Basic information
- CAS
1317-34-6- Standard SMILES
[O]=[Mn][O][Mn]=[O]- InChIKey
GEYXPJBPASPPLI-UHFFFAOYSA-N- Molecular formula
- Mn2O3
- Average molar mass
- 157.874 g/mol
- Monoisotopic mass
- 157.86083
Overview
Manganese(III) oxide is an oxide of manganese. Manganese is a naturally occurring metal with the symbol Mn and the atomic number 25. It does not occur naturally in its pure form, but is found in many types of rocks in combination with other substances such as oxygen, sulfur, or chlorine. Manganese occurs naturally in most foods and small amounts are needed to stay healthy, as manganese ions act as cofactors for a number of enzymes. (L228, L229)
Names & identifiers
- Preferred name
- manganese(III) oxide
- IUPAC
- oxo(oxomanganiooxy)manganese
- English name
- Manganese (III) oxide
- Molecular formula
- Mn2O3
- Molecular weight
- 157.87
Names & synonyms
Manganese(III) oxideManganese oxide (Mn2O3)Manganese sesquioxideManganic oxideDimanganese trioxideManganese trioxideManganese manganateManganese sisquioxideManganese(3+) oxideEINECS 215-264-4oxo[(oxomanganio)oxy]manganeseMANGANESE SESQUIOXIDE, Mn2O3
Show more names
manganicoxidemanganesetrioxidemanganese(3+)oxidemanganesemanganatedimanganesetrioxidemanganesesisquioxidemanganeseoxide(mn2o3)Manganese (III) oxideManganese(III)oxide,99%
XQ8YIG4A7Coxo((oxomanganio)oxy)manganeseRefChem:809905bis(manganesoylol) manganeseDTXCID201323887215-264-4DTXSID90893847MANGANESE SESQUIOXIDE [MI]
Database identifiers
- CAS
1317-34-6- PubChem CID
- 14824
- EC Number
- 215-264-4
Properties
Computed structural properties
- Topological polar surface area
- 43.4 Ų
- Hydrogen bond donors
- 0
- Hydrogen bond acceptors
- 3
- Rotatable bonds
- 0
- Heavy atoms
- 5
- Formal charge
- 0
- Complexity
- 34.2
Experimental & physicochemical properties
Chemical ClassesMetals -> Manganese Compounds, Inorganic
SpringerMaterials Propertiesdielectric constant
Density5 @25 °C
Physical Description
Liquid; Other Solid
Black solid, insoluble in water; [Merck Index]
Physicochemical properties
- Melting point
- 1080 °C · 1080°C (dec.)
- Density
- 4.5 g/mL · 4.5 g/mL at 25 °C(lit.)
- bulk density
- 0.35 g/cm3 · 0.35g/cm3
- storage temp.
- Store at room temperature, keep dry and cool
- solubility
- 2 O · insoluble in H2O
- form
- Powder
- color
- Black
- Specific Gravity
- 4.5 · 4.5
- Water Solubility
- Soluble in acid and ammonium chloride. Insoluble in water, alcohol and acetone.
Safety & regulation
Safety information is for reference only and does not replace the supplier’s Safety Data Sheet (SDS), applicable regulations, or professional assessment.
GHS classification
GHS Classification
This chemical does not meet GHS hazard criteria for 7.9% (38 of 484) of reports.
Warning
H302 (58.7%): Harmful if swallowed [Warning Acute toxicity, oral]
P261, P264, P264+P265, P270, P271, P280, P301+P317, P302+P352, P304+P340, P305+P351+P338, P317, P319, P321, P330, P332+P317, P337+P317, P362+P364, P403+P233, P405, and P501 (click each P-code to see the statement)
Aggregated GHS information provided per 484 reports by companies from 20 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.
Danger
Hazard information
Regulatory Information
Chemical: Manganese oxide (Mn2O3)
Manganese oxide (Mn2O3) is listed on the EPA's Chemical Data Reporting (CDR) system. Manufacturers and importers of Manganese oxide (Mn2O3) are required to report information about their production and use of this chemical to the EPA under the Toxic Substances Control Act (TSCA). (40 eCFR Part 711)
REACH registered substance: Dimanganese trioxide (EC: 215-264-4)
Manganese oxide (Mn2O3): Does not have an individual approval but may be used as a component in a product covered by a group standard. It is not approved for use as a chemical in its own right.
Other Safety InformationIMAP assessments - Manganese oxides: Human health tier II assessment
Hazards SummaryFine dust is flammable; Toxic by inhalation; [Hawley] See Manganese and linked occupational diseases.
Hazard Classes and Categories
Acute Tox. 4 (58.7%)
Specific target organ toxicity (repeated exposure) - category 1
Reproductive toxicity - Category 1B
Chemistry & industry
Pharmacology
Metabolism/Metabolites
Manganese is absorbed mainly via ingestion, but can also be inhaled. It binds to alpha-2-macroglobulin, albumin, or transferrin in the plasma and is distributed to the brain and all other mammalian tissues, though it tends to accumulate more in the liver, pancreas, and kidney. Manganese is capable of existing in a number of oxidation states and is believed to undergo changes in oxidation state within the body. Manganese oxidation state can influence tissue toxicokinetic behavior, and possibly toxicity. Manganese is excreted primarily in the faeces. (L228)
Uses & manufacturing
Uses
Found in the mineral hausmannite; [Merck Index] Used to produce ceramic magnets and semiconductors; [Ullmann]
Semiconductor Manufacturing [Category: Industry]
U.S. Production2023: <50,000 lb
Household ProductsInformation on 1 consumer products that contain Manganese sesquioxide in the following categories is provided:
General Manufacturing InformationManganese oxide (Mn2O3): ACTIVE
Applications
UsesManganese(III) oxide is used to produce ceramic magnets and semiconductors. Further, it serves as a precursor to lithium manganese oxide. In addition to this, it acts as a useful battery cathode.
Preparation methods
PreparationAnhydrous manganese(III) oxide is found as the mineral braunite, Mn2O3, while a hydrated form, Mn2O3.H2O, which is chemically more reactive, occurs as manganite. Manganese forms both anions and cations in oxidation state +3. Simple salts of tervalent manganese are not stable. However, complexes are more stable, the hexacyanomanganates(III) being an example: K3Mn(CN)6 is a red crystalline solid, isomorphous with potassium hexacyanoferrate(III) and slowly hydrolysed. Manganese(III) oxide is formed as a grey solid by heating manganese(IV) oxide to 700°C for several hours: 4MnO2 ---> 2Mn203 + O2 It is converted into trimanganese tetroxide when heated above 940°C in air or reduced by hydrogen above 230°C. Hot concentrated hydrochloric acid is oxidized to chlorine by manganese(III) oxide: Mn203 (s) + 6H + + 2e- ==2Mn2+ + 3H2O Mn203 (s) + 6H + + 2Cl- ---> 2Mn2+ + 3H2O + Cl2
Related reactions
0 records
No reaction records under the current filter.
Compound notes
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