Manganese trioxide fluoride

Manganese trioxide fluoride

Names
Other names Permanganyl fluoride
Identifiers
CAS Number	15586-97-7
3D model (JSmol)	Interactive image
ChemSpider	57450402
InChI InChI=1S/FH.Mn.3O/h1H;;;;/q;+1;;;/p-1 Key: JWSFKFAINKAKTR-UHFFFAOYSA-M
SMILES O=[Mn](F)(=O)=O
Properties
Chemical formula	FMnO3
Molar mass	121.933 g·mol^−1
Appearance	green liquid
Density	6.042 g/cm^3
Melting point	−45 °C (−49 °F; 228 K)
Boiling point	decomposition above its melting point
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Manganese trioxide fluoride is an inorganic compound with the formula MnO₃F. A green diamagnetic liquid, the compound has no applications, but it is of some academic interest as a rare example of a metal trioxide fluoride.

The compound was detected in the 1880s but was only purified and crystallized much more recently.^[1] It can be prepared by fluorosulfuric acid and potassium permanganate:

KMnO₄ + 2HF → MnO₃F + KF + H₂O

MnO₃F crystallizes as a monomer, as confirmed by X-ray crystallography. The molecules are tetrahedral with Mn-O and Mn-F distances of 1.59 and 1.72 Å, respectively.

In contrast with MnO₃F, TcO₃F and ReO₃F have more complex structures as solids. The Re compound crystallizes as chains or rings consisting of fluoride-bridge octahedra. TcO₃F crystallizes as dimers with fluoride bridges.^[2] The rhenium compound also forms stable adducts with Lewis bases,^[3] whereas the MnO₃F is unstable in the presence of Lewis bases.

References

1. Schmidbaur, Hubert; Schwarz, W. H. Eugen (2021). "Permanganyl Fluoride: A Brief History of the Molecule MnO₃F and of Those Who Cared for It". Chemistry – A European Journal. 27 (23): 6848–6859. doi:10.1002/chem.202004759. PMC 8247864. PMID 33219726.
2. Supeł, Joanna; Abram, Ulrich; Hagenbach, Adelheid; Seppelt, Konrad (2007). "Technetium Fluoride Trioxide, TcO₃F, Preparation and Properties". Inorganic Chemistry. 46 (14): 5591–5595. doi:10.1021/ic070333y. PMID 17547395.
3. Supeł, Joanna; Marx, Rupert; Seppelt, Konrad (2005). "Preparation and Structure of Rhenium Fluoride Trioxide ReO₃F, and the Polymorphism of Rhenium Trifluoride Dioxide, ReO₂F₃". Zeitschrift für anorganische und allgemeine Chemie. 631 (15): 2979–2986. doi:10.1002/zaac.200500239.