Ammonium hexafluorochromate
{{Chembox
| Name = Ammonium hexafluorochromate
| ImageFile =
| ImageSize =
| ImageAlt =
| IUPACName =
| OtherNames = Ammonium hexafluorochromate(III)
| Section1 = {{Chembox Identifiers
| CASNo =
| ChemSpiderID =
| UNII =
| DTXSID =
| EINECS =
| PubChem =
| StdInChI =
| StdInChIKey =
| SMILES = [NH4+].[NH4+].[NH4+].F[Cr-3](F)(F)(F)(F)F
}}
| Section2 = {{Chembox Properties
| N=3|H=12|Cr=1|F=6
| MolarMass =
| Appearance = green crystals
| Density = g/cm3
| MeltingPt =
| BoilingPt =
| Solubility =
}}
| Section3 = {{Chembox Hazards
| GHSPictograms =
| GHSSignalWord =
| GHS_ref =
| HPhrases =
| MainHazards =
| FlashPt =
| AutoignitionPt =
}}
}}
Ammonium hexafluorochromate is an inorganic chemical compound with the chemical formula {{chem2|(NH4)3CrF6}}.{{cite web |title=Ammonium hexafluorochromate(iii) |url=https://webbook.nist.gov/cgi/formula?ID=B8001322 |publisher=NIST |access-date=23 August 2024}}
Physical properties
Ammonium hexafluorochromate forms crystals of cubic system, space group F43m.{{cite book |last1=Donnay |first1=Joseph Désiré Hubert |title=Crystal Data; Determinative Tables |date=1963 |publisher=American Crystallographic Association |page=948 |url=https://books.google.com/books?id=x5ghAQAAMAAJ&dq=ammonium+hexafluorochromate&pg=PA1155 |access-date=23 August 2024 |language=en}}{{cite book |last1=Donnay |first1=Joseph Désiré Hubert |title=Crystal Data: Inorganic compounds |date=1973 |publisher=National Bureau of Standards |page=239 |url=https://books.google.com/books?id=5lVCBwmZsLYC&dq=ammonium+hexafluorochromate&pg=RA6-PA239 |access-date=23 August 2024 |language=en}}
Chemical properties
When heated, ammonium hexafluorochromate decomposed directly to the pure chromium(III) fluoride.{{cite journal |last1=Bukovec |first1=P. |last2=Šiftar |first2=J. |title=Zur Kenntnis der thermischen Zersetzung von Ammoniumhexafluoroscandat,-titanat,-vanadat und-chromat |journal=Monatshefte für Chemie / Chemical Monthly |date=1 May 1974 |volume=105 |issue=3 |pages=510–516 |doi=10.1007/BF00912602 |url=https://link.springer.com/article/10.1007/BF00912602 |access-date=23 August 2024 |language=de |issn=1434-4475}}{{cite journal |last1=Menz |first1=D. -H. |last2=Bentrup |first2=U. |title=Thermal decomposition of ammonium fluorochromates |journal=Journal of Fluorine Chemistry |date=1 September 1991 |volume=54 |issue=1 |pages=174 |doi=10.1016/S0022-1139(00)83684-2 |url=https://www.sciencedirect.com/science/article/abs/pii/S0022113900836842 |access-date=23 August 2024 |issn=0022-1139}}
:{{chem2|[NH4]3[CrF6] → CrF3 + 3 NH3 + 3 HF}}
References
{{fluorine compounds}}
{{ammonium salts}}