Ammonium permanganate

Ammonium permanganate

Names
IUPAC name Ammonium manganate(VII)
Other names Ammonium permanganate
Identifiers
CAS Number	13446-10-1 N
3D model (Jmol)	Interactive image Interactive image
ChemSpider	55512 Y
InChI InChI=1S/Mn.H3N.4O/h;1H3;;;;/q;;;;;-1/p+1 Y Key: PASCZIGWJWZUOV-UHFFFAOYSA-O Y InChI=1/Mn.H3N.4O/h;1H3;;;;/q;;;;;-1/p+1/rMnO4.H3N/c2-1(3,4)5;/h;1H3/q-1;/p+1 Key: PASCZIGWJWZUOV-AGRLYYGXAH
SMILES [O-][Mn](=O)(=O)=O.[N+] [O-][Mn](=O)(=O)=O.[NH4+]
Properties
Chemical formula	NH4MnO4
Molar mass	136.974 g/mol
Appearance	rhombic needle crystals or powder with rich violet-brown or dark purple metallic sheen, become steel-gray in storage; magenta–rose in solution
Density	g/cm3, solid
Melting point	decomposes
Solubility in water	8.0 g/100 ml at 15 °C
Structure
Crystal structure	Orthorhombic
Thermochemistry
Std molar entropy (So298)	J.K−1.mol−1
Std enthalpy of formation (ΔfHo298)	kJ.mol−1
Hazards
Main hazards	Oxidant (O), Harmful (Xn), Dangerous for the environment (N)
Safety data sheet	[ External MSDS]
NFPA 704	0 0 3 OX
Related compounds
Other anions	Ammonium perrhenate
Other cations	Sodium permanganate; Potassium permanganate
Related compounds	Potassium manganate (K2MnO4); Manganese heptoxide; Sodium permanganate; Potassium permanganate
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

Ammonium permanganate is the chemical compound NH₄MnO₄, or NH₃·HMnO₄. It is soluble in water. It is a strong oxidizer, owing to its permanganate anion, and it is a moderately strong explosive, owing to the combination of oxidizer permanganate anion and reducing ammonium cation. Dry ammonium permanganate can detonate by heat, shock, or friction, and it may explode at temperatures above 140 °F (60 °C).^[1]

Ammonium permanganate decomposes explosively to manganese dioxide, nitrogen, and water:^[2]

2 NH₄MnO₄ → 2 MnO₂ + N₂ + 4 H₂O

Ammonium permanganate was first prepared by Eilhard Mitscherlich in 1824 by reaction of silver permanganate with equal molar amount of ammonium chloride, filtering the silver chloride and evaporating the water. It can be also prepared in a similar way from barium permanganate and ammonium sulfate.

Ammonium permanganate decomposes slowly in storage even at normal temperatures. A sample stored for 3 months was only 96% pure, after 6 months it assumed color of iodine and had strong smell of nitrogen oxides. It emits toxic fumes when decomposed by heat.^[3]

Quaternary ammonium permanganate compounds can be prepared, such as tetrabutylammonium permanganate.^[4]

References