Manganese dioxide

IUPAC Name: Dioxomanganese 
Empirical Formula: MnO₂
Molecular Weight: 86.9368
Canonical SMILES: O=[Mn]=O
InChI: InChI=1S/Mn.2O
InChIKey: NUJOXMJBOLGQSY-UHFFFAOYSA-N
EINECS: 215-202-6
Product Categories: Inorganics 
Water Solubility: insoluble 
Stability: Stable. Incompatible with strong acids, strong reducing agents, organic materials. 
Density: 5.026 g/cm³
Flash point: 535 °C 
Appearance: black powder
Melting Point: 535 °C (dec.)(lit.)
Classification Code of Manganese dioxide (CAS NO.1313-13-9): Reproductive Effect

The chemical properties of Manganese dioxide have been well examined since relatively pure materials have long been readily found or prepared. The manganese dioxide was subsequently recovered by the Weldon process.In molten KOH in the presence of oxygen, MnO₂ reacts to give the manganate anion, as discussed below under Applications.

One of Manganese dioxide (CAS NO.1313-13-9) first uses was in glass making. In modern times, the predominant application of Manganese dioxide is as a component of dry cell batteries. A specialized use of manganese dioxide is as an oxidant in organic synthesis. The principal use for MnO₂ is for dry-cell batteries, such as the alkaline battery and the zinc-carbon battery. MnO₂ is also used for production of MnO₄^–. It is used extensively as an oxidizing agent in organic synthesis, for example, for the oxidation of allylic alcohols.

The natural occuring Manganese dioxide contains impurities and a considerable amount of manganese(III) ions. The production of synthetic manganese dioxide is important. Two groups of methods are used, yielding chemical manganese dioxide (CMD) and electrolytical manganese dioxide (EMD). The CMD is mostly used for the production of ferrites, while the EMD is used for the production of batteries.

 Manganese dioxide and its compounds are on the Community Right-To-Know List. Reported in EPA TSCA Inventory.

Poison by intravenous and intratracheal routes. Moderately toxic by subcutaneous route. Experimental reproductive effects. A powerful oxidizer. Flammable by chemical reaction. It must not be heated or rubbed in contact with easily oxidizable matter. Violent thermite reaction when heated with aluminum. Potentially explosive reaction with hydrogen peroxide, peroxomonosulfuric acid, chlorates + heat, anilinium perchlorate. Ignition on contact with hydrogen sulfide. Violent reaction with oxidizers, potassium azide (when warmed), diboron tetrafluoride, Incandescent reaction with calcium hydride, chlorine trifluoride, rubidium acetylide (at 350°C). Vigorous reaction with hydroxylaminium chloride. Incompatible with H₂O₂, H₂SO₅, Na₂O₂. Keep away from heat and flammable materials.
Hazard Codes: Xn
Risk Statements: 20/22 
R20/22:Harmful by inhalation and if swallowed.
Safety Statements: 25 
S25:Avoid contact with eyes.
RIDADR: 3137
WGK Germany: 1
RTECS: OP0350000
PackingGroup: III

OSHA PEL: CL 5 mg(Mn)/m³
ACGIH TLV: TWA 0.03 mg(Mn)/m³

 Manganese dioxide (CAS NO.1313-13-9), its Synonyms are Manganese peroxide ; Manganese superoxide ; Manganese(IV) oxide ; Manganese dioxide, ore of Chapter 26 ; Manganese oxide (MnO2) ; BOG manganese ; Black manganese oxide ; Braunstein ; Manganese (diossido di) ; Manganese (dioxyde de) .