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IRON (II) OXIDE structure
IRON (II) OXIDE structure


Iupac Name:oxoiron
CAS No.: 1345-25-1
Molecular Weight:71.844
Modify Date.: 2022-11-02 12:51
Introduction: In manufacture of green, heat-absorbing glass; in steel manufacture; in enamels; as catalyst. View more+
1. Names and Identifiers
1.1 Name
1.2 Synonyms

CI 77489 EINECS 215-721-8 FERROUS OXIDE Iron monooxide Iron monoxide Iron, oxo- ironmonooxide[qr] ironmonoxide[qr] ironoxide(feo) ironoxide[feo][qr] MFCD00016095 Natural wuestite naturalwuestite[qr] Oxoiron

1.3 CAS No.
1.4 CID
1.6 Molecular Formula
FeO (isomer)
1.7 Inchi
1.8 InChkey
1.9 Canonical Smiles
1.10 Isomers Smiles
2. Properties
2.1 Density
5.7?g/mL?at 25?°C(lit.)
2.1 Melting point
2.1 Precise Quality
2.1 PSA
2.1 logP
2.1 Appearance
2.2 Storage
Air Sensitive. Ambient temperatures.
2.3 Color/Form
Black cubic crystals
2.4 Water Solubility
Practically insol in water and alkalies; readily sol in acids
Insoluble in alcohol
2.5 Spectral Properties
2.6 Stability
Stable. Incompatible with strong oxidizing agents. Highly flammable.
3. Use and Manufacturing
3.1 Usage
In manufacture of green, heat-absorbing glass; in steel manufacture; in enamels; as catalyst.
4. Safety and Handling
4.1 Hazard Codes
4.1 Risk Statements
4.1 Safety Statements
4.1 Other Preventative Measures
SRP: The scientific literature for the use of contact lenses in industry is conflicting. The benefit or detrimental effects of wearing contact lenses depend not only upon the substance, but also on factors including the form of the substance, characteristics and duration of the exposure, the uses of other eye protection equipment, and the hygiene of the lenses. However, there may be individual substances whose irritating or corrosive properties are such that the wearing of contact lenses would be harmful to the eye. In those specific cases, contact lenses should not be worn. In any event, the usual eye protection equipment should be worn even when contact lenses are in place.
All ... /iron/ preparations should be kept in child-proof bottles. /Iron preparations/
4.2 Cleanup Methods
Sweep spilled substance into covered containers; if appropriate, moisten first to prevent dusting. Wash away remainder with plenty of water.
4.3 DisposalMethods
SRP: The most favorable course of action is to use an alternative chemical product with less inherent propensity for occupational exposure or environmental contamination. Recycle any unused portion of the material for its approved use or return it to the manufacturer or supplier. Ultimate disposal of the chemical must consider: the material's impact on air quality; potential migration in soil or water; effects on animal, aquatic, and plant life; and conformance with environmental and public health regulations.
UN 3178 4.1/PG 2
4.4 Fire Fighting Procedures
In case of fire in the surroundings: all extinguishing agents allowed.
4.5 FirePotential
Ferrous oxide is spontaneously flammable in air.
The oxide (prepared at 300 deg C) burns in air above 200 deg C, while the finely divided oxide prepared by reduction may be pyrophoric at ambient temperature. That prepared by thermal decomposition under vacuum of iron(II)oxalate is also pyrophoric.
4.6 WGK Germany
4.6 Protective Equipment and Clothing
If inhaled, iron is a local irritant to the lung and gastrointestinal tract. /Iron compounds/
4.7 Reactivities and Incompatibilities
Fluorine does not act in the cold on ferrous oxide, but with gentle heat a reaction sets in with incandescence.
When ferrous oxide, prepared at 300 deg C, is heated in sulfur dioxide, the mass becomes incandescent.
Easily oxidized by air. It is a strong base and readily absorbed /carbon dioxide/.
The oxide incandesces when heated in sulfur dioxide.
Ignites when heated in air above 200 deg C
Hazardous reaction with nitric acid (powdered oxide); hydrogen peroxide; sulfur dioxide and heat.
When pyrophoric iron oxide is gently warmed with nitric acid, the oxide becomes incandescent.
4.8 Report

Related compounds: Iron(III) oxide, Iron(II,III) oxide

4.9 Skin, Eye, and Respiratory Irritations
If inhaled, iron is a local irritant to the lung and gastrointestinal tract. /Iron compounds/
4.10 Safety

Ignites when heated in air above 200°C. The powdered oxide may be pyrophoric. Incandescent or hazardous reaction with nitric acid (with powdered oxide), hydrogen peroxide, sulfur dioxide + heat. See also IRON and IRON COMPOUNDS.
Safety Information of?Iron(II) oxide (CAS NO.1345-25-1):
Hazard Codes: FFlammable
Risk Statements: 11???
R11:Highly flammable.
Safety Statements: 16-33-7/9?
S16:Keep away from sources of ignition.?
S33:Take precautionary measures against static discharges.?
S7:Keep container tightly closed.?
S9:Keep container in a well-ventilated place.
RIDADR: UN 3178 4.1/PG 2

4.11 Sensitive
Air Sensitive
4.12 Specification

?Iron(II) oxide , its CAS NO. is 1345-25-1, the synonyms are Iron monooxide ; Natural wuestite ; Iron(II) oxide .


2.Hazard identification

2.1 Classification of the substance or mixture

Not classified.

2.2 GHS label elements, including precautionary statements

Pictogram(s) No symbol.
Signal word

No signal word.

Hazard statement(s)


Precautionary statement(s)








2.3 Other hazards which do not result in classification


8. Other Information
8.0 Description
When iron is heated in a low partial pressure of oxygen above 575°C, FeO is formed. However, this is only stable at high temperatures and decomposes into iron and Fe304 when it is cooled slowly. To obtain crystalline FeO the high temperature product must be quenched rapidly to stop this disproportionation.
8.1 Chemical Properties
Crystalline FeO (wustite) melts at 1368°C with a heat of fusion ΔH= 7·5 kcal mole-1. It has a heat of formation of - 63·7 kcal mole-1 at 25° and a density of 5·7. Below 198°K (the Néel temperature) FeO is antiferromagnetic. It crystallizes with the rock salt structure having four Fe2+ and four02- ions per unit cell.
8.2 Physical properties
Black cubic crystal; density 5.7g/cm3; melts at 1,377°C; insoluble in water and alkalies; dissolves in acids.
8.3 Occurrence
Iron(II) oxide occurs in the mineral, wustite. It is used in the manufacture of heat-absorbing green glasses. It also is used in ceramic mixtures and enamels; and as a catalyst.
8.4 Preparation
Iron(II) oxide may be prepared by thermal decomposition of iron(II) oxalate:
FeC2O4 → FeO + CO + CO2
The product obtained above is impure, that may contain small quantities of triiron tetroxide, Fe3O4 and carbon.
The oxide is stable above 575°C. Thus, it can be prepared by heating iron with oxygen under appropriate pressure at 575°C. Also, iron(II) oxide has been prepared by saturating the fused triiron tetroxide with iron, powdering the mixture, followed by magnetic separation of the oxide from excess iron (Sidgwick, N.V. 1950. The Chemical Elements and Their Compounds, Vol.2, pp 1328, Oxford: Clarendon Press).
8.5 Merck
8.6 Chemical Properties
8.7 Uses
In manufacture of green, heat-absorbing glass; in steel manufacture; in enamels; as catalyst.
8.8 Usage
In manufacture of green, heat-absorbing glass; in steel manufacture; and as a catalystIron(II) oxide is used in manufacturing of green, heat-absorbing glass; in steel manufacture; and as a catalyst. It is used as a dye or pigment in pottery, glazes and glasses. It finds application as heat-absorbing glass used in buildings and automobiles. It is used as a precursor in the production of steel. It is also used in cosmetics and some tattoo inks. It can also be used for filtering phosphates from home aquaria and acts as a catalyst in a number of industrial and chemical operations.
9. Computational chemical data
  • Molecular Weight: 71.844g/mol
  • Molecular Formula: FeO
  • Compound Is Canonicalized: True
  • XLogP3-AA: null
  • Exact Mass: 71.929850
  • Monoisotopic Mass: 71.929850
  • Complexity: 2
  • Rotatable Bond Count: 0
  • Hydrogen Bond Donor Count: 0
  • Hydrogen Bond Acceptor Count: 1
  • Topological Polar Surface Area: 17.1
  • Heavy Atom Count: 2
  • Defined Atom Stereocenter Count: 0
  • Undefined Atom Stereocenter Count: 0
  • Defined Bond Stereocenter Count: 0
  • Undefined Bond Stereocenter Count: 0
  • Isotope Atom Count: 0
  • Covalently-Bonded Unit Count: 1
10. Question & Answer
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