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Periodic Table/Compounds/Iron trioxide

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© Melvin Olsson 2025–2026
Data: IAEA & PubChem

Iron trioxide

Fe₂O₃·159.690 g/mol·CID 518696

IUPAC: oxo(oxoferriooxy)iron

Also known as: Iron oxide, red, iron(3+) oxide, Anhydrous Ferric Oxide, Anhydrous Iron (III) Oxide, CHEBI:50819 (+14 more)

2D structure of Iron trioxide

Molecular Structure

Molecular Propertiesmass · H-bonds · stereo

Molecular Weight

159.690g/mol

Exact Mass

159.854615Da

Monoisotopic Mass

159.854615Da

XLogP

—

Polar Surface Area

43.4Ų

Complexity

34

Formal Charge

0

H-Bond Donors

0

H-Bond Acceptors

3

Rotatable Bonds

0

Heavy Atoms

5

Stereo Centers

0

Bond Stereo

0

Drug-Likeness (Lipinski's Rule of Five)

✓ 159.7 g/mol
MW ≤ 500
? —
LogP ≤ 5
✓ 0
H-bond donors ≤ 5
✓ 3
H-bond acceptors ≤ 10

Passes all rules — good oral bioavailability predicted

GHS Hazard Classification

Danger
Irritant
Irritant
Environmental Hazard
Environmental Hazard
Health Hazard
Health Hazard
Corrosive
Corrosive
Hazards
  • H319Causes serious eye irritation
  • H411Toxic to aquatic life with long lasting effects
  • H370Causes damage to organs
  • H372Causes damage to organs through prolonged or repeated exposure
  • H315Causes skin irritation
  • H318Causes serious eye damage
  • H335May cause respiratory irritation

Source: PubChem GHS Classification. Always consult the SDS for handling.

Chemical IdentifiersSMILES · InChI

InChI

InChI=1S/2Fe.3O

Isomers8 compounds with formula Fe₂O₃

2D structure of bis(iron(3+));tris(oxygen(2-))

bis(iron(3+));tris(oxygen(2-))

CID 14833 · 159.7 g/mol

2D structure of oxido(oxo)iron;oxoiron(1+)

oxido(oxo)iron;oxoiron(1+)

CID 129627673 · 159.7 g/mol

2D structure of bis(iron-59(3+));tris(oxygen(2-))

bis(iron-59(3+));tris(oxygen(2-))

CID 44144790 · 165.9 g/mol

2D structure of bis(iron(2+));tris(oxygen(2-))

bis(iron(2+));tris(oxygen(2-))

CID 131728961 · 159.7 g/mol

2D structure of bis(oxoiron(1+));oxygen(2-)

bis(oxoiron(1+));oxygen(2-)

CID 173046756 · 159.7 g/mol

2D structure of iron;iron(3+);ozone

iron;iron(3+);ozone

CID 173117558 · 159.7 g/mol

2D structure of bis(iron(3+));tris(oxygen-18(2-))

bis(iron(3+));tris(oxygen-18(2-))

CID 11600727 · 165.7 g/mol

2D structure of oxo((17O)oxoferriooxy)iron

oxo((17O)oxoferriooxy)iron

CID 71308967 · 162.7 g/mol

External Resources

PubChem ↗Wikipedia ↗