Related compounds
Related compounds	[Co(NH₃)₆]Cl₃, KSCN, Chromium(III) chloride
Y salt (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

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Look at other dictionaries:

Reinecke salt — n a red crystalline powder NH4[Cr(NH3)2(SCN)4]·H2O that is used as a reagent and a precipitant (as for primary and secondary amines) … Medical dictionary
reinecke acid — ˈrīnə̇kə , kē noun Usage: usually capitalized R Etymology: after A. Reinecke, 19th century German chemist : the monobasic acid HCr(NH3)2(SCN)4 of which Reinecke salt is the ammonium salt … Useful english dictionary
Salt — In medicine, salt usually refers to sodium chloride, table salt, used for seasoning food, for the preservation of meat, etc. Salt is found in the earth and in sea water and is isolated by evaporation and crystallization from sea water and other… … Medical dictionary
Reinecke acid — Rei·nec·ke acid rī nə kē n the monobasic acid HCr(NH3)2(SCN)4 of which Reinecke salt is the ammonium salt … Medical dictionary
Reinecke salt — Reinekės druska statusas T sritis chemija formulė NH₄[Cr(NH₃)₂(SCN)₄]·H₂O atitikmenys: angl. ammonium reineckate; Reinecke salt rus. рейнекат аммония; соль Рейнеке ryšiai: sinonimas – amonio reinekatas … Chemijos terminų aiškinamasis žodynas
reinecke salt — noun Usage: usually capitalized R Etymology: after A. Reinecke, 19th century German chemist : a red crystalline coordination complex NH4[Cr(NH3)2(SCN)4].H2O that is formed by adding ammonium dichromate to hot ammonium thiocyanate and that with… … Useful english dictionary
List of named inorganic compounds — Well known inorganic and organometallic compounds and reagents that are named after individuals include Adams catalyst (proposed to be PtOx) Adamsite (NH(C6H4)2AsCl) Adkins catalyst (Cu2Cr2O5) Attenburrow s Oxide (MnO2) Arduengo carbene (class of … Wikipedia
Metal ammine complex — Ball and stick model of the tetraamminediaquacopper(II) cation, [Cu(NH3)4(H2O)2]2+ In coordination chemistry, metal ammine complexes are metal complexes containing at least one ammonia (NH3) ligand. Ammine is spelled this way due to historical… … Wikipedia
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Reinecke's salt

Structure

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References

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Reinecke's salt

Structure

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