Manganese heptoxide

Manganese(VII) oxide

Names
IUPAC name Manganese(VII) oxide
Other names Manganic oxide dimanganese heptoxide Permanganic anhydride Permanganic oxide
Identifiers
CAS Number	12057-92-0 Y
3D model (JSmol)	Interactive image
ChemSpider	9944714
ECHA InfoCard	100.031.829
EC Number	235-025-8
PubChem CID	13879826
CompTox Dashboard (EPA)	DTXSID10894891
InChI InChI=1S/2Mn.7O/q;;7*-2 Key: ZEFXULJEOUCCOQ-UHFFFAOYSA-N
SMILES O=[Mn](=O)(=O)O[Mn](=O)(=O)=O
Properties
Chemical formula	Mn2O7
Molar mass	221.87 g/mol
Appearance	dark red oil (room temp.), green if in contact with sulfuric acid
Density	2.79 g/cm3
Melting point	5.9 °C (42.6 °F; 279.0 K)
Boiling point	explodes on heating
Solubility in water	decomposes to permanganic acid, HMnO4
Structure
Crystal structure	monoclinic
Coordination geometry	bitetrahedral
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	explosive, strong oxidizer, very corrosive
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H201, H271, H314, H330
Precautionary statements	P260, P284, P283, P221
NFPA 704 (fire diamond)	4 4 4 OX
Related compounds
Related compounds	Re2O7 KMnO4 Tc2O7 Cl2O7
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

Manganese(VII) oxide (manganese heptoxide) is an inorganic compound with the formula Mn₂O₇. Manganese heptoxide is a volatile liquid with an oily consistency. It is a highly reactive and powerful oxidizer that reacts explosively with nearly any organic compound. It was first described in 1860.^[1] It is the acid anhydride of permanganic acid.